from today, the I.E.S.N. WEB SITE has moved to a different=20
server.
http://web.tiscalinet.it/iesn<=
/DIV>
(both for english and italian version)
Many pages are constructed with java appletts.
Regards
Francesco
Subject: Re: NEW SERVER FOR IESN
From: The Lahrs JohnJan@........
Date: Tue, 10 Aug 1999 07:46:08 -0600
Hi Francesco,
I tried your new page, but got this error message:
Symantec Java! ByteCode Compiler Version 210.065
Copyright (C) 1996-97 Symantec Corporation
# Applet exception: class mmfaritemmenu could not be loaded
# Applet exception: class mmfaritemmenu could not be loaded
John
At 12:35 PM 8/10/99 +0200, you wrote:
>>>>
Hi all, from today, the I.E.S.N. WEB SITE has moved to a
different server. The new address: http://web.tiscalinet.it/iesn (both
for english and italian version) Many pages are constructed with java
appletts. Regards Francesco
* John C. and Jan H. Lahr *
* JohnJan@........ *
* 1925 Foothills Road *
* Golden, Colorado 80401-1718 *
* (303) 215-9913 *
* http://lahr.org/john-jan *
* http://giseis.alaska.edu/lahr *
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: GI Joe Seismograph
From: Doug Crice dcrice@............
Date: Tue, 10 Aug 1999 08:54:57 -0700
Does anybody know anything about the GI Joe Seismograph. It's obviously
a toy, but is a functional seismograph? There's a picture on e-bay at
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&tc=ps&item=144158981
Doug
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: NEW SERVER FOR IESN
From: Doug Crice dcrice@............
Date: Tue, 10 Aug 1999 08:59:43 -0700
I got the same error message. I am using Netscape Communicator, and I
am guessing you designed the page and tested it with Internet Explorer.
Microsoft includes some commands that are not supported by other
browsers.
> Francesco wrote:
>
> Hi all,
> from today, the I.E.S.N. WEB SITE has moved to a different server.
> The new address:
>
> http://web.tiscalinet.it/iesn
> (both for english and italian version)
>
> Many pages are constructed with java appletts.
>
> Regards
> Francesco
--
Doug Crice web site http://www.georadar.com
GeoRadar Inc. e-mail dcrice@............
19623 Via Escuela Drive phone 408-867-3792
Saratoga, CA 95070 USA fax 408-867-4900
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: NEW SERVER FOR IESN
From: jmhannon@....................
Date: Tue, 10 Aug 1999 11:32:21 -0500
I tried it with both netscape and IE and got the error message
LOAD: class mmfaritemmenu not found
Jim Hannon
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: IESN WEB ERROR...
From: "Francesco" franuc@......
Date: Tue, 10 Aug 1999 19:42:37 +0200
Hi all.
The drawback has been caused by an error of the java codebase, still =
linked to the old server.
Now, all the pages work fine.
Francesco
=FF=FE<=00!=00D=00O=00C=00T=00Y=00P=00E=00 =00H=00T=00M=00L=00 =
=00P=00U=00B=00L=00I=00C=00 =
=00"=00-=00/=00/=00W=003=00C=00/=00/=00D=00T=00D=00 =00H=00T=00M=00L=00 =
=004=00.=000=00 =
=00T=00r=00a=00n=00s=00i=00t=00i=00o=00n=00a=00l=00/=00/=00E=00N=00"=00>=00=
=0D=00=0A=
=00<=00H=00T=00M=00L=00>=00<=00H=00E=00A=00D=00>=00=0D=00=0A=
=00<=00M=00E=00T=00A=00 =
=00c=00o=00n=00t=00e=00n=00t=00=3D=00"=00t=00e=00x=00t=00/=00h=00t=00m=00=
l=00;=00 =
=00c=00h=00a=00r=00s=00e=00t=00=3D=00u=00n=00i=00c=00o=00d=00e=00"=00 =
=00h=00t=00t=00p=00-=00e=00q=00u=00i=00v=00=3D=00C=00o=00n=00t=00e=00n=00=
t=00-=00T=00y=00p=00e=00>=00=0D=00=0A=
=00<=00M=00E=00T=00A=00 =
=00c=00o=00n=00t=00e=00n=00t=00=3D=00"=00M=00S=00H=00T=00M=00L=00 =
=005=00.=000=000=00.=002=000=001=004=00.=002=001=000=00"=00 =
=00n=00a=00m=00e=00=3D=00G=00E=00N=00E=00R=00A=00T=00O=00R=00>=00=0D=00=0A=
=00<=00S=00T=00Y=00L=00E=00>=00<=00/=00S=00T=00Y=00L=00E=00>=00=0D=00=0A=
=00<=00/=00H=00E=00A=00D=00>=00=0D=00=0A=
=00<=00B=00O=00D=00Y=00 =
=00b=00g=00C=00o=00l=00o=00r=00=3D=00#=00f=00f=00f=00f=00f=00f=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00H=00i=00 =
=00a=00l=00l=00.=00<=00/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00T=00h=00e=00 =
=00d=00r=00a=00w=00b=00a=00c=00k=00 =00h=00a=00s=00 =00b=00e=00e=00n=00 =
=00c=00a=00u=00s=00e=00d=00 =00b=00y=00&=00n=00b=00s=00p=00;=00a=00n=00 =
=00e=00r=00r=00o=00r=00 =00o=00f=00&=00n=00b=00s=00p=00;=00 =
=00t=00h=00e=00 =00=0D=00=0A=
=00j=00a=00v=00a=00 =00c=00o=00d=00e=00b=00a=00s=00e=00,=00 =
=00s=00t=00i=00l=00l=00 =
=00l=00i=00n=00k=00e=00d=00&=00n=00b=00s=00p=00;=00t=00o=00 =
=00t=00h=00e=00 =00o=00l=00d=00 =
=00s=00e=00r=00v=00e=00r=00.=00<=00/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00=
V=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00N=00o=00w=00,=00 =00a=00l=00l=00 =
=00t=00h=00e=00 =00p=00a=00g=00e=00s=00 =00w=00o=00r=00k=00 =
=00f=00i=00n=00e=00.=00<=00/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00V=00>=00=
=0D=00=0A=
=00<=00D=00I=00V=00>=00&=00n=00b=00s=00p=00;=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00F=00r=00a=00n=00c=00e=00s=00c=00o=00<=00=
/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00V=00>=00<=00/=00B=00O=00D=00Y=00>=
=00<=00/=00H=00T=00M=00L=00>=00=0D=00=0A=
=00
Subject: SEISMO CHAT-FORUM ON WEB SITE
From: "Francesco" franuc@......
Date: Wed, 11 Aug 1999 02:04:56 +0200
Hi all.
In the new version of IESN site, I have inserted a new page, available =
from http://web.tiscalinet.it/iesn/english.htm link > "Seismo Forum." =
This page contains a chat-forum, java based, at disposition of all the =
PSN members. =20
It doesn't intend absolutely to replace the mailng-list, but it could =
represent a new way of comunication for whoever wants to exchange =
information in real time with one or many people, especially in occasion =
of particular events, etc.etc. =20
The access is free in every moment; it is not moderated; no limit to =
users.=20
To use it, is enough to insert your own name or nick-name and join. No =
password required. =20
For the moment it is a lite and experimental version. =20
If the initiative will be pleasant and will have success, I could think =
about inserting a professional version. =20
=20
I hope that you like it. =20
=20
Larry, if you want, you can insert this page directly on the PSN site. =
I will give you the technical indications and the java source.
Francesco
Hi all.
This page contains a chat-forum, java based, at =
disposition=20
of all the PSN members.
It doesn't intend absolutely to =
replace the=20
mailng-list, but it could represent a new way of =
comunication for=20
whoever wants to exchange information in real time with one or many =
people,=20
especially in occasion of particular events, etc.etc.
The =
access is=20
free in every moment; it is not moderated; no limit to users. =
To use=20
it, is enough to insert your own name or nick-name and join. No password =
required.
For the moment it is a lite and experimental=20
version.
If the initiative will be pleasant and will have =
success, I=20
could think about inserting a professional version.
=
I hope=20
that you like it.
Larry, if you want, you can =
insert=20
this page directly on the PSN site. I will give you the technical =
indications=20
and the java source.
Francesco
Subject: SEISMO CHAT-FORUM ON WEB SITE
From: Francesco franuc@......
Date: Wed, 11 Aug 1999 02:37:54 +0200
Hi all.
In the new version of IESN site, I have inserted a new page, available from
http://web.tiscalinet.it/iesn/english.htm link > "Seismo Forum."
This page contains a chat-forum, java based, at disposition of all the PSN
members.
It doesn't intend absolutely to replace the mailng-list, but it could
represent a new way of comunication for whoever wants to exchange
information in real time with one or many people, especially in occasion of
particular events, etc.etc.
The access is free in every moment; it is not moderated; no limit to users.
To use it, is enough to insert your own name or nick-name and join. No
password required.
For the moment it is a lite and experimental version.
If the initiative will be pleasant and will have success, I could think
about inserting a professional version.
I hope that you like it.
Larry, if you want, you can insert this page directly on the PSN site. I
will give you the technical indications and the java source.
Francesco
Francesco Nucera
Osimo - Italy
Lat.43.29N Long.13.29E
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: SEISMO CHAT-FORUM ON WEB SITE
From: Francesco franuc@......
Date: Wed, 11 Aug 1999 00:37:54 +0200
Hi all.
In the new version of IESN site, I have inserted a new page, available from
http://web.tiscalinet.it/iesn/english.htm link > "Seismo Forum."
This page contains a chat-forum, java based, at disposition of all the PSN
members.
It doesn't intend absolutely to replace the mailng-list, but it could
represent a new way of comunication for whoever wants to exchange
information in real time with one or many people, especially in occasion of
particular events, etc.etc.
The access is free in every moment; it is not moderated; no limit to users.
To use it, is enough to insert your own name or nick-name and join. No
password required.
For the moment it is a lite and experimental version.
If the initiative will be pleasant and will have success, I could think
about inserting a professional version.
I hope that you like it.
Larry, if you want, you can insert this page directly on the PSN site. I
will give you the technical indications and the java source.
Francesco
Francesco Nucera
Osimo - Italy
Lat.43.29N Long.13.29E
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: ECLIPSE NOW !
From: "Giovanni Rotta" rottag@..........
Date: Wed, 11 Aug 1999 12:09:03 +0200
Beatutiful eclipse now here in Northeastern Italy !
Somebody knows something about the phenomenon named "Focault' pendulum =
?"
Giovanni
Giovanni Rotta
Via F. Pizzigoni, 10
33010 Resia (Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
Beatutiful eclipse now here in Northeastern =
Italy=20
!
Somebody knows something about the phenomenon =
named=20
"Focault' pendulum ?"
Giovanni
Giovanni Rotta
Via F. Pizzigoni, 10
33010 =
Resia=20
(Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
Subject: Re: ECLIPSE NOW !
From: aheerfor@......
Date: Wed, 11 Aug 1999 12:54:36 +0200
Well, there is eclipe here, too at 56 degrees latitude. It's rather dark.
I have set up a Foucault's pendulum, and I am currently taking
measurements, so yes, I suppose I know something..
Regards, Anders
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: R: ECLIPSE NOW !
From: "Giovanni Rotta" rottag@..........
Date: Wed, 11 Aug 1999 13:33:35 +0200
Hi !
I would like to know if you have recorded some variation of the trace of
your pendulum during the eclipse.
Thank you !
Giovanni
----- Original Message -----
From:
To: PSN-L Mailing List
Sent: Wednesday, August 11, 1999 12:54 PM
Subject: Re: ECLIPSE NOW !
> Well, there is eclipe here, too at 56 degrees latitude. It's rather dark.
>
> I have set up a Foucault's pendulum, and I am currently taking
> measurements, so yes, I suppose I know something..
>
> Regards, Anders
>
>
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: R: ECLIPSE NOW !
From: aheerfor@......
Date: Wed, 11 Aug 1999 13:59:38 +0200
>
Hi !
I would like to know if you have recorded some variation of the trace of
your pendulum during the eclipse.
Thank you !
Giovanni
<
Hmm, yes I have. Before the eclipse the rotation of the azimut seemed to
have a fixed rate.
During the eclipse, this rate seemed to be near zero.
However, I am not very happy about the accuracy of my measurements. One
should really spend months on this experiment and considerable money to
perfect the measurements, and not a few hours, as I have done. One should
not place too much trust in my measurements.
If anything, these experiments gives you a healthy respect for the effect
of hinges and suspensions on pendulums, which can be transferred to
seismometers. It is very diffucult to make a perfect suspension, and I wont
claim that I succeeded in this.
Regards, Anders
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Help requested!
From: Edward Cranswick cranswick@........
Date: Wed, 11 Aug 1999 14:53:17 -0600
Claud Lowe-
There is an international organization of amateur seismologists, Public
Seismic Network (PSN), who build and operate their own seismographs and exhange
data and communicate with one another via the Internet. The best way to become
familiar with the PSN is to check out the website .
There are six PSN stations in Texas at present, and you can look at some of
those sites on the map of worldwide PSN locations
. I have forwarded this email to the PSN
listserver (PSN-L), and you also could sign up with PSN-L (see directions at
). If you have any other questions, please
contact me.
Good luck!
-Edward
Tony Crone wrote:
> Hi Ed,
>
> I'm just back from being out of the office for a couple of weeks and I just
> received this message from the staff in our Albuquerque office. Below is a
> message from a private citizen who is interested in seismology and
> monitoring activity. I thought that you might be the appropriate person to
> resond to Mr. Lowe because of your experience with the PSN. I don't know
> of any formal organization, but I thought that you might. Could you please
> send an e-mail to Mr. Lowe?
>
> Thanks,
> Tony
> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
> >X-Sender: jackie@...............
> >Date: Wed, 28 Jul 1999 13:53:15 -0500
> >To: acrone@......................
> >From: Jackie Savage
> >Subject: Help requested!
> >
> >Tony--
> >
> >We recently received the following message via our website, and are
> >wondering if you (or anyone else there) know of any such amateur
> >organization:
> >--------------------------------------------------------------------
> >From: "johnw"
> >To: "usgs.asl"
> >Subject: Amateurs
> >Date: Sun, 25 Jul 1999 08:14:45 -0500
> >
> >Can you please tell me if there is a program for amateur
> >monitors and if so, what equipment and/or other items are
> >needed to be a part of it.
> >
> >I monitor NEIC daily and am very interested in Seismology
> >though I do not have a college degree. Any information would
> >be most helpful. I am in contact with another person near my
> >home and it would be helpful to him to have someone to compare
> >notes with.
> >
> >Sincerely,
> >
> >Claud Lowe
> >1322 Rock Island #21
> >Irving, TX 75060
> >(972) 870-1356
> >
>
> ************************************
> Anthony J. Crone
> Geologic Hazards Team
> Research Geologist
> U.S. Geological Survey
> MS 966, Box 25046
> Denver, Colorado 80225-0046 U.S.A.
> ------------------------------------
> /\ phone: (303) 273-8591
> /\ /\/^^\/\ FAX: (303) 273-8600
> /^^\/ /^^^/^^\/\ e-mail: crone@...................
> / / /^^^/^^^/ \
> *************************************
--
Edward Cranswick Tel: 303-273-8609
US Geological Survey, MS 966 Fax: 303-273-8600
PO Box 25046, Federal Center cranswick@........
Denver, CO 80225-0046 USA E.M. Forster said, "Only connect".
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: SEISMO CHAT-FORUM ON WEB SITE
From: Arie Verveer ajbv@............
Date: Thu, 12 Aug 1999 08:39:07 +0800
Hi Francesco, Using Netscape 4.6, I received this error message.
Applet GUIClient Class GUIClient could not be loaded.
Sounds like the same problem as suggested in Doug Crice message
from a few days ago. Microsoft / Netscape browser compatibility
problem. Sounds like fun.
-Arie
Francesco wrote:
> Hi all.
> In the new version of IESN site, I have inserted a new page, available from
> http://web.tiscalinet.it/iesn/english.htm link > "Seismo Forum."
>
> This page contains a chat-forum, java based, at disposition of all the PSN
> members.
> It doesn't intend absolutely to replace the mailng-list, but it could
> represent a new way of comunication for whoever wants to exchange
> information in real time with one or many people, especially in occasion of
> particular events, etc.etc.
> The access is free in every moment; it is not moderated; no limit to users.
> To use it, is enough to insert your own name or nick-name and join. No
> password required.
> For the moment it is a lite and experimental version.
> If the initiative will be pleasant and will have success, I could think
> about inserting a professional version.
>
> I hope that you like it.
>
> Larry, if you want, you can insert this page directly on the PSN site. I
> will give you the technical indications and the java source.
>
> Francesco
> Francesco Nucera
> Osimo - Italy
>
> Lat.43.29N Long.13.29E
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: R: SEISMO CHAT-FORUM ON WEB SITE
From: "Francesco" franuc@......
Date: Thu, 12 Aug 1999 03:06:25 +0200
Arie,
sorry, but I don't know which is the real problem.
I use Explorer 5 and all works fine (now also). The same for other =
people that use a slower version (>4.0), however with java extension or =
plugin.
The GUIClient.Class don't runs on my server, but in the Multicity.com =
one.=20
Perhaps, when you connected on the chat page, the server was down...
Please, try again, and push the reload button.
I'm waiting your response.
Bye
Francesco
=FF=FE<=00!=00D=00O=00C=00T=00Y=00P=00E=00 =00H=00T=00M=00L=00 =
=00P=00U=00B=00L=00I=00C=00 =
=00"=00-=00/=00/=00W=003=00C=00/=00/=00D=00T=00D=00 =00H=00T=00M=00L=00 =
=004=00.=000=00 =
=00T=00r=00a=00n=00s=00i=00t=00i=00o=00n=00a=00l=00/=00/=00E=00N=00"=00>=00=
=0D=00=0A=
=00<=00H=00T=00M=00L=00>=00<=00H=00E=00A=00D=00>=00=0D=00=0A=
=00<=00M=00E=00T=00A=00 =
=00c=00o=00n=00t=00e=00n=00t=00=3D=00"=00t=00e=00x=00t=00/=00h=00t=00m=00=
l=00;=00 =
=00c=00h=00a=00r=00s=00e=00t=00=3D=00u=00n=00i=00c=00o=00d=00e=00"=00 =
=00h=00t=00t=00p=00-=00e=00q=00u=00i=00v=00=3D=00C=00o=00n=00t=00e=00n=00=
t=00-=00T=00y=00p=00e=00>=00=0D=00=0A=
=00<=00M=00E=00T=00A=00 =
=00c=00o=00n=00t=00e=00n=00t=00=3D=00"=00M=00S=00H=00T=00M=00L=00 =
=005=00.=000=000=00.=002=003=001=004=00.=001=000=000=000=00"=00 =
=00n=00a=00m=00e=00=3D=00G=00E=00N=00E=00R=00A=00T=00O=00R=00>=00=0D=00=0A=
=00<=00S=00T=00Y=00L=00E=00>=00<=00/=00S=00T=00Y=00L=00E=00>=00=0D=00=0A=
=00<=00/=00H=00E=00A=00D=00>=00=0D=00=0A=
=00<=00B=00O=00D=00Y=00 =
=00b=00g=00C=00o=00l=00o=00r=00=3D=00#=00f=00f=00f=00f=00f=00f=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00A=00r=00i=00e=00,=00<=00/=00F=00O=00N=00=
T=00>=00<=00/=00D=00I=00V=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00s=00o=00r=00r=00y=00,=00 =
=00b=00u=00t=00 =00I=00 =00d=00o=00n=00'=00t=00 =00k=00n=00o=00w=00 =
=00w=00h=00i=00c=00h=00 =00i=00s=00 =00t=00h=00e=00 =00r=00e=00a=00l=00 =
=00=0D=00=0A=
=00p=00r=00o=00b=00l=00e=00m=00.=00<=00/=00F=00O=00N=00T=00>=00<=00/=00D=00=
I=00V=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00I=00 =00u=00s=00e=00 =
=00E=00x=00p=00l=00o=00r=00e=00r=00 =005=00 =00a=00n=00d=00 =
=00a=00l=00l=00 =00w=00o=00r=00k=00s=00 =00f=00i=00n=00e=00 =
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=00v=00e=00r=00s=00i=00o=00n=00 =
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D=00I=00V=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00&=00n=00b=00s=00p=00;=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
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/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00V=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00&=00n=00b=00s=00p=00;=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00&=00n=00b=00s=00p=00;=00<=00/=00D=00I=00V=00>=00<=00=
/=00B=00O=00D=00Y=00>=00<=00/=00H=00T=00M=00L=00>=00=0D=00=0A=
=00
Subject: Re: R: SEISMO CHAT-FORUM ON WEB SITE
From: Greg ghost@.............
Date: Wed, 11 Aug 1999 19:42:39 -0700
Francesco wrote:
=20
> =FF=FE<
How does that y-p-< thing translate to English?
It's not the first time I've seen it. That's why I asked.
,Greg
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject:
From: Francesco franuc@......
Date: Thu, 12 Aug 1999 08:59:19 +0200
Arie,
sorry, but I don't know which is the real problem.
I use Explorer 5 and all works fine (now also). The same for other people
that use a slower version (>4.0), however with java extension or plugin.
The GUIClient.Class don't runs on my server, but in the Multicity.com one.
Perhaps, when you connected on the chat page, the server was down...
Please, try again, and push the reload button.
I'm waiting your response.
Bye
Francesco
Francesco Nucera
Osimo - Italy
Lat.43.29N Long.13.29E
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Geophone group buy?
From: Larry Cochrane cochrane@..............
Date: Thu, 12 Aug 1999 00:41:30 -0700
Hi All,
I have been working with a new PSN member who would like to set up his own
station. He lives here in N. California. Too start with he is only
interested in local events. Since he doesn't have the time to build his own
senor, I offered to look for a geophone for him. I have contacted R.T.
Clark and Mitcham Industries for quotes for a 1 hz or 4.5 hz geophone. R.T
Clark is offering the following:
Mark products L-4C, 1 hz seismometer $375.00
Connecting cable $75.00
(the connecting cable cost is a little high in my opinion )
and Jim at Mitcham Industries sent me this:
------
I'll take $300.00 for a 1 Hz phone. $55.00 for a single 4.5 Hz.
It's hard for me to sell these one at a time. You can have 10 of the 4.5's
for $375.00. Or 5 ea. 4.5's and one 1 Hz for $475.00.
The 1 Hz is Geospace HS-10-1 single vertical geophone in aluminum case and
no spike (smooth bottom) with coil position indicator. It has about a 2
meter lead with alligator clip connectors. It weighs about 9 pounds.
The 4.5 Hz is Mark Products L10B single vertical geophone in aluminum case
with 2 3/4 inch spike,3 foot lead and Amphib IV connector. They have a
shunt resistor soldered across them for approximately 60% damping.
------
Jim at Mitcham Industries has contacted me before about having to sell one
unit at a time too our members. Since I don't have the free $$$ to stock
sensors, I offered to see if we could get together a group buy.
So I have a few questions...
1: Is there much difference between L-4C and the HS-10-1 and would the
extra 75.00 be worth the money?
2: Anyone interested in a group buy?
3: Does anyone have a sensor, or a source for a sensor, that Doug (the
person I'm working with) could buy?
Thanks,
-Larry Cochrane
Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Seismo chat
From: Arie Verveer ajbv@............
Date: Thu, 12 Aug 1999 16:02:52 +0800
Hi Francesco, I tried the reload button but the got same problem. I do get the page hit number
at
the bottom of the page. I think there is a upgrade to netscape 4.6, (4.6.1?), I will load this
tonight
and see what happens. Regards.
Arie.
Francesco wrote:
> Arie,
> sorry, but I don't know which is the real problem.
> I use Explorer 5 and all works fine (now also). The same for other people
> that use a slower version (>4.0), however with java extension or plugin.
> The GUIClient.Class don't runs on my server, but in the Multicity.com one.
> Perhaps, when you connected on the chat page, the server was down...
> Please, try again, and push the reload button.
>
> I'm waiting your response.
>
> Bye
> Francesco
>
> Francesco Nucera
> Osimo - Italy
>
> Lat.43.29N Long.13.29E
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Non-linear amplifiers
From: George Harris gjharris@.............
Date: Wed, 11 Aug 1999 19:23:25 -0400
Regarding the discussion of the use of non-linear amplifiers for
compression of seismic output.
I have tried a circuit which uses a feed-back amplifier with multiple
diodes and resistors in the feedback path. If germanium diodes are
used, the output can be switched smoothly at each .5 volt point to any
gain desired. It can be used for both posative and negative signals.
In a feedback instrument this cannot be in the feedback to the
instrument, otherwise the system stability is affected. It must be in a
separate output channel.
The circuit is any opamp with the primary feedback resistor having
direct connection and chosen to give the sensitivity needed for small
signals. In parallel with this is a pair of diodes in parallel back to
back which are in series with a smaller resistor. This smaller resistor
defines a smaller gain when the diodes conduct in either direction. The
diode pairs can be continued with ever smaller resistors to define other
switching points and scale factors. The output is a smooth curve in
both polarities.
The probem is that the diode resistance change is not sharp, so that the
output curves must be converted by use of a curve approximation in a
calculation or table look-up if precision is desired.
Has anyone tried something similar?
George Harris
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Geophone group buy?
From: Terence Dowling dowling@.........
Date: Thu, 12 Aug 1999 13:49:46 -0700
I've been on vacation so I hope it isn't too late to
respond.
I'd be interested io particpiating in a group purchase.
I've been too busy (or lazy) to build my own device.
I'm more interested in the 1hz device, but if the group
wants 4.5hz I'm still interested.
Terry
Larry Cochrane wrote:
>
> Hi All,
>
> I have been working with a new PSN member who would like to set up his own
> station. He lives here in N. California. Too start with he is only
> interested in local events. Since he doesn't have the time to build his own
> senor, I offered to look for a geophone for him. I have contacted R.T.
> Clark and Mitcham Industries for quotes for a 1 hz or 4.5 hz geophone. R.T
> Clark is offering the following:
>
> Mark products L-4C, 1 hz seismometer $375.00
> Connecting cable $75.00
> (the connecting cable cost is a little high in my opinion )
>
> and Jim at Mitcham Industries sent me this:
> ------
> I'll take $300.00 for a 1 Hz phone. $55.00 for a single 4.5 Hz.
>
> It's hard for me to sell these one at a time. You can have 10 of the 4.5's
> for $375.00. Or 5 ea. 4.5's and one 1 Hz for $475.00.
>
> The 1 Hz is Geospace HS-10-1 single vertical geophone in aluminum case and
> no spike (smooth bottom) with coil position indicator. It has about a 2
> meter lead with alligator clip connectors. It weighs about 9 pounds.
>
> The 4.5 Hz is Mark Products L10B single vertical geophone in aluminum case
> with 2 3/4 inch spike,3 foot lead and Amphib IV connector. They have a
> shunt resistor soldered across them for approximately 60% damping.
> ------
>
> Jim at Mitcham Industries has contacted me before about having to sell one
> unit at a time too our members. Since I don't have the free $$$ to stock
> sensors, I offered to see if we could get together a group buy.
>
> So I have a few questions...
>
> 1: Is there much difference between L-4C and the HS-10-1 and would the
> extra 75.00 be worth the money?
>
> 2: Anyone interested in a group buy?
>
> 3: Does anyone have a sensor, or a source for a sensor, that Doug (the
> person I'm working with) could buy?
>
> Thanks,
>
> -Larry Cochrane
> Redwood City, PSN
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Terence Dowling (408) 536-3856
Adobe Systems Inc. dowling@.........
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Non-linear amplifiers
From: Michael Chang pya_cha@..................
Date: Thu, 12 Aug 1999 17:27:13 -0700
I have a circuit which converts it's input to the log of it's bipolar peak.
It uses Vbe matched small signal transistors, thermally bonded, as the
logging element. If kept within a thermal cocoon, it can exhibit an
accuracy of within 1dB over an 80dB range. This was something I built long
ago as a noise meter without range switching; the meter face spans an 80dB
range which can be switched to give RMS, peak, or average responding.
I can prepare a schematic if anyone's interested.
Michael
At 07:23 PM 8/11/99 -0400, you wrote:
>Regarding the discussion of the use of non-linear amplifiers for
>compression of seismic output.
>
>I have tried a circuit which uses a feed-back amplifier with multiple
>diodes and resistors in the feedback path. If germanium diodes are
>used, the output can be switched smoothly at each .5 volt point to any
>gain desired. It can be used for both posative and negative signals.
>In a feedback instrument this cannot be in the feedback to the
>instrument, otherwise the system stability is affected. It must be in a
>separate output channel.
>
>The circuit is any opamp with the primary feedback resistor having
>direct connection and chosen to give the sensitivity needed for small
>signals. In parallel with this is a pair of diodes in parallel back to
>back which are in series with a smaller resistor. This smaller resistor
>defines a smaller gain when the diodes conduct in either direction. The
>diode pairs can be continued with ever smaller resistors to define other
>switching points and scale factors. The output is a smooth curve in
>both polarities.
>
>The probem is that the diode resistance change is not sharp, so that the
>output curves must be converted by use of a curve approximation in a
>calculation or table look-up if precision is desired.
>
>Has anyone tried something similar?
>
>George Harris
>
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: HS-1 and L4-C
From: S-T Morrissey sean@...........
Date: Thu, 12 Aug 1999 17:31:22 -0500 (CDT)
Regarding the HS-1 compared to the L4-C:
The HS-1 is a much larger sensor, about 4" in diameter, whereas the L4-C
is 2.75" in diameter and will fit inside 3" SCH40 ABS pipe for installing
it in a borehole. Installing the HS-1 in a borehole can be difficult if
the steel outer case is not provided. 5" SCH40 ABS pipe is needed.
THe HS-1 has a period adjustment feature using an astitizing spring.
The L4-C period is not adjustable, and tends to get shorter with age,
a point to be considered in buying used ones. (have the period tested).
The period can be lengthened slightly be tilting the sensor up to 10 degrees.
Neither seis is easy to open up for adjustment, since any abuse of the
circular leaf springs will result in an unrecoverable loss of the longer
period and a trip back to the factory.
Electrically they can be equivalent if the coils are similar. THey both
have a 1kg mass and an intrinsic damping (Beta0) of around 0.27..
The cable on the L4-C connects to a 5 or 4-pin (w. or wout. cal coil)
Bendix connector in the top of the case. THe $75 cable mignt be the
"geosensor" cable with the shovel-and-rodent-resistant thick resilient
outer jacket. Belden instrumentation cable or shielded phono cable will do.
THe original cable is moulded into the top of the shell so that direct
installation under water is possible.
Most coil resistances for either seis are in the 1200 to 5500 ohm range.
I have been searching for one with a galvanometer impedance, less than
300 ohms, to use as a fedback instrument where the high resistances
will not work.
Regards,
Sean-Thomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Expiration
From: Larry Cochrane cochrane@..............
Date: Thu, 12 Aug 1999 15:44:34 -0700
Charlie,
I have a new beta release, it's available on my system at
http://www.seismicnet.com/software.html. This beta extends the time out
period to the end of the year. I hope to make a real (non-beta) 2.6 release
soon...As usual getting the documentation together is taking a longgggg
time....
-Larry Cochrane
Redwood City, PSN
At 12:55 PM 8/12/99 -0400, you wrote:
>Hello Larry,
>
>I notice I have about 3 days on your latest beta Winquake program
>before it expires. Do you have an update available?
>
>Thanks a lot,
>
>Charlie Plyler
>Elfrad Group
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: PSN - Calibrator Question
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Wed, 11 Aug 1999 20:10:00 -0400
Sean
I have been playing with the calibrator circuit that you sent and have a
few questions. First, is the "Alarm Clock In" a contact closure?
Exactly what does the output look like?
Thanks in Advance
By the way- I am planning to start machining my version of the VBB. I
have wired all my boards and need something to test on.
Rex Klopfenstein, Jr
Bowling Green, OH
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: HS-1 and L4-C
From: Greg ghost@.............
Date: Thu, 12 Aug 1999 18:47:22 -0700
S-T Morrissey wrote:
Sean-Thomas probably already knows this, but I found a couple little
things. I think I'd make a decent editor if only I knew English better.
;)
> Regarding the HS-1 compared to the L4-C:
I'm sure he/you meant HS-10-1 and not HS-1. The HS-1 is a 4.5 Hz model.
There's also a HS-10-2 for 2 Hz. Mark Products has a L-22 2 Hz model.
> Electrically they can be equivalent if the coils are similar. THey both
> have a 1kg mass and an intrinsic damping (Beta0) of around 0.27..
The mass on the LC-4 is 1 Kg, but the HS-10-1 varies between 33 and 29
oz. Both are a little less than 1 Kg.
A lot of the details for the GeoSpace geophones are online at the
GeoSpace web site. http://www.geospacecorp.com/
Sorry Sean-Thomas,
Greg
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Compression
From: barry lotz gbl@.......
Date: Thu, 12 Aug 1999 20:20:31 -0700
Speaking of log amps etc, I have successfully used an analog mux with
code. The reason I prefered this was one can set the threshold for the
gain change(up or down). I then included the gain setting as a nibble in
the data file. When I compiled the data I normalized the data to the
lowest gain. Worked well.
Barry
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: HS-1 and L4-C
From: S-T Morrissey sean@...........
Date: Fri, 13 Aug 1999 00:55:58 -0500 (CDT)
OOPS: I was quite clearly trying to answer Larrys question about the
difference between the 1-hz L4-C and the HS-10, and writing email under the
influence of a fever from the flu. I currently have 7 HS-10-1s in my lab,
and a file cabinet top covered with L4-Cs in various states of repair,
most sitting on the bottom stop with sagged suspensions or with more serious
problems, like lightning damage.. The factory calibration data on the
HS-10-1 indicate masses from about 980 to 1010 grams, which is a variant
of the tolerance of the wire size for the 4000 ohm coil.
Sorry for any confusion.
Regards,
Sean-THomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: VBB vert. w. SG sensor
From: S-T Morrissey sean@...........
Date: Sat, 14 Aug 1999 14:19:59 -0500 (CDT)
Jim,
Congratulations on building your vertical sensor. With a small
resistor (like 10 ohms) across the (speaker) coil to damp it,, it
does work nicely as a conventional moving coil sensor. If you have
something to record it on or with, it will record larger events.
But for a sensitivity to all events of interest, the VBB response
is necessary. And the VBB output signal is obtained from the
displacement detector when the triple feedback is connected.
But the displacement data can come from any type of detector,
including a capacitive detector similar to the S-G design.
I had previously thought of suggesting the use of the S-G sensor,
but hesitated to suggest it because I have no information on the
sensitivity and particularly the linearity of the S-G capacitive sensor.
There is also a question of the stability of the tuned circuits
involved, which can seriously affect the linearity. (synchronous
demodulators avoid this problem). THere is also a concern with the
physical design and the capacitive change with distance; this could
probably be improved by making the outer plates significantly larger
than the center plate. The VBB feedback, because if its broad
frequency response, does require a fairly linear displacement
response. So I don't know if the S-G sensor will work with the
triple VBB circuit, but it probably will work as for the horizontal
S-G design with Larrys' circuit.. I also think that the VRDT electronics
design will work with the capacitive sensor if the frequency is
shifted up to 100khz or more (limited by the speed of the demodulator
switch).
Other options are to get someone to make the VRDT and electronics
for you. I have been pursuing several options to make the electronics
available. BUT FIRST I have been devoting considerable effort to
tidying up all the electronics and making a truly final and detailed
version of the schematics of all the electronics. This is why I have
held the SASE envelopes until I am 99% confident that what is drawn
is what is working. Toward this end I have assembled 3 complete
multi-period school seismometers that all perform exactly the same,
even when the circuit cards are swapped around. Some simplifications
have worked out well, and the total number of amplifiers (op-amps)
is only 10, 5 of which are in the displacement detector demodulator.
I tried to update the schematics on the web site two weeks ago, but
was cut short by a lightning power surge that smoked the 5-Volt,
200-amp power supply of our main spark server, so the schematics
are still stuck in the scanner work station. (although they have since
been updated again)..
I am currently getting information on having the printed-circuit boards
laid out and printed in limited quantities. But I am still unsure as to
when these circuit cards and/or working (assembled) electronics might be
available. Maybe by Christmas?.
Regards,
Sean-THomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Looking for Sensors
From: Doug doug@.............
Date: Sat, 14 Aug 1999 12:41:17 -0700
Greetings,
I am working on setting up a PSN seismic station here in the santa cruz
mountains of northern california. It should be interesting because I am
about one mile from the san adreas fault line, just 3 miles from the
epicenter of the 89 loma prieta quake.
Larry Cochrane is putting together the interface hardware for me,
including a 3 channel amp/filter board, the SG electronics board,
radio telemetry board, GPS timing and A/D converter.
The problem I have is locating sensors. My initial interest is for
local event monitoring, so geophones are probably how I will get
started. But I am also interested in setting up other sensors like
the lehman and SG types.
I am wondering if anyone out there knows of any sources for sensors,
either geophones, lehman, or shakleford-gunderson style sensors. If
you have any of these to sell, or know someone who does, please let
me know. I am also wondering if anyone out there would be willing to
build me the lehman or SG type sensors, let me know.
BTW I have some live weather data from my location posted here:
http://sensorium.los-gatos.net/
You can get a weather station from dallas semiconductor for $80 that
includes temperature, wind speed, and wind direction. For another $50
you can add a rain guage. They also provide free source code for
these devices. See http://www.ibutton.com/weather/index.html. Here
are some other interesting weather related sensors:
http://www.ibutton.com/ibuttons/thermochron.html
http://www.pointsix.com/products/index.htm#1wireprobes
http://www.texas-weather.com
Thanks,
Doug
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: An event
From: Nick & Sophie Caporossi nickcap@.............
Date: Sat, 14 Aug 1999 17:59:49 -0400
Hi All:
Got something this morning but I can't confirm it.
It occurred at 8/14/99 at 00:36:11 UTC, 8:36PM EST (my time).
Did anyone pick up something at that time?
Don't know where to find the Location and Time for events?
The Lamont-Doherty Cooperative Seismographic Network at:
>http://www.ldeo.columbia.edu/cgi-bin/mth-cgi-bin/24hr_heli
Shows the event at about the same time as I do.
>"http://civeng.carleton.ca/cgi-bin2/quakes" Does not seem to be updating.
Anyone know where I can get an up to date listings?
Thanks
Nick
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: R: An event
From: "Francesco" franuc@......
Date: Sun, 15 Aug 1999 00:20:38 +0200
Hi Nick,
this is the event
00.35.11
Ms 6.2
Loc.: Southern Sumatera/Sonda Strait.=20
No exactly location, because the USGS quake-finger today is down...
Can you see at =
http://www-csem.bruyeres.cea.fr/cgi-bin/ALERT_all_messages.sh?1 of EMSC
or USGS Live-cam at http://aslwww.cr.usgs.gov/Seismic_Data/heli2.htm
See also my file posted this morning (for me..) on PSN-events.
Francesco, I.E.S.N. Italy
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=00
Subject: Re: VBB vert. w. SG sensor
From: RADIOTEL@.......
Date: Sat, 14 Aug 1999 22:04:38 EDT
SEAN-THOMAS, et.al
Thanks for the advice on using a 10 ohms resister for damping my new STM-8
moving coil sensor. My unit worked as soon as constructed netting me two
earthquakes the first day of operation and approximately one to three each
day there-after. And almost as rewarding my wife loves the look-she says
that it looks so professional! I am going to now do a lot of experimenting
with it, possibly purchasing one of Larry's boards next month. In the
interim, please know what a great debt we all owe you for sharing your design
and allowing us to pester you with so many questions.
Jim Allen
Cerritos, Calif.
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: An event
From: RLLaney@.......
Date: Sun, 15 Aug 1999 12:43:44 EDT
Hi Nick:
Yes, I got it here as well at 00:36:24.
Francesco, thanks for the info on the location.
Bob Laney
Herndon, VA
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Geophone group buy & Tinkering in Las Vegas...
From: jimo17@........
Date: Sun, 15 Aug 1999 19:14:00 -0700
Larry-and PSN Members (The Can-Do Folks),
I am in the process of developing seismic systems (as cheap as possible,
so I can get them in as many schools as possible) for Clark County
Schools, here in Las Vegas, which has over 200,00 students. I am
thinking along the lines of PEPP, but with a much more affordable system.
Recording at UNLV:
I recently purchased your Amp/Filter (3 Channels) and the A/D board and
hooked it up to the UNLV, 20 year old, Lehman (E-W) and 3 S-13's (X,Y,Z).
The Lehman went thru your Amp/Filter (set at 2K gain) while the S-13's
went thru a Geotech amplifier of 1K gain, and all 4 were recorded on a
Gateway PC (8Mb Ram & 400Mb HD) at 50 sps. I was able to record the
Scotty Castle sequence (M=5.7, 8/1/99), was I impressed, even the Event
Detector worked! Now, all channels went off scale on the Main Shock, it
appeared either the Amp or A/D clipped on the Lehman, while it appeared
the S-13 seismometer, it self, was saturated, as the recording was very
peculiar looking, not the normal clipping. We were 250 Km's away from
the epicenter. The Lehman also has a 10hz oscillation which is small on
the seismogram and comes out as a spike on the spexa.
Question 1. Is it likely the S-13 seismometer itself would get saturated
from this Eq ?
Question 1a. How do I tell rather the Amp or A/D board clipped?
Question 1b. Does the Lehman have another resonant frequency at 10 HZ?
Geophone Testing (L-4):
I live about 5 Km's from a recent M=2.5, May 6, which I felt. UNR has
two sites 30 Km's and 50 Km's away in opposite directions from Boulder
City, (BC), (BC is 30km's South-East of Las Vegas), UNR recorded the
M=2.5, but they need a third site to get a better location. I hope to be
that third site to pin down these small shocks which go unnoticed on
their Network, here in BC. I just started testing 3 L4's, 2 H & 1 Z,
here at my house in Boulder City, NV . I have them on my patio with 100'
of coaxial cable which came with the sensors. I borrowed them from UNLV
to determine if they would be good for detecting local EQ's. I put their
output directly into a DataQ A/D board, (DI-194, 16 bit, 4 channel, 10V
FS, sells for $100) thru the 100' cable, which hooks up externally to my
PC( HP 96 Mb Ram & 4 GB HD) thru the Com1 port. I obviously need a
preamplifier as I don't even see road traffic, they do slightly pick me
up when I walk by.
Question 2. What is the L-4 output?
Question 3. Can I use your Amp/Filt board as a Pre-amp? and do I need to
place it very close to the L4 seismometer to keep a short input cable?
Question 4. Should your Filter board setting be something like 0.5 to 30
Hz for the L4.
Question 5. I have a program, Atomic Clock, which calls Boulder or Fort
Collins, CO to reset my PC clock. I am wondering if that is
satisfactory, as my main interest is just S-P values, to locate local
Eq's.
At the present time I have the Lehman, 3 S-13's and 2 Z L-4's recording
at UNLV using your Amp/filter board on the Lehman and L-4's. I believe
you set two of the channels to 20 hz for the Geophones and 10 hz for the
Lehman.
I am ready to order another Amp/Filter board unless someone can suggest a
cheaper pre-amp.....for the L-4's.
Jim O'Donnell
Retired Geophysicist
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: More on the geophone group buy.
From: Larry Cochrane cochrane@..............
Date: Sun, 15 Aug 1999 22:50:03 -0700
All,
I contacted Jim Croix at Mitcham Industries to see how many of the 1 hz and
4.5 hz sensors he has. He has 40-50 of each type of sensor, so everyone who
contacted me can get one.
This is what I have so far for the group buy:
Who Qt Sensor Type
David Okrent 1 4.5 hz
Terence Dowling 1 1 hz
Arie Verveer 1 1 hz
Tom Frey 1 1 hz
Doug at los-gatos.net 1 1 hz
Larry Cochrane 1 1 hz
If you want to be added to the list please let me know ASAP. I will contact
Jim in a few days to get a final price for the equipment.
Regards,
Larry Cochrane
Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Geophone group buy & Tinkering in Las Vegas...
From: Larry Cochrane cochrane@..............
Date: Mon, 16 Aug 1999 00:35:00 -0700
Jim,
Thanks for your message. Answers to some of your questions below....
At 07:14 PM 8/15/99 -0700, you wrote:
>Larry-and PSN Members (The Can-Do Folks),
>
>I am in the process of developing seismic systems (as cheap as possible,
>so I can get them in as many schools as possible) for Clark County
>Schools, here in Las Vegas, which has over 200,00 students. I am
>thinking along the lines of PEPP, but with a much more affordable system.
>
>
>Recording at UNLV:
>I recently purchased your Amp/Filter (3 Channels) and the A/D board and
>hooked it up to the UNLV, 20 year old, Lehman (E-W) and 3 S-13's (X,Y,Z).
>The Lehman went thru your Amp/Filter (set at 2K gain) while the S-13's
>went thru a Geotech amplifier of 1K gain, and all 4 were recorded on a
>Gateway PC (8Mb Ram & 400Mb HD) at 50 sps. I was able to record the
>Scotty Castle sequence (M=5.7, 8/1/99), was I impressed, even the Event
>Detector worked! Now, all channels went off scale on the Main Shock, it
>appeared either the Amp or A/D clipped on the Lehman, while it appeared
>the S-13 seismometer, it self, was saturated, as the recording was very
>peculiar looking, not the normal clipping. We were 250 Km's away from
>the epicenter. The Lehman also has a 10hz oscillation which is small on
>the seismogram and comes out as a spike on the spexa.
>Question 1. Is it likely the S-13 seismometer itself would get saturated
>from this Eq ?
>Question 1a. How do I tell rather the Amp or A/D board clipped?
I don't think the sensor saturated. Its probably too much gain through the
system.
>Question 1b. Does the Lehman have another resonant frequency at 10 HZ?
My Lehman has several resonances. Its hard too say where they will show up.
>
> Geophone Testing (L-4):
> I live about 5 Km's from a recent M=2.5, May 6, which I felt. UNR has
>two sites 30 Km's and 50 Km's away in opposite directions from Boulder
>City, (BC), (BC is 30km's South-East of Las Vegas), UNR recorded the
>M=2.5, but they need a third site to get a better location. I hope to be
>that third site to pin down these small shocks which go unnoticed on
>their Network, here in BC. I just started testing 3 L4's, 2 H & 1 Z,
>here at my house in Boulder City, NV . I have them on my patio with 100'
>of coaxial cable which came with the sensors. I borrowed them from UNLV
>to determine if they would be good for detecting local EQ's. I put their
>output directly into a DataQ A/D board, (DI-194, 16 bit, 4 channel, 10V
>FS, sells for $100) thru the 100' cable, which hooks up externally to my
>PC( HP 96 Mb Ram & 4 GB HD) thru the Com1 port. I obviously need a
>preamplifier as I don't even see road traffic, they do slightly pick me
>up when I walk by.
>Question 2. What is the L-4 output?
Sorry, I don't know the sensitivity of this sensor.
>Question 3. Can I use your Amp/Filt board as a Pre-amp? and do I need to
>place it very close to the L4 seismometer to keep a short input cable?
If your A/D card input is from 0 to 10 vdc and not +-10 vdc there will be a
problem using my Amp card. It produces a +- output voltage.
>Question 4. Should your Filter board setting be something like 0.5 to 30
>Hz for the L4.
For geophones I have been using .5 to 20 hz, but I can make it 30 hz if
needed.
>Question 5. I have a program, Atomic Clock, which calls Boulder or Fort
>Collins, CO to reset my PC clock. I am wondering if that is
>satisfactory, as my main interest is just S-P values, to locate local
>Eq's.
Don't know.
>
>At the present time I have the Lehman, 3 S-13's and 2 Z L-4's recording
>at UNLV using your Amp/filter board on the Lehman and L-4's. I believe
>you set two of the channels to 20 hz for the Geophones and 10 hz for the
>Lehman.
Yes, this is correct.
>
>I am ready to order another Amp/Filter board unless someone can suggest a
>cheaper pre-amp.....for the L-4's.
>
>Jim O'Donnell
>Retired Geophysicist
-Larry Cochrane
Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: More on the geophone group buy.
From: jimo17@........
Date: Mon, 16 Aug 1999 06:43:11 -0700
Larry
This sounds like a good idea....
Put me down for 2 Geophones, a 1Hz and a 4.5Hz...
Thanks,
Jim O'Donnell
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: More on the geophone group buy.
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Mon, 16 Aug 1999 11:03:59 -0400
Your can put me down for qty 1 of the 1 Hz model.
Larry Cochrane wrote:
> All,
>
> I contacted Jim Croix at Mitcham Industries to see how many of the 1 hz and
> 4.5 hz sensors he has. He has 40-50 of each type of sensor, so everyone who
> contacted me can get one.
>
> This is what I have so far for the group buy:
>
> Who Qt Sensor Type
> David Okrent 1 4.5 hz
> Terence Dowling 1 1 hz
> Arie Verveer 1 1 hz
> Tom Frey 1 1 hz
> Doug at los-gatos.net 1 1 hz
> Larry Cochrane 1 1 hz
>
> If you want to be added to the list please let me know ASAP. I will contact
> Jim in a few days to get a final price for the equipment.
>
> Regards,
> Larry Cochrane
> Redwood City, PSN
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Expiration
From: Edward Cranswick cranswick@........
Date: Mon, 16 Aug 1999 10:20:08 -0600
Larry-
except the version identifies itself as 2.6.2 beta.
-Edward
Larry Cochrane wrote:
> Charlie,
>
> I have a new beta release, it's available on my system at
> http://www.seismicnet.com/software.html. This beta extends the time out
> period to the end of the year. I hope to make a real (non-beta) 2.6 release
> soon...As usual getting the documentation together is taking a longgggg
> time....
>
> -Larry Cochrane
> Redwood City, PSN
>
> At 12:55 PM 8/12/99 -0400, you wrote:
> >Hello Larry,
> >
> >I notice I have about 3 days on your latest beta Winquake program
> >before it expires. Do you have an update available?
> >
> >Thanks a lot,
> >
> >Charlie Plyler
> >Elfrad Group
> >
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Edward Cranswick Tel: 303-273-8609
US Geological Survey, MS 966 Fax: 303-273-8600
PO Box 25046, Federal Center cranswick@........
Denver, CO 80225-0046 USA E.M. Forster said, "Only connect".
_____________________________________________________________________
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Subject: Re: More on the geophone group buy.
From: Tobin Fricke tobin@.......
Date: Mon, 16 Aug 1999 13:27:24 -0700 (PDT)
This Geophone group buy sounds like a good opportunity for me to establish
a seismometer of my own.. I'm already planning on building a Lehman when I
get home (I'm in Alaska for the summer) but a geophone sounds like fun.
I live in a suburban neighborhood in Southern California, and I don't
really know anything about Geophones per se. What geophone would give me
the most earthquake-listening entertainment, and how much do they cost?
Thanks,
Tobin
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Subject: seismometer sensitivity
From: S-T Morrissey sean@...........
Date: Mon, 16 Aug 1999 17:32:23 -0500 (CDT)
Regarding the questions of the sensitivity of various seismometers,
particularly compact 1-hz and shoter period phones:
There is no unique answer to the question, since they are all
manufactured to meet a wide range of data and recording requirements.
THe big variable is the coil resistance, which is kept low (hundreds
of ohms) for galvanometric recording or long field strings, but is
made high (5500 ohms for a typical L4-C) for amplified applications
like telemetry. THe upper limit is where the resistance is so high that
the coil cannot be used for damping because it limits the current. Some
seises (long period) have a 100,000 ohm coil for the signal and a separate
500 ohm coil for damping.
The other variable has been the use of improved magnets; some manufacturers
have recently switched to niobium-based alloys, which can provide over
5x the output from the same package.
So the best bet is to get the data for EACH phone from the manufacturer.
Most provide a label with at least the coil resistance (which you can measure,
of course) and the generator constant of either the main coil or the
calibration coil. Most have tables or graphs of the output for various
coil resistances; these are accurate to about 20%. Some show the output
level at various percentages of critical damping (this is not the same
as the open-circuit output), and even give the damping resistance (which
has to be corrected for the parallel input resistance of the amplifier).
Most geophones are sealed so that directly measuring the generator constant
by a weight-lift test cannot be done. If the calibrator coil constant is
given, this can be used to determine the output of the main coil. THen
the actual input to the amplifier with the damping resistor in place can
be determined. Years ago, we calibrated 50 or so L4-Cs and found that the
nominal output (270v/m/sec for a 5500 ohm coil) varied by 20%, so we used
a series/shunt method (per. J. Eaton of the USGS) to standardize all of
them to a damping of 0.7 and an input to the amplifier of 100V/m/sec.
The subsequent shake-table calibration showed agreement within a few percent.
Obviously a shake-table provides an immediate answer to the sensitivity
question as well as the response of the amplifier and data system. But
they are rare, so weight-lift calibration can provide absolute results
IF there is access to the moving mass. Like for the HS-10-1 with the external
calibration coil and astitizing spring (to trim the period), the test
weights (100 to 500 milligrams) can be applied directly or via 45 degree
threads (the explanation is long and detailed) for a horizontal.
Then there is the further question of the sensitivity needed to detect
a given quake. Obviously, "cranking up the gain" is fun, but not if it
just amplifies the freeway 1 km away. But for example: with the L4-Cs
damped and trimmed to 100v/m/sec, we found that amplifier gains of 60
to 72 db (x1000 to x4000, depending on the site noise) were adequate to
record a Mb=2.0 at 20km in the New Madrid region. In the west (CA and NV),
site noise can be much less, but attenuation can be much more (up to 10x),
so amplifier gains of 84 db (x16,000) might be needed for the same result.
So what does this mean for YOUR geophone/damping/amplifier. If the L4-C
above had a net output of 100V/m/sec, and is amplified 1000 times,
the recorder is getting a signal of 0.1 volt/micron/sec or 0.1 millivolt/
nanometer/second.. In terms of displacement, a nm/sec is 1/(2*pi)*nanometers
at a period of one second. If your amplifier noise floor is 10mv, your
displacement noise sensitivity is 16 X 10^-9 meter for a 1-second wave.
Assuming that you can see a 1-second waveform at 10 times the noise level,
what size earthquake might be detected at this level? Using a standard
magnitude scale "Ms = logA/P + 1.66*log(distance) - 0.18", and using a
distance of 1 degree (about 100 km), and A is the amplitude in nanometers,
(10x the noise is 160 nm), we get a Ms magnitude of 2.02, which is a quake
very near the threshold of sensation. If the event is 2 degrees away, it
will be a magnitude 2.5. But say that you forget the preamp, but your
digitizer noise is only 1mv, so your detection level is 16000 nanometers
(16 microns), the quake at 1 degree will be a magnitude 4.02.
So even with a high-output sensor like the L4-C, a pre-amp is necessary.
4.5 hz phones will need up to 10x more gain, especially if the amplifier is
"countoured" to boost the 1-hz output. Last year I scanned the old pencil
drawing of the pre-amp that I use, along with a photo of it to my web site
http://www.eas.slu.edu/People/STMorrissey/index.html
...: stmmisc.html" PSN INFO ... SLU Seismic Network
I have since re-drawn it with the latest details, but it is not yet posted.
I can send the new schematic to any SASE, and if Larry wants to provide it,
I can send him the artwork (which is just that; it would probably have to
be re-drawn for a numerical control PC board shop). With a few compromises,
it should cost around $100. With micropower amplifiers, it has a current
drain of about 0.1 milliamp, so it will run for several years from a
pair of 6-volt alkaline lantern batteries.
A final curiosity regarding the data from an S-13 from a Ms5.7 at 200km
(I'm guessing the distance). Using the magnitude formula gives a value
for logA/P = 5.38, so if P = 1 second, the p-p ground amplitude is about
240043 nanometers, or about 0.24mm. The peak velocity (at 1 hz) is 1.5mm/sec.
The standard S-13 has a 3600 ohm coil with a generator constant of
629 V/M/sec. When damped critically with 6300 ohms, the output is 400V/m/sec.
or 0.4 volt/mm/sec. So a peal velocity of 1.5mm/sec. is 0.6 volts, which
will saturate any amplifier with gain much more than 10. But the seis
has an air gap length, or p-p coil movement, of 1.9 mm before it "hits
the stops".
Regards,
Sean-Thomas
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Subject: new event
From: barry lotz gbl@.......
Date: Mon, 16 Aug 1999 17:24:08 -0700
Something coming in @ around 00:16 UTC here.
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Subject: PSN - Calibration Board Question
From: "Rex Klopfenstein, Jr." rklopfen@.........
Date: Mon, 16 Aug 1999 20:32:33 -0400
Sean-
I have just finished building the calibration board you sent me. It
seems to be working OK (I haven't went through the output with a
'fine-tooth comb' yet). I have answered my previous question: the input
is a contact closure and the U12 circuit appears to be a single-shot to
reset/start counting.
I do have several questions on the function of some of the
potentiometers. I am using the part# from your drawing. I am assuming
that the 100K (R13) potentiometer adjusts the magitude of the "D/A"
counting pair? I also assume that the 5K (R23) potentiometer is used to
balance the bridge when the seismo coil is inserted. Finally, what is
the function of the 100K (R14) potentiometer?
Thanks in advance
Rex Klopfenstein, Jr.
Bowling Green, OH
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Subject: Re: new event
From: "Rex Klopfenstein, Jr." rklopfen@.........
Date: Mon, 16 Aug 1999 20:39:13 -0400
Where are you located??
barry lotz wrote:
> Something coming in @ around 00:16 UTC here.
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Rex Klopfenstein, Jr.
Bowling Green, OH
rklopfen@.........
www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: barry lotz gbl@.......
Date: Mon, 16 Aug 1999 17:45:04 -0700
About 200km east of San Francisco Ca. I looked at the live helicorder and it
looked like the largest records were from Russa or Norway.
Barry
Rex Klopfenstein, Jr. wrote:
> Where are you located??
>
> barry lotz wrote:
>
> > Something coming in @ around 00:16 UTC here.
> >
> > _____________________________________________________________________
> >
> > Public Seismic Network Mailing List (PSN-L)
> >
> > To leave this list email listserver@.............. with the body of the
> > message: leave PSN-L
>
> --
> Rex Klopfenstein, Jr.
> Bowling Green, OH
> rklopfen@.........
> www.wcnet.org/~rklopfen
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
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Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: barry lotz gbl@.......
Date: Mon, 16 Aug 1999 17:53:33 -0700
Rex
Looks like Red Puma is putting it in the area of Turkey. If it is is would
seem to be pretty large.
Barry
Rex Klopfenstein, Jr. wrote:
> Where are you located??
>
> barry lotz wrote:
>
> > Something coming in @ around 00:16 UTC here.
> >
> > _____________________________________________________________________
> >
> > Public Seismic Network Mailing List (PSN-L)
> >
> > To leave this list email listserver@.............. with the body of the
> > message: leave PSN-L
>
> --
> Rex Klopfenstein, Jr.
> Bowling Green, OH
> rklopfen@.........
> www.wcnet.org/~rklopfen
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
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Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: ACole65464@.......
Date: Mon, 16 Aug 1999 20:53:03 EDT
Hi all,
The large surface waves are really starting to roll through here in Edmonds
Washington state, 5:53PM PDT.
Allan Coleman
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: Seisguy@.......
Date: Mon, 16 Aug 1999 20:58:46 EDT
AP reports a very recent quake in Turkey, could this be the new event?
Earthquake hits Turkey, residents on the streets
ANKARA, Aug 17 (Reuters) - An earthquake shook Turkey in the early hours of
Tuesday cutting electricity and sending residents out onto the streets in the
capital Ankara and in the country's largest city Istanbul, some 440 km (275
miles) away.
``It shook the house for nearly a minute. We went down to the street straight
away,'' said Istanbul resident Veysel Karakaya. There were no immediate
reports or casualties or damage.
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: ACole65464@.......
Date: Mon, 16 Aug 1999 21:08:48 EDT
Its got to big, the remotely located 1 Hz vertical seismometers around this
state (Washington) are responding with large 20 second period waves.
Allan Coleman
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Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: meredith lamb psnseismograph52@..........
Date: Mon, 16 Aug 1999 19:09:59 +0000
SDR still smeared here after about a 1/2 hour. Long period waves.
Guess maybe upper 7's or possible ?
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: new event
From: Seisguy@.......
Date: Mon, 16 Aug 1999 21:21:13 EDT
M6.8 sound correct?
Mike
Strong Earthquake Shakes Turkey
..c The Associated Press
ISTANBUL, Turkey (AP) - A strong earthquake with a magnitude of 6.8 struck
western Turkey early Tuesday, sending people fleeing into the streets and
collapsing some buildings, a private radio said.
There were no immediate reports of casualties, private TGRT said. The radio
said the epicenter of the quake was the city of Izmit, just east of Istanbul.
AP-NY-08-16-99 2107EDT
_____________________________________________________________________
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Subject: Fwd: Strong Earthquake Shakes Turkey
From: Seisguy@.......
Date: Mon, 16 Aug 1999 21:24:15 EDT
Strong Earthquake Shakes Turkey
..c The Associated Press
ISTANBUL, Turkey (AP) - A strong earthquake with a magnitude of 6.8 struck western Turkey early Tuesday, sending people fleein
g into the streets and collapsing some buildings, a private radio said.
There were no immediate reports of casualties, private TGRT said. The radio said the epicenter of the quake was the city of Izm
it, just east of Istanbul.
The radio said some bridges and buildings collapsed and injuries were reported in Izmit, 65 miles east of Istanbul.
The quake was strongly felt in Istanbul, where there were also reports of collapsed buildings, the radio said. The quake also s
hook the capital Ankara, 270 miles to the east.
Telephone and electrical service was cut in several areas as the quake struck at 3:02 a.m. (8:02 p.m. EDT), the radio said.
AP-NY-08-16-99 2122EDT
Copyright 1999 The Associated Press. The information contained in the AP news report may not be published, broadcast, rewri
tten or otherwise distributed without prior written authority of The Associated Press.
Announcement: America Online has added Reuters newswires to News Profiles. To add Reuters articles to your daily news delivery,
go to KW: News Profiles and click on "Modify Your News Profiles." Then click "Edit" and add Reute
rs from the list on the left.
To edit your profile, go to keyword NewsProfiles.
For all of today's news, go to keyword News.
Subject: New event....
From: meredith lamb psnseismograph52@..........
Date: Mon, 16 Aug 1999 19:55:19 +0000
Wonder if it knocked out afew seismos in europe area? Am on
the seismic chat site...for awhile...
http://space.tin.it/scienza/frnucer/chatE.htm
Still getting long period waves...not quite as smeared on
the SDR as before.
Meredith Lamb
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Subject: Re: Expiration
From: Larry Cochrane cochrane@..............
Date: Mon, 16 Aug 1999 19:11:59 -0700
Edward,
Oops I forgot to increment the release number. As long as you don't get the
time out message you should be OK.
-Larry
At 10:20 AM 8/16/99 -0600, you wrote:
>Larry-
> except the version identifies itself as 2.6.2 beta.
>-Edward
>
>Larry Cochrane wrote:
>
>> Charlie,
>>
>> I have a new beta release, it's available on my system at
>> http://www.seismicnet.com/software.html. This beta extends the time out
>> period to the end of the year. I hope to make a real (non-beta) 2.6 release
>> soon...As usual getting the documentation together is taking a longgggg
>> time....
>>
>> -Larry Cochrane
>> Redwood City, PSN
>>
>> At 12:55 PM 8/12/99 -0400, you wrote:
>> >Hello Larry,
>> >
>> >I notice I have about 3 days on your latest beta Winquake program
>> >before it expires. Do you have an update available?
>> >
>> >Thanks a lot,
>> >
>> >Charlie Plyler
>> >Elfrad Group
>> >
>>
>> _____________________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email listserver@.............. with the body of the
>> message: leave PSN-L
>
>--
>Edward Cranswick Tel: 303-273-8609
>US Geological Survey, MS 966 Fax: 303-273-8600
>PO Box 25046, Federal Center cranswick@........
>Denver, CO 80225-0046 USA E.M. Forster said, "Only connect".
>
>
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: EQ MAG 7.8 TURKEY
From: The Lahrs JohnJan@........
Date: Mon, 16 Aug 1999 22:14:14 -0600
In case some on the PSN list are not aware of the NEIC's bigquake
mailing list, here is a sample of the mail that is sent out following
large earthquakes. At 7.8 we'll probably here more about the Turkey
earthquake in the news tomorrow.
This page:
http://wwwneic.cr.usgs.gov/neis/data_services/data_services.html
tells how to subscribe to the bigquake list.
John
>Return-Path:
>X-Authentication-Warning: gldmutt.cr.usgs.gov: majord set sender to
owner-bigquake@................... using -f
>Date: Tue, 17 Aug 1999 3:42:52 GMT
>From: MINSCH@................
>To: bigquake@...................
>Subject: EQ MAG 7.8 TURKEY
>Sender: owner-bigquake@...................
>Reply-To: MINSCH@................
>
> U.S. GEOLOGICAL SURVEY NATIONAL EARTHQUAKE INFORMATION CENTER
> World Data Center A for Seismology
>
> Reply to: sedas@................. (internet)
> sedas@................. (internet - alternate)
>
>The following is from the United States Geological Survey, National
>Earthquake Information Center: Preliminary hypocenter for
>earthquake of 1999 Aug 17, TURKEY: latitude 40.6 degrees north,
>longitude 29.8 degrees east, origin time 00 01 38.6 utc, depth
>shallow, magnitude 7.8 ms. There have been unconfirmed reports of
>damage and possible casualties.
>Stations used: ETER P 000616.0 ESEL P 000620.6 EROQ P 000636.7
>ETOR P 000655.7 ECRI P 000656.4 EVIA P 000704.5 ENIJ P 000706.0
>EHUE P 000706.8 ESDC P 000709.8 EBAN P 000713.6 ECOG P 000714.8
>EGUA P 000715.1 ELUQ P 000718.6 ELOJ P 000718.7 EHOR P 000723.3
>EPLA P 000723.7 EMON P 000726.7 ERUA P 000727.1 EJIF P 000729.3
>EVAL P 000735.2 STS P 000735.4 BGCA P 000847.5 LBTB P 001224.4
>BOSA P 001246.2 LBNH P 001253.3 INCN P 001257.4 LSCT P 001308.2
>SUR P 001311.7 BINY P 001314.5 COLA P 001319.4 TATO P 001323.5
>MCK P 001325.7 SSPA P 001326.1 MCWV P 001336.2 EYMN P 001336.3
>PMR P 001337.5 DIV P 001341.0 BLA P 001347.1 CEH P 001347.8
>JFWS P 001352.9 LHS P 001358.6 SIT P 001359.4 WCI P 001400.6
>MYNC P 001406.8 WVT P 001412.0 PWLA P 001416.5 OXF P 001422.0
>SFTN P 001422.0 NEW P 001424.1 DPW P 001427.6 STEW P 001433.6
>OCWA P 001434.4 RMW P 001434.9 CBKS P 001435.0 REDW P 001435.4
>HAWA P 001435.4 HAYW P 001435.9 LNOR P 001436.1 LON P 001438.0
>ISCO P 001440.7 HLID P 001441.2 HWUT P 001444.2 BDFB P 001446.0
>DAU P 001449.7 DUG P 001450.7 WVOR P 001451.5 PV08 P 001452.0
>PV09 P 001452.3 PV10 P 001455.0 MSU P 001459.1 BMN P 001500.0
>YBH P 001500.6 WDC P 001505.4 MNV P 001509.0 TPH P 001509.3
>OHCM P 001510.3 TPNV P 001513.3 CMB P 001513.5 MTUM P 001514.1
>LTX P 001516.4 DAC P 001517.9 TUC P 001520.4 PFO P 001526.9
>PLCA P 002033.0 CTAO P 002034.4
>--------------------------------------------------------------------------
>To unsubscribe from this email list send mail to:
>majordomo@...................
>and put
>unsubscribe bigquake
>in the body of the message.
>Please leave the subject line blank when unsubscribing.
>*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
>SPECIAL NOTICE: The USGS is holding an Open House on August 27 & 28, 1999.
>See: http://openhouse.cr.usgs.gov/ for all of the details.
>--------------------------------------------------------------------------
>
>
John C. Lahr
POB 1529
Golden, CO 80402
(303) 215-9913
http://lahr.org/john-jan
I am only one, But still I am one.
I cannot do everything, and because I cannot
do everything, I will not refuse
to do the something that I can do.
Edward Everette Hale
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Subject: Turkey quake
From: meredith lamb psnseismograph52@..........
Date: Mon, 16 Aug 1999 22:15:28 +0000
Tv news says N.W. Turkey, 7.1 mag, near a town call Islik (spelling).
No news on NEIC or RedPuma on internet yet.
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Geophones
From: aheerfor@......
Date: Tue, 17 Aug 1999 07:46:20 +0200
I am using some geophones to record strange ground vibrations which make a
up a local hum phenomenon like the Taos Hum in the US.
The recordings point toward a technical origin at a depth of 100 meters,
possibly secret tunnels.
But I have a practical problem: The stiff black geophone cabling is
difficult to connect to my recording equipment. I have used XLR connectors,
but when handling the cabling, the connectors sometimes break loose. The
soldering is stressed, and it eventually breaks up. This is causing some
failed recordings.
How do you most easily make reliable connections?
I have heard that geophones sometimes come with special connectors for
seismic equipment, but I have never seen these connectors, and they may
even be hard to find on the market. Perhaps these connectors are ideal; I
don't know.
Any opinions?
Regards, Anders Heerfordt, Denmark
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: TURKEY MONSTER QUAKE
From: "Francesco" franuc@......
Date: Tue, 17 Aug 1999 11:26:37 +0200
Hi to all,
we have not posted the files yet, because the Italian isp, this night =
was disable........sorry.....
Now, I'm preparing a special page in the web, with all information about =
the disaster. I will put in the most significant waveform of the PSN =
member.
Thank for the help.
When the page is pubblicated I will notice to you.
Francesco. IESN Italy
p.s.: in some southern region of Italy the event is felt very well
Hi to all,
we have not posted the files yet, because the Italian isp, this =
night was=20
disable........sorry.....
Now, I'm preparing a special page in the web, with all information =
about=20
the disaster. I will put in the most significant waveform of the PSN=20
member.
Thank for the help.
When the page is pubblicated I will notice to you.
Francesco. IESN Italy
p.s.: in some southern region of Italy the event is felt very=20
well
Subject: TURKEY SPECIAL PAGE
From: "Francesco" franuc@......
Date: Tue, 17 Aug 1999 13:08:36 +0200
Hi all,
It's on line the Turkey special page at =
http://web.tiscalinet.it/iesn/turkey.htm
I'm waiting other file from PSN members to insert in.
This page is under updating.
Regards
Francesco
Hi all,
I'm waiting other file from PSN members to insert in.
This page is under updating.
Regards
Francesco
Subject: Re: TURKEY PAGE + Seismo Chat
From: Arie Verveer ajbv@............
Date: Tue, 17 Aug 1999 20:47:20 +0800
Hi Francesco, Impressive response time with your report on the Turkey earthquake.
It always distressing to hear that people died in these quakes.
I should post my results, tomorrow. I had the day off from work were my
seismograph is located. Though my automatic event mailer did e-mail me
the recordings on the surface waves. Its a little program that e-mails me any
event data that Larry's "SDR" program records. I need to do some more
work on the program code but when its finished it should allow me to receive
events while I'm on holiday. The data is sent on the hour if it exits.
By the way, the seismo chat line now works with netscape 4.6. ?
Arie
_____________________________________________________________________
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Subject: Re: Geophones
From: Doug Crice dcrice@............
Date: Tue, 17 Aug 1999 07:39:41 -0700
Anders,
Actually, the problem is not the black cable, which is a polyurethane
jacket. The conductors themselves are made of "copperweld", which is an
alloy of (I believe) steel and copper. The wire is much stronger and
stiffer than normal copper wire. Both materials are chosen so that
geophones can be used in the field handled by "juggies", folks not known
to be gentle with seismic hardware. I watched a crew routinely toss
geophones over the side of a stake truck onto concrete in downtown Los
Angeles. A Sensor engineer once told me his geophones were designed to
be dropped 50 feet from a helicopter.
Geophone connectors are available, but the main problems they address
are dirt and moisture, along with the aforementioned ruggedness issue.
You can buy them from OYO Geospace or the Sensor Division of Input
Output in Holland, but their distribution system is not geared to tiny
orders.
Anyway, because the wire is stiff, I would guess that flexing is
breaking your solder bond. You need to use a connector with a rigid
cable clamp so flexing of the wire doesn't translate down to the solder
joint. Alternately, you can probably open up the geophones and
substitute ordinary wire on that end. Be sure and observe the subtle
polarity marks. For a quick and dirty solution, just splice some
standard copper wire onto the geophone cable using one of those
cylindrical wire splices. Because the copper wire will flex, that will
relieve the stress on the joint. A crimp splice is more vibration
resistant than a solder splice.
Doug
aheerfor@...... wrote:
>
> I am using some geophones to record strange ground vibrations which make a
> up a local hum phenomenon like the Taos Hum in the US.
>
> The recordings point toward a technical origin at a depth of 100 meters,
> possibly secret tunnels.
>
> But I have a practical problem: The stiff black geophone cabling is
> difficult to connect to my recording equipment. I have used XLR connectors,
> but when handling the cabling, the connectors sometimes break loose. The
> soldering is stressed, and it eventually breaks up. This is causing some
> failed recordings.
>
> How do you most easily make reliable connections?
>
> I have heard that geophones sometimes come with special connectors for
> seismic equipment, but I have never seen these connectors, and they may
> even be hard to find on the market. Perhaps these connectors are ideal; I
> don't know.
>
> Any opinions?
>
> Regards, Anders Heerfordt, Denmark
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Doug Crice web site http://www.georadar.com
GeoRadar Inc. e-mail dcrice@............
19623 Via Escuela Drive phone 408-867-3792
Saratoga, CA 95070 USA fax 408-867-4900
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Geophones
From: jmhannon@....................
Date: Tue, 17 Aug 1999 10:03:02 -0500
Copperweld is copper clad steel piano wire, really nasty stuff. The crimp
connection Doug reccoments is the best way to go.
Jim Hannon
Doug Crice on 08/17/99 09:39:41 AM
Please respond to PSN-L Mailing List
To: PSN-L Mailing List
cc:
Subject: Re: Geophones
Anders,
Actually, the problem is not the black cable, which is a polyurethane
jacket. The conductors themselves are made of "copperweld", which is an
alloy of (I believe) steel and copper. The wire is much stronger and
stiffer than normal copper wire.
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: TURKEY SPECIAL PAGE
From: Edward Cranswick cranswick@........
Date: Tue, 17 Aug 1999 09:44:33 -0600
Francesco-
Excellent response!
-Edward
Francesco wrote:
> Hi all,It's on line the Turkey special page at
> http://web.tiscalinet.it/iesn/turkey.htm I'm waiting other file from
> PSN members to insert in. This page is under
> updating. RegardsFrancesco
--
Edward Cranswick Tel: 303-273-8609
US Geological Survey, MS 966 Fax: 303-273-8600
PO Box 25046, Federal Center cranswick@........
Denver, CO 80225-0046 USA E.M. Forster said, "Only connect".
Francesco-
Excellent response!
-Edward
Francesco wrote:
Hi all,It's on line the Turkey special
page at http://web.tiscalinet.it/iesn/turkey.htm I'm
waiting other file from PSN members to insert in. This page is under
updating. RegardsFrancesco
--
Edward Cranswick
Tel: 303-273-8609
US Geological Survey, MS 966 Fax: 303-273-8600
PO Box 25046, Federal Center cranswick@........
Denver, CO 80225-0046 USA E.M.
Forster said, "Only connect".
Subject: Some notes to pass along...
From: meredith lamb psnseismograph52@..........
Date: Tue, 17 Aug 1999 12:00:48 +0000
Hi all,
1. Apparently the Radio Shack DX-375 receiver is on sale
this month. Regular price $99.00. On sale for $69.00 till
August 28. Used for SDR card time.
2. Nuts & Volts magazine for July and August, Open Channel
by Joseph J. Carr, has "Notes on Vibration Dectectors and
Seismomgraphs - Part I and II. General article...not sure its
worth buying...but Part II mentions the Lehman seismo.
The article mentions sensors; and has acouple errors (like
mounting the magnet on the boom)....but,..... Usually shows
up on racks in some electronic wholesalers/retailers/electronic
surplus outlets.
Meredith Lamb
..
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: 1999 USGS Open House notes
From: meredith lamb psnseismograph52@..........
Date: Tue, 17 Aug 1999 12:30:38 +0000
> >SPECIAL NOTICE: The USGS is holding an Open House on August 27 & 28, 1999.
> >See: http://openhouse.cr.usgs.gov/ for all of the details.
> >--------------------------------------------------------------------------
> >
> >
> John C. Lahr
> POB 1529
> Golden, CO 80402
> (303) 215-9913
> http://lahr.org/john-jan
>
> I am only one, But still I am one.
> I cannot do everything, and because I cannot
> do everything, I will not refuse
> to do the something that I can do.
> Edward Everette Hale
>
>
The above reference by John Lahr, looks like a huge effort to
acknowledge 150 years of the USGS.
The August 27th Federal center is open mainly for school tours.
The August 28th (Saturday) Federal Center exhibits is open to
the general public. The website shows some SEVEN pages of
exhibits at: http://openhouse.cr.usgs.gov/exhibits.html Check
the site for maps, exhibits and notes.
The August 28th USGS Open House in Golden is unique in that
normally, it isn't open on Saturdays. I plan to see the National
Geomagnetic Information Center...have never seen that. They
removed the general exhibit in May for air conditioning work,
and we'll see if its the same, or add on's have been made now.
See: http://openhouse.cr.usgs.gov/golden.html
Am planning on taking the digital camera along....perhaps leading
to another series of web site references to pass some along.
This looks like a very MASSIVE number of exhibits to see.
The Golden and Federal Center sites are perhaps acouple miles
apart. If you can come....it promises to be very unique.
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: PSN - Turkey
From: "Rex Klopfenstein, Jr." rklopfen@.........
Date: Tue, 17 Aug 1999 17:22:15 -0400
I have just posted my recording of the 00:01:38 quake in Turkey and
uploaded to my website.
I now am trying to come up with a scheme to calibrate my S-G's. I have
been reading the "Manual of Seismological Observatory Practice" to get
some ideas. I am going to write a procedure and post for better ideas.
--
Rex Klopfenstein, Jr.
Bowling Green, OH
rklopfen@.........
www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Northern Cal event
From: Larry Cochrane cochrane@..............
Date: Tue, 17 Aug 1999 18:14:48 -0700
All,
While watching a news report on the terrible Turkey event we can a moderate
local event. Heres the preliminary info
99/08/18 01:06:18 37.91N 122.69W 6.9 5.0Ml B* 0 mi SSW of Bolinas, CA
The event was felt here in Redwood City.
-Larry Cochrane
Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Northern Cal event
From: fred@............ (Fred Bruenjes)
Date: Tue, 17 Aug 1999 18:39:54 -0700 (PDT)
>While watching a news report on the terrible Turkey event we can a moderate
>local event.
Felt it from my hotel room in San Jose - that was really wierd, I was also
watching news on the 7.8 when my chair began wiggling! Lasted only a few
seconds, and it wasn't enough to make me run for cover, but it definitely
got my attention!
Of course, my seismometer was turned off for this trip, so now I've missed
both this and the Turkey quake. Bummer!
Fred Bruenjes
PSN Station #2 (Ramona, CA)
--------------------------------------
Fred Bruenjes http://www.moonglow.net
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Public Seismic Network Mailing List (PSN-L)
Subject: Y2K and an old Packard Bell 486
From: meredith lamb psnseismograph52@..........
Date: Tue, 17 Aug 1999 20:20:32 +0000
For those with old Packard Bell computers....
Finally got around to checking Y2K on an old 1993-94? Packard
Bell 486 desktop computer. Instead of the usual date change check,
I downloaded their Year 2000 Test Utilities & Remedies at web site:
http://www.packardbell.com/y2k/pb/remedy.asp
The program is downloaded and put on the hard drive. After
reading the instructions, the machine is readied with another floppy
which is loaded. Shutdown and restarting starts the test, which
extends up to around the year 2008.
The first result was that the machine failed; but could be manually
set for 2000. Future years thereafter were also in doubt.
Along the way, the program had a replacement file to try, and
that was put on the system. The test continued and luckily it
passed them all. The test program warned that date sensitive
material could not be run 24 hours a day with the fix, with any
kind of guarantee... 2000 and on will tell, if it really works
with SDR....
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Possible GPS glitch
From: Greg ghost@.............
Date: Tue, 17 Aug 1999 20:57:29 -0700
You might want to look into this if you're using a GPS receiver.
Especially older civilian equipment.
There's a story on CNN.com about this. The link from the story is below.
The original story is on cnn.com.
http://www.navcen.uscg.mil/gps/geninfo/y2k/default.htm
,Greg
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Public Seismic Network Mailing List (PSN-L)
Subject: step/sine auto-calibrator
From: S-T Morrissey sean@...........
Date: Tue, 17 Aug 1999 23:45:09 -0500 (CDT)
Rex,
I'm sorry I have not responded about the calibration board questions.
It also brings up a point about seismometer calibration that I didn't
mention earlier, namely using a bridge circuit with the main coil to
introduce a calibration signal when a calibration coil is not available.
(or has been burned out). This assumes that the main coil constant is known.
Here is brief description of how the circuit is supposed to work; follow
it on your schematic. The calibrator is designed to work in a bridge
circuit with the main coil of an L4-C with the damping resistor installed
across it. Hence the bridge balance pot R23 is 5k ohms. The calibration
sequence is triggered by the "beep" of a 24-hour watch at pin 3; leads are
soldered to the beeper and the case inside the watch. Before the availability
of lithium batteries, the Hg watch battery was also trickle-charged by the
calibration board (the dangling diode/resistor to pin 2). The watch ground
is to pin 4. The 24-hour alarm is set for a night time hour; in a network,
different times must be used to avoid loosing all the data if a quake
should occur at a singular calibration time.
The beep is rectified by a diode and amplified by U12 to provide a pulse
that un-resets the oscillator and the dividers via U5..
The oscillator U1 outputs 2khz; divider U2 outputs 200hz, 60hz, and 20hz.
Divider U3 outputs 1hz; the first 4017 U4 outputs 10 seconds, and U5
sequences the switches of U11, a 4066 quad switch. U7 and U8 form a
20-step sine generator, so sine frequencies of 10, 3 and 1 hz result
from the switched inputs of 200, 60, and 20 hz from U2. Amplifier U13
buffers the switch outputs and filters the sine wave; Amplifiers U9 and
U10 buffer and invert the signal to drive the calibration bridge.
THe sequence is ended by U5 reasserting its pin 6.
After the trigger or the test switch is activated, the sequence switch first
applies a DC step to the calibration bridge for ten seconds, then turns it
off. A 100k pot R14 controls the DC amplitude. Then there is a 10 second delay.
The 20-step sine wave generator can be configured to have any two outputs
like 3hz and 1 hz (or other combinations). These are sequentially switched
in to the calibration bridge for 10 seconds each after the DC step. The sine
amplitude is controlled by a 100k pot R13. Then C2/C3 remove the DC offset
and amplifier U13 filters it.. The oscillator frequency can be changed to
200 hz, which divides all the frequencies and times by 10 for use with
a long-period instrument. (C2 thru C9 need to be 10xed).
The bridge balance pot is set by clamping the seis (by laying it on its
side) and adjusting the amplifier output for a minimum signal. The switch
manually starts the calibrator and holds it in the 3hz or 10hz sine wave
mode for this adjustment. The sine amplitude is easy to set in this mode,
but the 10-second DC step has to be set on the fly.
In standby the current drain is about 50 microamps. I'm not sure what
the current is when it is activated, but I think it is less than 1 ma..
I used to have fun shopping for a set of 20 or so watches for the trigger
at places like Service Merchandise. The salesperson always wanted to
know what I was going to do with 20 watches, so I simply said that I
was going to bury them in the ground. They double checked my credit card!
I hope this explains everything. I can provide the artwork for the 2.5"
x 5.5" PC board (single sided) if anyone wants it.
Regards,
Sean-Thomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Local event
From: Edward Cranswick cranswick@........
Date: Wed, 18 Aug 1999 08:44:06 -0600
Larry-
I think it would be great if your records are used because I know how
careful you are with the calibration and timing and your recording site is out
there in Redwood City on the valley sediments of the Bay where we have few
records, strong motion or otherwise. Similar sites underlain by unconsolidated
sediments proved to be lethal in the Turkey Earthquake as they also did in the
Marina District in the 1989 Loma Prieta Earthquake.
I am leaving for Turkey on Friday.
-Edward
Larry Cochrane wrote:
> Hi Lind,
>
> I heard your interview on channel 2 a few minutes ago, good job! I felt the
> event very nicely while viewing a report on the terrible Turkey event. If
> your seismologist need any more records to look at, for our local event, I
> have some strong motion data and one on scale record from a L28. My other
> sensors saturated.... The strong motion data is from a Kinemetrics FBA-23A
> on loan from the local USGS. This sensor was calibrated about a year ago.
> Timing for my event files are accurate to within a few milliseconds and is
> referenced to WWV. I used GPS for my station location and should be
> accurate to within 30-50 meters. I'm sure you guys have enough records too
> look at but I thought someone there might be interested in the strong
> motion data.
>
> Regards,
> Larry Cochrane
> Redwood City, PSN
>
>
--
Edward Cranswick Tel: 303-273-8609
US Geological Survey, MS 966 Fax: 303-273-8600
PO Box 25046, Federal Center cranswick@........
Denver, CO 80225-0046 USA E.M. Forster said, "Only connect".
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Turkey on seismo viewer
From: "Francesco" franuc@......
Date: Thu, 19 Aug 1999 01:43:49 +0200
I've updated the seimogram viewer java program with Turkysh event.
I have choose at random, from all over the world, four file:
one of italian station, one of Hawaii, one of Colorado and one of Texas.
See at: http://web.tiscalinet.it/iesn/sve.html
Regards
Francesco
p.s.: please, remember to push reload command (from window's men=F9 of =
the applet) after the view of each file (for a large visualization).
I've updated the seimogram viewer java program with Turkysh=20
event.
I have choose at random, from all over the world, four file:
one of italian station, one of Hawaii, one of Colorado=20
and one of Texas.
Regards
Francesco
p.s.: please, remember to push reload command (from window's =
men=F9 of=20
the applet) after the view of each file (for a large=20
visualization).
Subject: Izmit EQ
From: jimo17@........
Date: Wed, 18 Aug 1999 17:29:16 -0700
Hi All,
You can find the latest information on the Izmit EQ on this WEB page, a
university and seismological observatory in Turkey.
http://www.koeri.boun.edu.tr/earthqk/earthqk.html
Date: 1999-08-17 at 03:01:37 , Surface Wave Magnitude: 7.8
Body
Wave Magnitude: 6.3
Duration
Magnitude: 6.7
Location: lots of maps, etc
Seismicity of the Region
Surface Faulting- The right lateral displacement offset of NAF between
Sapanca
Lake and Izmit Gulf was reported as 2.60m.
Extent of the Damage-Lots of PIC's of damage, etc, Transportation
Damages: Highway, Railway, Industrial Facilities:
Damage areas in Istanbul and Turkey
Peak Accelerations (only .3 g max!) Strong Motion Stations in Istanbul
and the Marmara Region
(I got this information from Prof. Barbara Luke, UNLV Engineering, who
has a student visiting Istanbul)
Jim O'Donnell
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Magnitude of Izmit event
From: S-T Morrissey sean@...........
Date: Thu, 19 Aug 1999 00:49:58 -0500 (CDT)
Regarding the magnitude of the Izmit event; since there is some
discussion as to what it really should be (aside from the various
ways of expressing it:Mb,Ms,Ml,Mm, etc), curiosity suggests that the
PSN see what its data provides. I don't know what WINQUAKE is giving
for those who have it; I don't have it here.
But everyone can use their own data and location to calculate Ms.
To use a particularly generic formula, Gutenbergs' old formula is:
Ms = log(A/P) + 1.66*log(distance) - 0.18. , where A is the p-p ground
motion in nanometers (10^-9meter), P is the period in seconds, and the
distance is in degrees. The value of the corrector term (-0.18) is
subject to much debate, and has large regional variations.
We can use the data from the STM-8B running here in the basement with the
B version of the multi-period feedback set for 40 seconds, and digitizing
with the RS multimeter set for 200mv full scale. The output of the VBB
seismometer is 5,293 Volts/meter/second after the line driver.
The signal actually clipped in the 12-bit digitizer during the surface
waves at +,- 200 millivolts, or about 75 microns/second peak-peak. But
graphic extrapolation of the plotted data gives a mean p-p amplitude of
about 150 microns/second at 24 seconds, which is a displacement (multiplying
150 by 24/2*pi) of 572 microns or 5.72*10^5 nanometers..
Using a globe to get the distance, I find that western Turkey is about 120
degrees from St. Louis.
So calculating the terms of the magnitude formula:
log(A/P) = log[(5.72*10^5)/24] = 4.377
1.66*log(distance) = 1.66*log(120) = 3.45
So Ms = 4.377 + 3.45 - 0.18 = 7.65.
Considering the uncertainties, this is pretty close. Changing the numbers
by 10% changes the result by +,- 0.1 to 0.2 unit..
Regards,
Sean-Thomas
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Public Seismic Network Mailing List (PSN-L)
Subject: More on the group sensor buy - final cost
From: Larry Cochrane cochrane@..............
Date: Wed, 18 Aug 1999 23:17:45 -0700
All Geophoners,
It looks like the final cost for the sensors will be $295.00 for the 1 hz
device and
$37.00 for the 4.5 hz sensor. These prices include the cost for shipping
the sensors from Texas to Redwood City, Ca, but not the cost too ship the
sensor to the user. I'm not sure what the weight is for the sensors, or
what type of box and packing material I will need, so its hard to give an
exact price. My guess is that for the 1 hz sensor shipping cost will be
around $15.00 to $20.00 to addressed in the US, more for out of the country
orders. Maybe a little less for orders here in California. For the 4.5 hz
device the shipping cost should be about 1/2 the price.
Too get the ball rolling lets do this. If you ordered one 1 hz sensor and
you live in the US send me a check for $312.00. If you ordered one of the
4.5 hz device send me a check for $45.00. If the shipping cost ends up
being a lot less or a lot more I will send you a refund or ask for more $.
If you ordered more then one sensor the shipping cost should be a little
less. I will contact you directly with a price. I will also contact you
directly if you live outside of the US.
Please make your check out to me and send it too:
Larry Cochrane
24 Garden Street
Redwood City, Ca. USA
94063
The order is going to be around $4500.00! Unfortunately I don't have that
much money to write out a check and send it to Jim. So, when I get enough
money together I will send Jim a check. When I receive the sensors I will
check them out and send them too you.
-Larry Cochrane
Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: LARGE QUAKE IN PROGRESS
From: "Giovanni Rotta" rottag@..........
Date: Thu, 19 Aug 1999 17:33:05 +0200
Italian stations are recording a large quake new.
Probably reply of Turkey -
Giovanni
Giovanni Rotta
Via F. Pizzigoni, 10
33010 Resia (Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
Italian stations are recording a large quake=20
new.
Probably reply of Turkey -
Giovanni
Giovanni Rotta
Via F. Pizzigoni, 10
33010 =
Resia=20
(Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
Subject: R: LARGE QUAKE IN PROGRESS
From: "Francesco" franuc@......
Date: Thu, 19 Aug 1999 18:04:35 +0200
Turkey aftershock
Ml 4.9~
Francesco
=FF=FE<=00!=00D=00O=00C=00T=00Y=00P=00E=00 =00H=00T=00M=00L=00 =
=00P=00U=00B=00L=00I=00C=00 =
=00"=00-=00/=00/=00W=003=00C=00/=00/=00D=00T=00D=00 =00H=00T=00M=00L=00 =
=004=00.=000=00 =
=00T=00r=00a=00n=00s=00i=00t=00i=00o=00n=00a=00l=00/=00/=00E=00N=00"=00>=00=
=0D=00=0A=
=00<=00H=00T=00M=00L=00>=00<=00H=00E=00A=00D=00>=00=0D=00=0A=
=00<=00M=00E=00T=00A=00 =
=00c=00o=00n=00t=00e=00n=00t=00=3D=00"=00t=00e=00x=00t=00/=00h=00t=00m=00=
l=00;=00 =
=00c=00h=00a=00r=00s=00e=00t=00=3D=00u=00n=00i=00c=00o=00d=00e=00"=00 =
=00h=00t=00t=00p=00-=00e=00q=00u=00i=00v=00=3D=00C=00o=00n=00t=00e=00n=00=
t=00-=00T=00y=00p=00e=00>=00=0D=00=0A=
=00<=00M=00E=00T=00A=00 =
=00c=00o=00n=00t=00e=00n=00t=00=3D=00"=00M=00S=00H=00T=00M=00L=00 =
=005=00.=000=000=00.=002=000=001=004=00.=002=001=000=00"=00 =
=00n=00a=00m=00e=00=3D=00G=00E=00N=00E=00R=00A=00T=00O=00R=00>=00=0D=00=0A=
=00<=00S=00T=00Y=00L=00E=00>=00<=00/=00S=00T=00Y=00L=00E=00>=00=0D=00=0A=
=00<=00/=00H=00E=00A=00D=00>=00=0D=00=0A=
=00<=00B=00O=00D=00Y=00 =
=00b=00g=00C=00o=00l=00o=00r=00=3D=00#=00f=00f=00f=00f=00f=00f=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00T=00u=00r=00k=00e=00y=00 =
=00a=00f=00t=00e=00r=00s=00h=00o=00c=00k=00<=00/=00F=00O=00N=00T=00>=00<=00=
/=00D=00I=00V=00>=00=0D=00=0A=
=00<=00D=00I=00V=00>=00&=00n=00b=00s=00p=00;=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00M=00l=00 =
=004=00.=009=00~=00<=00/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00&=00n=00b=00s=00p=00;=00<=00/=00D=00I=00V=00>=00=0D=
=00=0A=
=00<=00D=00I=00V=00>=00<=00F=00O=00N=00T=00 =
=00s=00i=00z=00e=00=3D=002=00>=00F=00r=00a=00n=00c=00e=00s=00c=00o=00<=00=
/=00F=00O=00N=00T=00>=00<=00/=00D=00I=00V=00>=00<=00/=00B=00O=00D=00Y=00>=
=00<=00/=00H=00T=00M=00L=00>=00=0D=00=0A=
=00
Subject: Re: step/sine auto-calibrator
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Thu, 19 Aug 1999 13:41:02 -0400
Sean
Thanks for the details of the calibration circuit. Mine appears to be working. I
built it on a vector 'plug-in' card I found on my shelf.
New question! I am looking at your seismic amplifier circuit and the photo of the
pc cards (seispreamp.jpg) and have a question? What type of capacitor are used for
the high pass filters (330mF) on the pictured boards?
Thanks in advance
--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: S-G Calibration Scheme (LONG)
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Thu, 19 Aug 1999 13:44:51 -0400
This is my idea of a calibration plan for my S-G seismometers. So look
it over and shoot holes in it!! I am going to use a computer that has
an A/D (12 bit) Board and LABview. I will plot the output of the S-G
circuitry (high output) and plot voltage vs time. I can get fairly
accurate readings of voltages and time using the LABView software. Most
of my calibration plan comes from the "Manual of Seismological
Observatory Practice". Keep in mind that this is pure theory, I haven't
tried any of these procedures yet!! I am also going to disassemble my
SGs and weight each pendulum and measrure center-of-gravity using a
knife-edge or string loop.
Measure the natural period:
1. Connect the S-G output to the data plotting system and install
calibration coil (see my webpage).
2. Disconnect damping (I have a toggle switch on controller box).
3. Using leveling screws, adjust the voltage output to as close to 0 as
possible (I have 1/4"-80 leveling screws). This can be roughed in using
the 'tilt' LED on SG card (which I have moved to outside of box).
4. Set pendulum into oscillation by discharging a capacitor into
calibration coil.
5. Record the the oscillations on plotting system.
6. Measure several periods and average to determine the apparent period
T's.
7. Measure the amplitude of the waveform from the 0 line to peak and
label each successive crossing of 0 line as a[1],a[2],...a[n].
8. Calculate the mean value of logarithmic decrement L[r] =
log[(a[r]+a[r=1])/(a[r+1]+a[r+2])] {log base 10}. I am a little unclear
as to how to calculate the "mean value". The best I can come up with is
to 'slide a window' three (3) samples wide down through the data and
calculate the L for each 'stop'and then average these values. I have
looked through my math books and found nothing on logarithmic decrement
(anybody got a reference?).
9. Calculate the true period Ts = T's/(1+0.53/(L*L))**0.5.
Measure static magnification:
I have three leveling screws (1/4"-80) located in a triangular pattern.
The distance from the back (2) leveling screws and the front (1)
leveling screw is 10.00". If my trig is right, one turn of leveling
screw is 0.00125 radian of tilt. I also plan to use a dial indicator to
measure the actual lift of front edge of base and modify my trig
accordingly.
Also, the scheme I am using is described in the Manual of Seismological
Observatory Practice to calibrate the magnification of the tilt of
seismometer and mechanical indicator. I think it should work to give
the magnification of the seismometer and the voltage output of the S-G
board. Once I have that, I should be able to convert the voltage levels
into SDR A/D units. I have a voltage calibrator at work that outputs
voltage to three places to the right of decimal point. I plan to
generate a series of readings and plot on spreadsheet.
1. Measure the natural period as above (Ts).
2. Connect the S-G output to the data plotting system and verify that
damping is off.
3. Using front leveling screw, adjust the voltage output to as close to
0 as possible.
4. Apply a know tilt (single turn of leveling screw or via dial
indicator) and record voltage level.
5. Keep increasing tilt until output (voltage) reaches level that
indicates maximum travel (to be determined--maybe where the linearity
falls apart). Record each step change in tilt and resoluting voltage
level. Keep the step changes equal.
6. Return tilt to 0 volts.
7. Repeat step #5 with tilt in opposite direction.
8. Enter the recorded data into spreadsheet and generate calibration
curve.
9. Calculate the undamped natural frequency Omega = (2*PI)/Ts
10. Solve for the static magnification (l/l')
(l/l') = a/(tilt*g*Omege*Omega) a is voltage deflection
g is gravity (9.81m/(s*s))
Now, this is where I am having a problem! I am now like the dog who
chases cars, what am I going to do if I catch one! :). I now should
have a binary_count_SDR/radian calibration factor or factors (if
linearity too bad, maybe a piecewise linearization would help), how do I
convert this into parameters that can be used to correlate data between
stations??
Measuring Damping:
1. Reconnect damping.
2. Connect the S-G output to the data plotting system.
3. Install calibration coil.
4. Apply pulse to calibration coil by discharging a capacitor into it.
5. Record oscillations on plotting device.
6. Measure the elapsed (t)time from first peak of oscillation (a[1]) to
the second peak on the other side of 0 line (a[2]).
7. Calculate normalized time (t') t' = omega*t
8. Calculate a[2]/a[1] to determine which curve to use in Fig 4.2.4 in
Manual of Seismological Observatory Practice. Look up value of damping
(Beta) based on proper curve and t'.
According to Larry's SG Sensor Damping Adjustment instructions, the
damping potentiometer should be set so that the oscillation should die
away in about 1-1/2 cycles. This adjustment can be accomplished by
using steps 1-5 until the waveform has proper decay and then continue to
convert that setup into a damping factor.
---------
Have mercy!! I am really a neophyte in the seismometer design area!!
--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Izmit Ms Calculation
From: S-T Morrissey sean@...........
Date: Thu, 19 Aug 1999 14:59:00 -0500 (CDT)
Kevin Mackey has pointed out an error I made in the distance for
the Izmit event. It appeared that I had not used the "Great Circle"
distance; I had, but I measured and scaled it wrong.
However, I was not pretending to do exact science at home; I have
innumerable programs at the Univ for that. What I was trying to do
was to show what a PSN member can do with home resources. I used a
ruler on a globe as an approximation to determine the epicentral
distance from St. Louis.
The upper limit is of course the longitudinal distance, with
St. Louis at 90W and the event at 29.8E. My antique globe has no
scale on it, so I "calibrated" the ruler with the distance between
St. Louis and San Francisco = 30 degrees, which led to over estimating
the distance to Izmit. The actual STL to SFO distance is about 21 degrees.
This makes my "ruler" say 84 degrees to Izmit; Kevin says it is 81
degrees. I should have suspected the error from the longitudinal information.
The point is that simple, not so accurate measurements, are useful.
At large distances, the effect of errors is not that significant.
The difference in the calculated magnitude between 120 degrees and
81 degrees is 0.28. This reduces my magnitude estimate from 7.65 to
7.37, which is actually closer to todays' revised figure of 7.4.
(I get 7.41 if I use 84 degrees!).
I am more interested in how the amplitudes recorded by the PSN
instruments worked out in determining the magnitude.
Unfortunately, even large variables in the magnitude estimate provide no
excuse for the hugh tragedy caused by shoddy building construction.
Of course cement is expensive in that part of the world, but if only
enough is used to keep the rain from washing out the mortar, it doesn't
take much to shake down an apartment building.
Regards,
Sean-Thomas
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Public Seismic Network Mailing List (PSN-L)
Subject: Grounding
From: Dick Webb dwebb2@..............
Date: Thu, 19 Aug 1999 20:06:01 -0400
Well, my third board in 5 years has just bit the dust in an electrical
storm and power outage. I have Larry's amp board in a vault out back and
run wires, barely below the surface to my PC in the house. I also run a
wire from the house to the vault for 110 volts. Both the incoming line and
a line from the WWV antenna go to Larry's AtD board. That is the board
that blew. The incoming line and the case I have the amp in are grounded
or so it seems to me. Is there any way to protect the overall system or
should I consider board replacement an operating expense.
Dick Webb
Raleigh, NC
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Grounding
From: "jeremy t.l." tagrtfly@..........
Date: Thu, 19 Aug 1999 17:33:37 PDT
try placeing fuseable links or build a circut breaker EX.like some bathroom
outlets i haven ever had a problem with electronic going out in the many
circut boards i have made so try it
jeremy lange
Fruita, colorado
________________________________________________________________
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Subject: Re: Grounding
From: David Josephson david@.............
Date: Thu, 19 Aug 1999 17:42:50 -0700 (PDT)
> that blew. The incoming line and the case I have the amp in are grounded
> or so it seems to me. Is there any way to protect the overall system or
> should I consider board replacement an operating expense.
Dealing with lightning currents is just like dealing with noise in board
design, just bigger. You should have a lightning rod, grounded to its own
ground stakes (3 of them, a foot apart, 10 feet deep, minimum) and this
setup should be as far away from your instrumentation as possible. Then
be sure that the lowest resistance path from your vault ground, rack ground,
etc. to the same ground stakes is via a thick wire that's run as far
away from your signal wires as possible. The input leads should be
twisted as tightly as possible to eliminate loop area for magnetic coupling
of the surge to the inputs of the gear. Finally you should look at the
input circuitry of whatever blew up and protect it with gas tubes and/or
MOV type surge suppressors, each routed to the same ground stake. Wide
copper strap from the earth stake to your cold water system is good too.
--
David Josephson / Josephson Engineering / San Jose CA / david@.............
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Grounding
From: SW6079@.......
Date: Thu, 19 Aug 1999 21:07:13 EDT
Well, If you can handle some more info, these ideas may help. I lost the
preamps to two fairly expensive Ham receivers before trying these ideas...
Basically, Nothing will save you on a direct hit, But I installed two zener
diodes across the coaxial cable
nearest the ground connection outside. I believe I used 5.1 volt zeners, 1
watt rating.
I wired them in parallel, one with its anode on the antenna hot lead, the
other with its cathode on the hot lead.. the other leads going to the shield
of the coaxial cable. I believe that you could even use a lower value w/
Larry's boards (ie 3.3 volt) without upsetting the circut operation. I am
certain that in at least one case they did the job, as one day after a nasty
storm my receiver would not work with the antenna lead connected. I
investigated and found one of the zeners had shorted! I also use a lightning
arrester (which is really nothing more than a spark gap) However it takes
upwards of a thousand static volts usually to make one of these arc.... You
can well
imagine that your sensitive electronic equipment will protect the spark gap
by conducting first!! Good luck Mike. sw6079@....... N7ORL
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Grounding
From: JIm Hannon jmhannon@........
Date: Thu, 19 Aug 1999 20:56:59 -0500
SW6079@....... wrote:
> Well, If you can handle some more info, these ideas may help. I lost the
> preamps to two fairly expensive Ham receivers before trying these ideas...
> Basically, Nothing will save you on a direct hit, But I installed two zener
> diodes across the coaxial cable
I keep seeing the statement "nothing will save you from a direct hit" I would
agree more with the statement "nothing will save you from every direct hit".
Radio and TV towers often get hit every storm. The hits may trip the station off
line until someone pushes the reset button, but most of the time no permanent
damage is done. We designed some radio equipment for unatended operation in a
very remote and thunder storm prone area. All the electronics are in a rf tight
metal cabinet with all wires entering the cabinet protected with several layers
of arrestors and surge protectors. One time one of these units stopped working.
When the service tech got there he found the coax leading the cabinet was nothing
but a plastic tube. All the copper had been evaporated. He replaced the coax and
everything worked fine. I suppose at some point it may not be worth the expense
for this level of protection.
I am still struggeling with a lightning problem here at home. I go thru surge
protectors like popcorn. The last storm all the electrolumenescent night lights I
have blew.
Jim Hannon
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Public Seismic Network Mailing List (PSN-L)
Subject: Re: Grounding
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Fri, 20 Aug 1999 08:25:31 -0400
You might look into the line protection schemes used in industrial/phone lines
that are buried. You can get lighting strikes via underground line. A number
of manufactures sell devices that protect these lines from lighting strikes.
Go to the library and look up manufactures of lighting suppressor in the
Thomas Register. You might look at companys that specialize in protectors for
RSXXX line are 4-20mA current loops. I have seen devices that hang off of
each line and are connected to ground (they must be mounted outside and away
from device to be protected.
Dick Webb wrote:
> Well, my third board in 5 years has just bit the dust in an electrical
> storm and power outage. I have Larry's amp board in a vault out back and
> run wires, barely below the surface to my PC in the house. I also run a
> wire from the house to the vault for 110 volts. Both the incoming line and
> a line from the WWV antenna go to Larry's AtD board. That is the board
> that blew. The incoming line and the case I have the amp in are grounded
> or so it seems to me. Is there any way to protect the overall system or
> should I consider board replacement an operating expense.
>
> Dick Webb
> Raleigh, NC
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Grounding
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Fri, 20 Aug 1999 08:25:31 -0400
You might look into the line protection schemes used in industrial/phone lines
that are buried. You can get lighting strikes via underground line. A number
of manufactures sell devices that protect these lines from lighting strikes.
Go to the library and look up manufactures of lighting suppressor in the
Thomas Register. You might look at companys that specialize in protectors for
RSXXX line are 4-20mA current loops. I have seen devices that hang off of
each line and are connected to ground (they must be mounted outside and away
from device to be protected.
Dick Webb wrote:
> Well, my third board in 5 years has just bit the dust in an electrical
> storm and power outage. I have Larry's amp board in a vault out back and
> run wires, barely below the surface to my PC in the house. I also run a
> wire from the house to the vault for 110 volts. Both the incoming line and
> a line from the WWV antenna go to Larry's AtD board. That is the board
> that blew. The incoming line and the case I have the amp in are grounded
> or so it seems to me. Is there any way to protect the overall system or
> should I consider board replacement an operating expense.
>
> Dick Webb
> Raleigh, NC
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Mag. calc.
From: robert barns 75612.2635@..............
Date: Fri, 20 Aug 1999 10:48:45 -0400
Sean-Thomas,
Thanks for the detailed calculation example of Ms for the Turkey 'quake=
and the STM-8B. Impressive agreement! I haven't been able to figure out=
how you get the "p-p amplitude at 24 seconds" from your seismogram.
Bob Barns
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Grounding
From: Karl Cunningham karlc@.......
Date: Fri, 20 Aug 1999 09:32:59 -0700
Dick --
One thing that may not have been mentioned is to run the signal wires
inside *metal* conduit, grounded at both ends (as well as you can). Also,
don't run the 110V power lines in the same conduit. A nearby lightning
strike could put a large spike on the power lines, which could couple into
the signal lines.
I agree with the suggestion of zener diodes across the signal lines.
Zeners are very fast at turing on and good-sized ones will dissipate a very
large amount of power for a short time. Put them at the amp input and keep
the leads short to improve high-frequency response.
Karl Cunningham
La Mesa, CA.
PSN station #40
karlc@.......
At 08:06 PM 8/19/1999 -0400, you wrote:
>Well, my third board in 5 years has just bit the dust in an electrical
>storm and power outage. I have Larry's amp board in a vault out back and
>run wires, barely below the surface to my PC in the house. I also run a
>wire from the house to the vault for 110 volts. Both the incoming line and
>a line from the WWV antenna go to Larry's AtD board. That is the board
>that blew. The incoming line and the case I have the amp in are grounded
>or so it seems to me. Is there any way to protect the overall system or
>should I consider board replacement an operating expense.
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Grounds!
From: Mike Lozano mikel@.......
Date: Fri, 20 Aug 1999 13:57:07 -0500
I've been following the discussion on 'grounding' with a great deal of
interest. What's becoming plainly obvious is that there are many
misconceptions which are being perpetuated in this forum. One of those
misconceptions is that 'grounding' is a D.C. phenomenon, measured as a
resistance. It's not! When speaking of 'ground resistance' we're
actually speaking of 'ground impedance' or resistivity. This
'resistance' can only be measured with special equipment, using the
'fall of potential' technique. This type of equipment is manufactured
by companies such as Biddle and AEMC, to name but a few; and, it may be
possible to ask your local power company or lightning protection company
to check your ground rods for the proper 'resistance'.=20
The resistance issue has clouded the field of grounding, and is best
demonstrated by the 'more is better' school of thought. These
proponents hold that if one ground rod is good, then multiple ground
rods are better =85. the 'more then merrier' school. At first blush, thi=
s
technique seems to make sense. The confusion stems from confusing
'ground resistance' with 'resistance' in D.C. analysis. While in D.C.
analysis, resistors in parallel decrease the total resistance to less
than the value of the least one, this is most definitely not true when
multiple ground rods are considered! In fact, when driving multiple
ground rods; they should be driven no closer together than twice the
length of a single rod. Although beyond the scope of a short note, the
reason the 'more the merrier' is not a valid ground resistance reduction
technique has to do with mutual inductance between the rods.
As to the placement of signal leads in conduit, care must be taken that
ground currents flowing through the conduit walls don't couple currents
into the conductors encased within. In short, this technique creates a
linear transformer! As to the prevention of dangerous voltages reaching
a sensitive instrument, a multiple protection scheme must be used. T
he principal idea is to provide both 'common' and 'differential' mode
protection. For example, take two signal lines referenced to 'ground'.=20
Common mode transients take both lines 'high' in respect to 'ground'.=20
Differential mode transients, on the other hand, take one line, or the
other 'high' in respect to the other two.
If it'll make it a bit clearer, consider the case of a common A.C. surge
suppressor. It you take one apart, you'll find three Metal Oxide
Varistors, or MOVs inside. One MOV goes from the Black wire to the
White wire. This is the differential mode protector. The two MOVs going
from the Black and White wire to the Green or 'ground' to provide common
mode protection. The exact, same principle can be used to protect any
number of signal lines.
One fellow asked if replacement boards are to be considered a normal
expense. The answer is, most assuredly not! I've designed and
installed the common/differential protection scheme to protect several
Doppler Radar installations in the Midwest, as well as in the South.=20
These radar systems are located on frequently struck television
transmitting towers. At from one million to several hundred thousand
dollars a pop, my clients simply can't afford to replace these systems;
but it's simple to replace the protection circuits about every five
years, or so.
As to the use of zener diodes - they are fast, but not too sturdy. In
the cases mentioned above, I've used triple protection! A current
limiting agent in the form of a fast-acting thermistor; an MOV and a
gas-filled spark gap. I've found that the MOV (only slightly slower
than a zener) is more than adequate protection. For most signal lines,
I use an MOV rated at 12 Volts, with the highest possible Joule
ratings. As for the gas-filled spark gap, I use a CG75L manufactured by
C.P. Clare Co. This small device fires at approximately 60 volts, and
while slower than an MOV, can handle tremendous amounts of power.
Of course none of these protection schemes will work well without a good
quality grounding system. For the industrial installations I've
performed, ranging from petroleum transfer stations, to 250 foot tall
water towers with telemetry and two-way radio antennae at the top, I
insist on no more than five ohms of ground resistance as measured with a
Biddle ground resistivity meter, using the three lead, 'fall of
potential' method.=20
Just plunking a rod in the ground does not guarantee a good ground! If
you want to construct a ' relatively good quality ground', dig a hole
about the size and depth of a five gallon bucket. The ground wire
should be NO SMALLER than #4 copper stranded wire. Attach that to a =BD
inch to =BE inch thick grounding rod, at least 8 to 10 feet long. Drive
the rod into the ground so that the top of the rod is level with the
bottom of the hole. Then, dig a channel about three inches across, and
three inches deep around the circumference of the bottom of the hole.=20
Into the channel, pour ice cream salt until the channel is filled.=20
Then, fill the hole with dirt; moisten it down and then tamp it down.=20
Every few days add water to make sure than the salt dissolves slowly. =20
The salt will enhance the ground's 'conductivity'! =20
When connecting to the ground lead, make sure there are no kinks or
short bends in the cable. Kinks and bends represent inductance, which
tends to lessen the quality of the ground by raising the impedance.=20
If there's any interest, I'll try to put a JPG diagram of the protection
scheme I use, on my company website at:
http://www.sciencearea.com
I also have a small quantity of gas-filled spark gaps left over from a
project. I'd be glad to make these available to the PSN members at
cost, plus shipping.
Regards to all,
Mike Lozano, Meteorologist / Engineer
NSLI Certified Lightning Safety Professional
Applied Sciences, Ltd.
-0-
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Subject: seismogram amplitude
From: S-T Morrissey sean@...........
Date: Fri, 20 Aug 1999 14:23:10 -0500 (CDT)
Bob,
Yor asked about determining the amplitude of ground motion from a seismogram:
For the case of the STM-8: since this is a triple VBB system, the
sensitivity is determined by the transfer function. For the flat portion
of the response, the constant output level is equal to 1/(G*Cp), where
G = Gn/M and Cp is the feedback capacitor value.
For the STM-8 (or any other moving coil seismometer, including the SG), Gn
is the constant of the feedback coil, namely the speaker coil and magnet.
It is determined by zeroing the sensor (using the displacement detector),
adding a small mass, like 1 gram, and using a potentiometer to control
a small current (from AA battery) to lift the boom back to center. This
results (for the B instrument) in 0.830ma to lift 1 gram, so Gn =
(1gram/0.830ma)*9.8m/sec^2 = 11.815 Newtons/Ampere.
Now M = 0.5kgrams, so G = 23.63. With Cp = 20 microfarads, or 0.00002 farad.
So k = 1/G*C = 1/(23.63*0.00002) = 2116 volts/meter/second. THis is the
output over the whole flat portion of the response, from 40 seconds (or
whatever the long period corner of the VBB is set at) to 30 hz. So it
can be used for any period output in between.
The electronics has a "line driver" amplifier with a gain of X5. This
is more than I need to see the background 6-second microseisms, so I
divide it by two with external resistors. So the signal to my digitizer
is 5290 V/m/sec = 5.29V/mm/sec = 5.29millivolt/micron/sec..
SO what did the "seismogram" show? In this case the data is from the RS
12-bit multimeter digitizer. Operating at a scale of 200mv, full scale is
37.8 microns/second or 75 microns/sec p-p. When I plotted the seismogram,
I could extrapolate the clipped surface waves for an estimate of the
actual p-p value of 150 microns/second.
Again, note that the flat VBB response means that this value is valid
for any waveform from 40 seconds (the current Tn selection) to 30 hz.
I can measure the period of the maximum sustained waveform (which is
used for the Ms calculation) from the seismogram plot as 5 cycles over
120 seconds = 24 seconds. The Ms calculation needs the p-p ground
amplitude in nanometers. To convert the velocity of 150microns/second
into displacement, it is divided by (w)omega = 2*pi/P, where P is the
period. So 150/w = 150*24/(2*pi) = 573 microns, or 5.73*10^5 nanometers.
This means that the p-p ground motion at St. Louis from the Izmit event
was about 0.57 millimeters.
Plugging this into the magnitude formula:
Ms = log(A/P) + 1.66*log(distance) - 0.18
Ms = log(5.73*10^5/24) + 1.66*log(81degrees) -0.18
Ms = 4.378 + 3.17 - 0.18
Ms = 7.37
Hopefully you will get a similar result with your data. For a conventional
moving coil seismometer, the output is not flat, so the sensitivity at
each period must be determined. Often this is determined from a log-log
graph of the calibration, which is usually determined with a calibration
coil or signal bridge and a function generator.
Regards,
Sean-Thomas
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Subject: Re: More on the group sensor buy - final cost
From: Doug Niessen dniessen@...........
Date: Fri, 20 Aug 1999 16:54:12 -0700
Hi Larry,
My check will be mailed tomorrow. I'm in Folsom CA so it should be there
next week.
Thank you for taking the time and effort to make these purchases.
Thanks,
Doug
p.s. If you ever have a need for hydrophones, let me know.
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Public Seismic Network Mailing List (PSN-L)
Subject: questions on strong motion and pepp systems
From: Doug doug@.............
Date: Sat, 21 Aug 1999 11:51:28 -0700
greetings qfolks,
I am setting up a seismic station here in the santa cruz mountains
of northern CA. I am very close (~1 mile) from the san andreas
fault line and also very close to the bedrock. I will be starting
out with the 1hz and 4.5z geophones from the group buy. Because I
am close to an active fault, I would like to add some strong motion
sensors. I wonder if anyone has recommendations on sources for
these. I don't want to spend thousands on these but I am willing
to spend $500-$1000. Does anyone know what I can get in this price
range, or where I can get them?
I am also wondering if any of you folks use your seismic data to
trigger emergency shut off of gas, electricity, etc. Given my
location it is inevitable that the ground will shake violently
at some point in the future, and I'd like to set up something
that would shut off my main propane valve, electricity to
selected devices, etc. If anyone is aware of commercial sensors
designed to trigger this, or if you have any ideas on this
subject, I would appreciate the help. I also have a 75 gallon
marine reef aquarium here, and I keep having these visions of
water pouring out all over the place. I am wondering if there
is something I could do to help make the aqauarium resilient
to shaking, as in making a custom stand that would shield the
aquarium from the vibrations underneath. Any ideas?
One other question, the PEPP broadband system for $1500 looks
quite interesting. I am wondering if anyone out there is using
this system, and if so I'd like to hear some opinions about
your experience with it. I am wondering if I would be better
off going with strong motion sensors next, or instead adding
the PEPP system to my station. If you were here literally on
the edge of the san andreas fault line on the bedrock, which
would you choose to do?
TIA,
Doug
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Public Seismic Network Mailing List (PSN-L)
Subject: Epicenter Location
From: Arie Verveer ajbv@............
Date: Sun, 22 Aug 1999 11:47:38 +0800
Hi, I have had some remarkable success with winkquake
in predicting the location of an epicentre for a few local
quakes. Using the Kalamunda station and two autodrum
stations, it has been possible to locate an epicentre
within 5 km of the quoted value. Though our depth of these
quake are highly likely to be around 5 km. But you need
a good "P" and "S" wave for the prediction.
I would like to write or use a program that can locate
a quake using the "P" waves. Can anyone help in locating
a program, code or a source of information on how this is
done? I guess a least squares equation is involved but the
way depth is calculated eludes me.
Any ideas.
Arie
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Public Seismic Network Mailing List (PSN-L)
Subject: Analog Devices & Strong Motion Arrays
From: Doug doug@.............
Date: Sun, 22 Aug 1999 04:11:27 -0700
Earlier I asked about strong motion sensors, both for local
seismic data recording, and also for triggering gas shutoff.
Someone sent me the URL for an eval kit from analog devices:
http://www.analog.com/techsupt/eb/EB-232_B.pdf
This kit looks really interesting, it has a simple RS232
connection and comes with software that graphs acceleration.
Would definitely be easy to experiment with. It looks like
this chip is being used for seismic switches
http://www.analog.com/iMEMS/products/ADXL202_top.html
Here's an article about using these for seismic recording
http://www.analog.com/publications/whitepapers/products/Seismart.html
This article talks about using these low cost accelerometers
in large arrays. This sounds really interesting. Does anyone
know if these are really being used for strong motion arrays?
Is this $15 accelerometer really good enough to gather useful
strong motion data? It's definitely an interesting concept,
using low cost parts in large numbers. It will soon be
possible to ethernet-enable these things for really cheap,
like $15. I'd like to explore this idea further, so I'm
going to get the eval kits for the ADXL202 and ADXL105 and
see if I can get one of these individual accellerometers on
the web.
I have on order some SIMM-sized microcontrollers that have
ethernet, I/O processor and RTOS, plus serial and parallel
ports, CAN bus, and 1-wire microlan. Each module has its
own IP address and implements TCP/IP, PPP, HTTP, FTP, and
TELNET. Imagine if you could build a node of a strong
motion array for $50, with all of these internet protocol
interfaces. You could then plug them into ethernet 10-base-t
concentrators, and have really easy ways to get at the data
from large numbers of sensors. You could plug them into any
existing network and browse their data at any time from
anywhere in the world. You could telnet to them, transfer
files, and even use ppp for communications. Does this sound
interesting to anyone? Has anyone done something similar?
I'm thinking about taking one of my SIMM-sized boards and
trying to interface it to one of the low-cost analog devices
accelerometers. The cool thing is that when I'm done, it will
have its own IP address and will be hanging off my local
10-base-t LAN which routes to the Internet. You will actually
be able to browse the sensor itself. The total cost of the
prototype will be about $60. If the data is useful I can
make a large array for really cheap. In fact I can plug
them in anywhere that I can find a 10-base-t network. I
guess that would make it a world wide array. Things that
make you go hmmm ...
-- Doug (seismic newbee but networking professional)
PS. Please share your opinions on the Analog Devices
accellerometers. Are these good enough to provide
useful srong motion data in large arrays? Or are
they really only suited to emergency switching?
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: lightning protection
From: S-T Morrissey sean@...........
Date: Sun, 22 Aug 1999 14:17:21 -0500 (CDT)
Here is some further info about lightning protection from many years
of win and lose experience.. In operating seismic telemetry stations
with VHF transmitters it is obvious that the antenna in the tree or tower
is the lightning rod, and the seismometer buried in the ground is the
ground rod (or will try to be). So successful lightning protection is
essential to equipment survival. In general, we have had more losses of the
VHF radio transmitter than of the telemetry electronics itself. There
were also notable disasters, like when the lightning arced right through
the 1/4" ABS pipe vault from the case of the L4-C to ground. (There is no
rule that lightning has to even LIKE my grounding system and use the
ground rod properly!).
But for the most part the equipment survives. Unfortunately, one never
knows for sure when the protection works; only popped fuses, transistors,
amplifiers and smoked boards say it didn't.
So the protection is multi-level and inserted in any power or signal
interconnection, including the coaxial line to the antenna and the
DC power controllers for the solar panels. It only takes about 20 volts
to burn out the RF output transistor of the radio transmitter which
runs at 14 volts, so a system based on 18 volt MOVs is needed..
Until the advent of MOVs (metal oxide varistors) transorbs were the
device of choice. These are essentially high power zeners designed to
take a surge, and actually have a dissipation rating in joules. They
are expensive, hard to test (without blowing them), and give no external
sign that they are in fact blown. But they are fast, since they have
low capacitance.
So MOVs are preferred, since they clearly self destruct if their power
rating is exceeded.. But they are also large capacitors, so they are
slow. This requires some delay element (usually an inductor) to force
the surge voltage to rise and fire the protection devices. Inductors
are also used to isolate a VHF signal from the lower frequency transient.
I generally use several levels of protection, including the 60-volt
gas discharge devices (available from Newark, Mouser, etc, for under $3.)
These latter may not protect a 12-volt transistor, but will help
reduce the physical damage when the lower voltage MOVs are overwhelmed,
such that the repair may only involve replacing the transistor.
For capacitance-sensitive applications, like a 50-ohm antenna feed,
a small 70-volt neon bulb will work. I installed them at the UHF or N
connector of all the VHF transmitters and receivers. They tend to explode
if overloaded.
I have also found that lightning suppression systems should not be
built on a printed circuit board; the lightning just flashes across
the surface, vaporizing the foils. I use high-barrier terminal strips
with point-to-point wiring. Cleanliness is also important also; dried
sweat is a good conductor. Fuses are installed in-line by using the
GJV type inside clear shrink tube, connected with crimp connectors.
They are used in both sides of the DC power and signal (both siesmic
and FM carrier) lines.These limit the damage when the protection
devices conduct the surge to ground.
For testing the lightning protection, we use a small electric fence
transformer. It could spark across an 1/8" air gap. We use a 110v lamp
in series with the AC primary to limit the power.
For the ground rod, standard copperweld rods are used; since my stations
are in generally wet areas (Southern Missouri, the Aleutians, etc), I
have not needed to salt the ground as Mike L. recommends. But location of
the rod is important; it should provide as direct a path from the
antenna's coaxial feed to the ground at the base of the tower. For a
building, the rod should be installed as close to the probable entry
location of any lightning. Most buildings have the lightning ground
rod installed right under the electrical meter. The electrical panel
ground may also be connected to the cold water pipe.
I there is further interest, I can scan the circuits I use, particularly
those used with the seismic amplifiers and telemetry.
Another note about protecting the AC line: I have had unlimited success
using ferroresonant constant voltage transformers to block transients
on the incoming AC line. These are made by Sola, etc, and are expensive,
costing about $1 per watt of capacity. But they will not pass any power
other than a 60 hz sine wave. They last almost forever, so finds at surplus
stores usually work. After about 20 years the resonating capacitor fails
and the insulation dries out, since they run hot.. They have no "moving
parts", like the relays in the inexpensive switched line regulators, and
will put out 110 volts from an input of 90 to 140 volts. But, as I said,
their main virtue is that they only output a 60 hz sine wave. I have
used one at a key telemetry station with 200ft tower since 1972, and
have never had any lightning damage. I have also been at the 'head-end"
building of a cable TV system, where we rent space 300ft up on the tower,
when lightning has hit the tower, and everything survives, including
the local seismometer/telemetry unit.
Regards,
Sean-Thomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Epicenter Location
From: The Lahrs JohnJan@........
Date: Sun, 22 Aug 1999 13:34:22 -0600
At 11:47 AM 8/22/99 +0800, Arie wrote:
>I would like to write or use a program that can locate
>a quake using the "P" waves. Can anyone help in locating
>a program, code or a source of information on how this is
>done?
Arie,
One possibility would be to use the program Hypoellipse which is
available from this site. There are PC/DOS and SUN/UNIX versions
available.
http://lahr.org/iaspei/northam/ak/s_ak/programs/hypoel/hypoel.html
Cheers,
John
John C. Lahr
POB 1529
Golden, CO 80402
(303) 215-9913
http://lahr.org/john-jan
I am only one, But still I am one.
I cannot do everything, and because I cannot
do everything, I will not refuse
to do the something that I can do.
Edward Everette Hale
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Epicenter Location
From: Larry Cochrane cochrane@..............
Date: Sun, 22 Aug 1999 20:28:52 -0700
Hi Arie,
Also part of the IASPEI software package is a DOS program called XRTP.
This is a data logging program, but it also has some event location
capabilities. One advantage is its written in C, not FORTRAN like
Hypoellipse. I started too pull out the location code but stopped after
finding out it only works with local events. I figured if I was going to
spend the time adding this to WinQuake I would try and find something that
could be used for all type of events...
If you get something working please let me know. I'll see if I can add it
to WinQuake. I will send you the source code in a private email message.
-Larry Cochrane
Redwood City, Ca.
At 11:47 AM 8/22/99 +0800, you wrote:
>Hi, I have had some remarkable success with winkquake
>in predicting the location of an epicentre for a few local
>quakes. Using the Kalamunda station and two autodrum
>stations, it has been possible to locate an epicentre
>within 5 km of the quoted value. Though our depth of these
>quake are highly likely to be around 5 km. But you need
>a good "P" and "S" wave for the prediction.
>
>I would like to write or use a program that can locate
>a quake using the "P" waves. Can anyone help in locating
>a program, code or a source of information on how this is
>done? I guess a least squares equation is involved but the
>way depth is calculated eludes me.
>
>Any ideas.
>
>Arie
>
>
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: aheerfor@......
Date: Mon, 23 Aug 1999 07:38:41 +0200
>
PS. Please share your opinions on the Analog Devices
accellerometers. Are these good enough to provide
useful srong motion data in large arrays? Or are
they really only suited to emergency switching?
<
The latter.
I have a number of these devices. S/N ratio is really poor, making them
useless for seismic use.
Regards, Anders
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: Arie Verveer ajbv@............
Date: Mon, 23 Aug 1999 19:54:17 +0800
Hi Doug, Sorry I cant help on you seismic shut off system
but I do express an interest in the the micro controller
with its own "IP" address and implements TCP/IP ++++.
I remember an article in "Dr. Dobbs" about a real-time
weather station made by a company called:
http://www.pharlap.com/
If you have more info on the manufactures address, that
would be great. Interesting possibilities. - good idea.
Regards
Arie
Doug wrote:
>
> I have on order some SIMM-sized microcontrollers that have
> ethernet, I/O processor and RTOS, plus serial and parallel
> ports, CAN bus, and 1-wire microlan. Each module has its
> own IP address and implements TCP/IP, PPP, HTTP, FTP, and
> TELNET. Imagine if you could build a node of a strong
> motion array for $50, with all of these internet protocol
> interfaces. You could then plug them into ethernet 10-base-t
> concentrators, and have really easy ways to get at the data
> from large numbers of sensors. You could plug them into any
> existing network and browse their data at any time from
> anywhere in the world. You could telnet to them, transfer
> files, and even use ppp for communications. Does this sound
> interesting to anyone? Has anyone done something similar?
>
> I'm thinking about taking one of my SIMM-sized boards and
> trying to interface it to one of the low-cost analog devices
> accelerometers. The cool thing is that when I'm done, it will
> have its own IP address and will be hanging off my local
> 10-base-t LAN which routes to the Internet. You will actually
> be able to browse the sensor itself. The total cost of the
> prototype will be about $60. If the data is useful I can
> make a large array for really cheap. In fact I can plug
> them in anywhere that I can find a 10-base-t network. I
> guess that would make it a world wide array. Things that
> make you go hmmm ...
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Lightning Protection
From: wizard@......... (Rick Jerome)
Date: Mon, 23 Aug 1999 05:10:32 -0700
I have a good book on lightning protection from Polyphaser Corp that I found
valuable for this type of information. The book covers everything from
theory to practical techniques to protect equipment. We have used the
information in this publication to protect our telemetry sites at work.
Title: The Grounds fo Lightning and EMP Protection
Author: Roger R. Block
Polyphaser Corp
1425 Industrial Way
Gardnerville, Nevada 89410-1237
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: More on the geophone group buy.
From: "Warren Shedrick" warren@..........
Date: Mon, 23 Aug 1999 10:04:36 -0700
> Date: Sun, 15 Aug 1999 22:50:03 -0700
> To: psn-l@..............
> From: Larry Cochrane
> Subject: More on the geophone group buy.
> Reply-to: PSN-L Mailing List
> All,
>
> I contacted Jim Croix at Mitcham Industries to see how many of the 1 hz and
> 4.5 hz sensors he has. He has 40-50 of each type of sensor, so everyone who
> contacted me can get one.
>
> This is what I have so far for the group buy:
>
> Who Qt Sensor Type
> David Okrent 1 4.5 hz
> Terence Dowling 1 1 hz
> Arie Verveer 1 1 hz
> Tom Frey 1 1 hz
> Doug at los-gatos.net 1 1 hz
> Larry Cochrane 1 1 hz
>
> If you want to be added to the list please let me know ASAP. I will contact
> Jim in a few days to get a final price for the equipment.
>
> Regards,
> Larry Cochrane
> Redwood City, PSN
>
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
>
Sorry for the late reply, I have been on vacation.
I am interested in (1) 1Hz geophone
Thank you
Warren Shedrick
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: Doug doug@.............
Date: Mon, 23 Aug 1999 10:18:05 -0700
I aksed about the Analog Devices accelerometers:
> Please share your opinions on the Analog Devices
> accellerometers. Are these good enough to provide
> useful srong motion data in large arrays? Or are
> they really only suited to emergency switching?
Anders wrote:
>The latter.
>
>I have a number of these devices. S/N ratio is really poor,
>making them useless for seismic use.
Which ones do you have, the ADXL05s? They have two new
models ADXL105 (replaced ADXL05) and ADXL202. I am
wondering if these have better performance. Also, I am
on the fault line in a quiet area, so I am wondering
if that makes a difference. It is a complete waste of
time trying these for strong motion?
Assuming that the ADXL devices are not useful, does
anyone have any other recommendations for accelerometers
that would yield a better S/N ratio? Or any other
strong motion sensor to complement my 1hz and 4.5hz
geophones?
Thanks,
Doug
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: Doug doug@.............
Date: Mon, 23 Aug 1999 10:23:39 -0700
Arie wrote:
>Hi Doug, Sorry I cant help on you seismic shut off system
>but I do express an interest in the the micro controller
>with its own "IP" address and implements TCP/IP ++++.
>
>[snip]
>
>If you have more info on the manufactures address, that
>would be great. Interesting possibilities. - good idea.
http://www.ibutton.com/TINI/
-- Doug
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: jmhannon@....................
Date: Mon, 23 Aug 1999 13:15:18 -0500
> Please share your opinions on the Analog Devices
> accellerometers. Are these good enough to provide
> useful srong motion data in large arrays? Or are
> they really only suited to emergency switching?
Doug,
It depends on what exactly you want to record. Your geophones should be
good for most local events up to the point of felt shaking. The Analog
Devices accelerometers overlap this a little bit and would then be good up
to the point of total destruction. I can't find the reference just now but
I think I read that the recent quake in Turkey had accelerations of up to
0.3 G. That and much weaker are within the capabilities of the Analog
Devices parts.
Jim Hannon
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: aheerfor@......
Date: Mon, 23 Aug 1999 20:57:27 +0200
>
Which ones do you have, the ADXL05s?
<
Yes
>
They have two new
models ADXL105 (replaced ADXL05) and ADXL202. I am
wondering if these have better performance.
<
From my study of the data sheets, I gather that they don't have a
significantly better performance.
>Also, I am
on the fault line in a quiet area, so I am wondering
if that makes a difference.
<
It does. You may get stronger motion than here. I am far from any fault
line.
> It is a complete waste of
time trying these for strong motion?
<
No, the devices are fine for strong motion. Say, when you are at the
epicenter.
And when your seismometers are driven into saturation.
Bruel and Kjaer make many fine accellerometers. One of these has an
extremely fine S/N ratio compared to other accellerometers.
Regards, Anders
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: aheerfor@......
Date: Mon, 23 Aug 1999 21:06:26 +0200
For a sensitive accellerometer, look at:
High Sensitivity Accelerometer Type 8318-C.
see web page
http://www.bk.dk/5000/5223.htm
Regards,
Anders
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: Doug Crice dcrice@............
Date: Mon, 23 Aug 1999 12:03:17 -0700
jmhannon@.................... wrote:
>
> > Please share your opinions on the Analog Devices
> > accellerometers. Are these good enough to provide
> > useful srong motion data in large arrays? Or are
> > they really only suited to emergency switching?
>
>
Back in my youth, there was a maximum theoretical acceleration from an
earthquake of a fraction of a g. Then the Piocama (sp?) Dam earthquake
recorded 1.01 g on bedrock. This was a good sized earthquake, but not
big enough to inspire memories like the 1972 or Loma Prieta
earthquakes. I would think that sitting up on the fault you could get
some stuff well within the range of sensitivity of that accelerometer.
You'll have to wait a while, but your geophones are going to be useless
when it happens and you'll feel bad if you don't get a decent recording
of your own personal event.
Regarding that fish tank, it's going to have serious problems. Down
here in Saratoga (10 miles North) we had waves over 6 feet in my
swimming pool and lost about two feet of water from the last Loma Prieta
earthquake. I'm not sure of the solution, maybe suspend it from rubber
bands from the ceiling and put on a cover.
Don't forget that most strong-motion seismographs fail because the
batteries are dead, you will not have any power when it hits, so maybe
one of those computer power supplies is in order.
--
Doug Crice web site http://www.georadar.com
GeoRadar Inc. e-mail dcrice@............
19623 Via Escuela Drive phone 408-867-3792
Saratoga, CA 95070 USA fax 408-867-4900
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: John Lahr lahr@...................
Date: Mon, 23 Aug 1999 14:23:51 -0600 (MDT)
Doug,
You wrote, "Assuming that the ADXL devices are not useful, does
anyone have any other recommendations for accelerometers
that would yield a better S/N ratio?"
Here's a message that I put on the PSN back in April. John Evans is
using these sensors for seismic recording - although I'm not sure
which model is currently preferred.
JCLahr
>Because of the possible interest to PSN members,
>I've put a copy of John Evans' USGS Open-file Report on
>The Design and Performance of a Low-cost Strong-motion
>Sensor onto the following web page:
>
>http://geohazards.cr.usgs.gov/evans/ofr_98_109.html
>
>This address will work for the next few weeks, but
>eventually John E. will be moving the report to a USGS web
>server in Menlo Park. The bulk of the report is in PDF format;
>free readers are available here:
>
>http://www.adobe.com/prodindex/acrobat/readstep.html
>
>in case you don't have one already.
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: Doug doug@.............
Date: Mon, 23 Aug 1999 15:45:12 -0700
Jim wrote:
> It depends on what exactly you want to record.
I want to record only local events, and I'd like to get as much useful
data on these events as reasonably possible without spending thousands
on individual sensors. I guess the real question I have is this: what
would be a good combination of sensors for this purpose? I am getting
both the 1hz and 4.5hz geophones as per the group buy. This leaves me
one extra channel on the amp/filter board, so I am wondering which
type of additional geophone would be good to add as a third? Then, in
addition to geophones, I am looking for other strong motion sensors
that would be good for local recording, as a complement to the geos.
> Your geophones should be good for most local events up to the point
> of felt shaking.
Okay, that is good, since I should detect the smaller local activity.
> The Analog Devices accelerometers overlap this a little bit and would
> then be good up to the point of total destruction.
Well I think they are fine for me then. I understand that they will
not be useful at all for teleseismic events, and therefore are not
what most amateurs would want to use. But in my case they might be
good for local activity (only during large events). Let's hope I
don't get to the point of total destruction any time soon :)
Since I can get the ADXL202s and ADXL105s in the form of cheap and
easy eval boards, I think I'll set up a few of them here, and work
towards connecting them to a microcontroller with ethernet as I
described earlier. Analog also provides free samples so I already
have some of these freebies on the way. If anything it should help
me to learn about accelerometers, and sanity test the sensor <-->
ethernet idea. It sure would be neat to have say 16 of these
plugged directly into a 10-base-T hub, each with their own IP
address and embedded web server. I could have one of my unix
boxes run a cron job and grab the data logs. Also, I could use
flash ROM on the microcontrollers to aid in saving data in the
event of a complete power outage. One thing I like about the
ADXL202 is that it has digital output, therefore requiring no A/D
conversion, and easy to connect to a microcontroller or other host.
In the meantime I got some suggestions for sources other more
sensitive accelerometers. Thanks everyone for all the help. This
stuff is very, very interesting.
-- Doug
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Analog Devices & Strong Motion Arrays
From: Doug doug@.............
Date: Mon, 23 Aug 1999 16:12:43 -0700
Correction wrt my last post:
> Also, I could use flash ROM on the microcontrollers to aid in saving
> data in the event of a complete power outage.
I meant to say flash disk, not flash ROM, which is obviously read only.
-- Doug
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Event?
From: barry lotz gbl@.......
Date: Tue, 24 Aug 1999 19:41:01 -0700
I picked up a fairly large regional event around 13:10 UTC 8/24/99. I
checked the live Internet seismic server and it shows up in New Mexico.
NEIS has a very short list at this time.It doesn't show up there. Has
anyone in California picked this event up?
Barry
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Event?
From: Seisguy@.......
Date: Tue, 24 Aug 1999 23:23:51 EDT
In a message dated 08/24/1999 7:40:42 PM Pacific Daylight Time, gbl@.......
writes:
<< I picked up a fairly large regional event around 13:10 UTC 8/24/99. I
checked the live Internet seismic server and it shows up in New Mexico.
NEIS has a very short list at this time.It doesn't show up there. Has
anyone in California picked this event up?
Barry >>
It was on the NEIS list before it wigged out this morning.
M4.7 13:04 UTC location 51 miles south of Yuma, AZ
Mike
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Hypoellipse
From: Arie Verveer ajbv@............
Date: Wed, 25 Aug 1999 23:45:16 +0800
Hi, After a recent e-mail to the "PSN" list, I received three great answers to my question
relating to the location of an epicentre. Dr. John Lahr suggested that his program,
hypoellipse may be of interest. After setting the velocity model for my location and
inputting data for my station and two AutoDrm stations, the program calculated the
epicentre of a local quake, (within 0.002 of a degree!) and that is compared to an
"A" class position. The program is very flexible and I do recommend its use.
You will need to down load the files from :
http://lahr.org/iaspei/northam/ak/s_ak/programs/hypoel/hypoel.html
Thanks, Dr. John Lahr for this great resource.
Arie
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: NEW RESIA' SEISMIC WEB SITE
From: "Giovanni Rotta" rottag@..........
Date: Wed, 25 Aug 1999 22:27:42 +0200
Hi !
I have the pleasure to present to you the new seismic web site of my =
seismic station.
The new adress is http//www.resianet.org/ingssr.htm
Regards,
Giovanni=20
=20
Giovanni Rotta
Via F. Pizzigoni, 10
33010 Resia (Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
Hi !
I have the pleasure to present to you the new =
seismic web=20
site of my seismic station.
The new adress is=20
http//www.resianet.org/ingssr.htm
Regards,
Giovanni
Giovanni Rotta
Via F. Pizzigoni, 10
33010 =
Resia=20
(Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
Subject: SORRY... THE REAL NEW RESIA' SEISMIC WEB SITE
From: "Giovanni Rotta" rottag@..........
Date: Wed, 25 Aug 1999 22:39:17 +0200
Sorry!... A mistake in my e-mail... :-)))
The new adress in http//www.resianet.org/sismo01.asp
Regards,
Giovanni
Giovanni Rotta
Via F. Pizzigoni, 10
33010 Resia (Udine) I
Lat. 46.373 N Long. 13.305 E
rottag@..........
http://www.resianet.org/sismo01.asp
Sorry!... A mistake in my e-mail... =
:-)))
The new adress in=20
http//www.resianet.org/sismo01.asp
Regards,
Giovanni
Subject: R: Hypoellipse
From: "Francesco" franuc@......
Date: Thu, 26 Aug 1999 01:02:59 +0200
Hi Arie.
Some months ago I've downloaded the Hypoellipse, but I found a lot of =
difficulty to compile the program (I'm not so pratic in these =
programs......). =20
Certainly, this program is useful for the location of local events and I =
would try to use it for our Italian network. =20
Now, my great problem is to understand how to configure the station list =
(stations.dat ???) in according with the severlas parameters indicated =
in the explanation....(calibration, gain, ecc.ecc.....).
Which is the input file???? If possible to use our type of file (SDR or =
WQ) for Hypoellipse? If yes, how can I do?
And more: how can I modify the travel model?
I seem that you have used soon this programm without any difficult.
Can you help me ?????
From now, thank you very very much
Francesco
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=00
Subject: I: Hypoellipse
From: "Francesco" franuc@......
Date: Thu, 26 Aug 1999 15:49:02 +0200
John and Arie.
Some problem with the server for the last message....
I repost it.
Francesco
-----Messaggio Originale-----
Da: Francesco
A: PSN-L Mailing List
Data invio: giovedì 26 agosto 1999 1.02
Oggetto: R: Hypoellipse
Hi Arie.
Some months ago I've downloaded the Hypoellipse, but I found a lot of
difficulty to compile the program (I'm not so pratic in these
programs......).
Certainly, this program is useful for the location of local events and I
would try to use it for our Italian network.
Now, my great problem is to understand how to configure the station list
(stations.dat ???) in according with the severlas parameters indicated in
the explanation....(calibration, gain, ecc.ecc.....).
Which is the input file???? If possible to use our type of file (SDR or WQ)
for Hypoellipse? If yes, how can I do?
And more: how can I modify the travel model?
I seem that you have used soon this programm without any difficult.
Can you help me ?????
From now, thank you very very much
Francesco
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Hypoellipse
From: John Lahr lahr@...................
Date: Thu, 26 Aug 1999 09:19:53 -0600 (MDT)
Hello Francesco,
I would be happy to help you get hypoellipse going for your
local and regional seismicity. What platform (IBM PC or UNIX)
are you using? If PC or SUN UNIX then you will not need to
recompile the program.
The manual is quite fat, but if you print out Chapter 2 it
will help with many questions. This is not the easiest program
to run, so don't hesitate to ask me, also.
Good luck,
JCLahr
################################## John C. Lahr
################################# Seismologist
################################ U.S. Geological Survey
############################### Geologic Hazards Team, MS966
############################## PO Box 25046
#############################/##############################
############################/###############################
Denver, Colorado 80225-0046 ################################
Phone: (303) 273-8596 ##################################
Fax: (303) 273-8600 ###################################
lahr@........ #####################################
http://giseis.alaska.edu/lahr
http://lahr.org/john-jan
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Evans' reports
From: John Lahr lahr@...................
Date: Thu, 26 Aug 1999 11:13:00 -0600 (MDT)
Hi Doug,
As you read, John Evans is breaking some new ground with the
new acceleration sensors.
To get to the reports that John Evans mentioned, first
ftp andreas.wr.usgs.gov
Then
cd pub/outgoing/jrevans/OFR_98_109
for the first report, and
cd pub/outgoing/jrevans/OFR_98_586
for the second one.
I've also put PDF and MS WORD97 versions of the first report here:
http://geohazards.cr.usgs.gov/evans/ofr_98_109.html
Good luck with your monitoring!
JCLahr
******
>From: "John R. Evans"
>To: doug@.............
>Subject: Strong motion for Santa Cruz mountain home
Doug,
I have a design for a good but relatively inexpensive (ca.
$500 parts for three components) strong-motion sensor. You
will need four channels (the fourth for temperature) if you
use it. Do an old-fashioned anonymous ftp() to
andreas.wr.usgs.gov and retrieve either the PC (.zip) or the
Unix (.Z's) version of USGS Open-file Report 98-109 (design),
and possibly 98-586 (what we're doing with them in Oakland):
/ftp/pub/outgoing/jrevans/OFR_98_109
/ftp/pub/outgoing/jrevans/OFR_98_586
PEPP would be interesting and useful too (Susan Schwartz at
UCSC would like some teleseismic records, I'm sure, to look
at anisotropy) but strong-motion is my passion (and bias!).
The PEPP instrument will peg, I believe, for strong motion.
Either way, good luck.
--John
jrevans@........
Doug,
Just got down to your follow-up message, again forwarded to
me by John Lahr.
The ADXL devices are certainly adequate for shut-off valves
and a microcontroller with them could be used to trigger on
something more subtle than peak acceleration (peak velocity
is a better predictor of damage, for example). We would not
sneeze at records from them either, but they are rather noisy
by our standards and really only about a 9-bit sensor (when
comparing broadband peak-to-peak noise to a +/-2 g relevant
range in earthquakes ... well, some say +/-3 g is wiser very
close to a fault). Useful, but the design I sent you in the
previous e-mail is a true 16-bit sensor and therefore produces
much more valuable seismograms. It can be stretched beyond
the +/-2 g limit, but the maker does not guarantee linearity
(probably adequate to +/-2.5 g anyway).
My TREMOR Project is aimed at something similar to your sug-
gestion for a strong-motion instrument at many internet nodes.
It looks like the spatial variability of shaking requires an
instrument at least every km to get a decently accurate map
of shaking strength. We're currently using CDPD (cell phone
internet) but I have serious doubts about its reliability after
a big event (mainly because ground lines to the cell phone base
stations are vulnerable). A more robust private telemetry,
such as ISM spread spectrum, is a better long-term solution.
We are currently exploring a particularly interesting version.
Stay tuned.
Good luck,
John
jrevans@........
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: R: Hypoellipse
From: "Francesco" franuc@......
Date: Fri, 27 Aug 1999 01:12:16 +0200
I use a PC-dos.
Our network is based on eight stations all around Italy, equiped with 3
components (z 1hz, e/w n/s); Larry's ampli-board and a/d 16 bit; SDR and Wq
software.
I read chapter 2, but, until now I have not understod which file and how I
must modify it to accord the several parameters. About the input file?
Thank
Francesco
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: R: Hypoellipse
From: "Francesco" franuc@......
Date: Fri, 27 Aug 1999 01:12:16 +0200
I use a PC-dos.
Our network is based on eight stations all around Italy, equiped with 3
components (z 1hz, e/w n/s); Larry's ampli-board and a/d 16 bit; SDR and Wq
software.
I read chapter 2, but, until now I have not understod which file and how I
must modify it to accord the several parameters. About the input file?
Thank
Francesco
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Hypoellipse
From: Arie Verveer ajbv@............
Date: Fri, 27 Aug 1999 11:17:13 +0800
Hi Francesco,
I'm just a novice in getting it to work, but I'll Zip all the files that I used and write a
brief description on how it was approached. I'll be away for about day, but when
I get back I'll get the info together. In the mean time, I would suggest to copy all
the files relating to Hypoellipse for "DOS" from Dr. John Lahr's site. Especially
the "Quick start manual" (quikstrt.doc or quikstrt.pdf) and "Quickrun files". Placing
them in a separate folders.
See you in a day or so.
Arie
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: calibration: log decrement
From: S-T Morrissey sean@...........
Date: Fri, 27 Aug 1999 12:34:41 -0500 (CDT)
Rex,
Regarding your notes on calibrating yout SG sensors.
The "Manual of Seismological Observatory Practice" was a major
accomplishment at its release in 1970 and is still certainly a
very useful reference. However, as the editors note, it was being
updated even as it was being published, and some of the contents
have since been significantly updated. In particular, some of the
instrumentation specifications and formula were revised for the
WWNSS (worldwide network of standardized stations), so the information
in the WWNSS manual became preferred. The sections on record
content and earthquake parameter determination are quite good.
The instrumentation formulas involving galvanometers and coupling
circuits are obviously no longer applicable, but complicate the
basic seismometer formulas..
You asked about the "logarithmic decrement" mentioned in paragraph
4.1.3. I cannot verify the formulas found there, since they propose
be for using log(10), rather than the natural log ln, which is always
used to define the function, since the amplitude of the damped
oscillation decays as e^-hwnt.
This can be found in other seismic instrumentation notes
(Eaton, Kisslinger, Bullen (pg 148), as well as in:
"Advanced Engineering Mathematics": by Erwin Kreyszig. Pg115:
The ratio of two consecutive maximum amplitudes a1 and a2 of a damped
oscillation is constant. The natural logarithm of this ratio
is the logarithmic decrement d, where:
ln(a1/a2) = d = 2*pi*a/w*, where a = c/2*m and w* is omega*.
c being the damping constant, m the mass, and w* the damped period.
This method is used to determine the open-circuit damping of
seismometers. In the conventions of seismic instrumentation, where
h = the damping ratio to critical (h = 1 at critical)
(B, l or L is often used in place of h for the damping ratio)
a1/a2 = xm/x(m+1) = exp (2*pi*h/sqrt(1-h^2)), and
the decrement is then
d = ln(xm/x(m+1) = 2*pi*h/sqrt(1-h^2)
Often several successive zero-crossings are used to get a mean value.
Or several values of d are determined and averaged. Depends on your program.
So by determining the logarithmic decrement from a graph of
the output of an undamped seis, the actual open-circuit
damping can be determined.
h = d/sqrt(pi^2 + d^2) OR h =1/sqrt((pi/d)^2 +1)
From this the actual undamped natural period wn can be found,
since:
wn = wd/sqrt(1-h^2), where wd is measured from a graphic output
or by timing swings of the pendulum with a stopwatch.
With no damping wn = wd; damping decreases the frequency of oscillation.
In practice, the open-circuit damping of larger seismometers is
generally small, like 0.1 to 0.3. It is due to the piston effect of the
coils moving in the magnet gap, where clearances are significant to
allow for mechanical variations of the coil position.
If h or lambda = 0.3, wn = 1.05*wd,
So a 1 hz seis will be measured as 0.95 hz with ho = 0.3.
or considering the period T = 2*pi/w, Tn = Td*sqrt(1-h^2).
Tn = 0.954*Td, (h = 0.3)
So if the damped period is measured at 15 seconds with
a stopwatch, the actual period is 14.31 seconds.
If h = 0.1, Tn = 0.995*Td, or 15 sec Td is a Tn of 14.93,
which is within the accuracy of the measurement.
Damping lengthens the effective period. At h = 1, or critical damping,
Td is infinite since there is no oscillation.
A common application of using the logarithmic decrement to determine
the damping (h or l or lambda or B (beta):) if the damping is
changed by adding different parallel resistances to damp the coil,
the successive overshoot ratios and hence the log decrement will change;
the total damping Bt can be determined for each resistance and the motor
constant G can be determined.
G = sqrt(2*wn*m*(Rd + Rs)*(Bt - Bo)*10^-7) volts/cm/second.
where Rd is the test resistance resulting in the new Bt (total
damping), Rs is the coil resistance, and Bo is the open circuit
damping. m is in grams, wn = 2*pi*fn.
This is measured for several values of Rd that still allow the undamped
oscillation to be measured to determine the logarithmic decrement and
hence B.
Then the desired damping resistor is calculated by:
Bem = Bt - Bo, and usually a total damping of 1/2*sqrt(2)
( = 0.707) to 1 is desired).
Bem = G^2 / (2*omega*M*(Rs + Rd), or
Rd = [G^2 / (Bem*2*omega*m)] - Rs
Where Bem is the electromagnetic damping, G is the main coil
constant, omega is the angular frequency, equivalent to
2*pi/Tn, where Tn is the natural period, and M is the mass.
For an L4-C, with a 5500 ohm coil, with G = 270 V/m/sec, Bo = 0.27,
we want Bt to be 0.77, so Bem = 0.5, M = 1 kgm, omega = 2*pi, we
calculate a damping resistor Rd of 6102 ohms for critical damping (0.7).
For an S5000 Long Period Seis, with a 500 ohm coil, G = 100 V/m/sec,
Bo = 0.1, we want a flatter response with Bt = 1, so Bem = 0.9,
omega = 2*pi/15 (seconds), M = 11 kg, we calculate a resistor of
705 ohms for Bt = 1 (the LP is over damped for a broader response).
Other topics like determining the static magnification (the sensitivity
to a DC or zero-frequency signal) are really not applicable to modern
electronic seismic recording. The method can be used to determine the
sensitivity of a displacement transducer in a VBB instrument if a
suitable micrometer is not available.
SOOOOOO........
How do I calibrate a seismometer???????.
............... see my next email ........
Regards,
Sean-Thomas
References: .........
Benioff,H., "Earthquake Seismographs and Associated Instruments",
Advances in Geophysics, vol 2, 1955, p219-275.
Bullen K.E., "An Introduction to the Theory of Seismology", Cambridge
University Press, London, 1965 (365 page book)
Eaton,J, Theory of the Electromagnetic Seismograph, BSSA (Bulletin of the
Seismological Society of America),#47, p37-76, 1957
Kisslinger, C., "Lecture Notes on Seismological Instrumentation", UNESCO
and IISEE, International Institute of Seismology and Earthquake Engineering,
Tokyo, Japan, 1967.
Scherbaum, Frank, "Of Poles and Zeros: Fundamentals of Digital Seismology",
Kluwer Academic Press, Dordrecht, Netherlands; 1996, ISBN 0-7923-4012-4
_____________________
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Need help with SDR
From: Nick & Sophie Caporossi nickcap@.............
Date: Fri, 27 Aug 1999 22:37:01 -0400
Hi Larry and all.
I transferred sdr to an other computer.
The problem is: When I'm in SDR, using the "cntl and D" keys it does not
put me into the temporary DOS mode. The "cntl and D" key flash momentarily
and do nothing else.
Am at a loss to know how to view a Replay file, to view in Winquake with
out exiting Sdr.
The new machine is 486 dx2x80 with 278meg hard drive 36meg Ram with a 7.0
Dos installed. I installed sdr22 and then updating with sdr262. It still
did not operate correctly. I don't have this problem with an of my other
computers.
Any help will be greatly appreciated.
Thanks
Nick
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: STM-8 SETTINGS
From: RADIOTEL@.......
Date: Sat, 28 Aug 1999 00:28:37 EDT
SEAN-THOMAS
As I shared with you previously, I have my velocity model ( coil and magnet )
STM-8 seismo working. However, I have tried many combinations of weights and
distance from the hinges to the flexture bars - but my best period thus far
is about 4.5 sec. I presently have the distances from the hinges to the top
and bottom flextures as reflected in your drawings. Any suggestions to
assist me obtaining an eight second period or longer would be appreciated.
Jim Allen
Cerritos, CA
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Need help with SDR
From: barry lotz gbl@.......
Date: Fri, 27 Aug 1999 21:50:46 -0700
Hi
I'm having the same problem. I think it may have something to do with
available memory but am not sure.
Barry
Nick & Sophie Caporossi wrote:
> Hi Larry and all.
> I transferred sdr to an other computer.
> The problem is: When I'm in SDR, using the "cntl and D" keys it does not
> put me into the temporary DOS mode. The "cntl and D" key flash momentarily
> and do nothing else.
>
> Am at a loss to know how to view a Replay file, to view in Winquake with
> out exiting Sdr.
>
> The new machine is 486 dx2x80 with 278meg hard drive 36meg Ram with a 7.0
> Dos installed. I installed sdr22 and then updating with sdr262. It still
> did not operate correctly. I don't have this problem with an of my other
> computers.
> Any help will be greatly appreciated.
>
> Thanks
>
> Nick
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: STM-8 SETTINGS
From: S-T Morrissey sean@...........
Date: Sat, 28 Aug 1999 00:03:06 -0500 (CDT)
Jim,
I can only guess that the total spring constant of the spring, its
flexures, and the main hinges is too large. I am presently using
hinges that are 0.005" thick and 3/8 inch wide. The free, non-contacting
area where the hinges cross to the frame angles is about 1/16".
As I move the upper contact point of the main leaf spring along the
boom closer to the hinges, adjusting the mass position accordingly,
I can reach a point of infinite period or instability. The range of
adjustment (moving along the boom) from several seconds to over ten
seconds is only about 1 cm.
Also, the level of the boom affects the period. As the instrument is
tilted back, raising the mass end of the boom, the period lengthens.
This is reducing the gravity vector and direction of the forces at the
hinge. Obviously, tilt it too far, and it will flop over.
Hope this helps. Maybe someone else has some suggestion.
Regards,
Sean-Thomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Edward Cranswick in Turkey
From: meredith lamb psnseismograph52@..........
Date: Fri, 27 Aug 1999 23:09:52 +0000
Hi,
Anybody heard from Edward Cranswick in Turkey yet? He
left last Friday....just wondering.... Probably incredibly busy
I imagine.
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Need help with SDR
From: Larry Cochrane cochrane@..............
Date: Sat, 28 Aug 1999 01:01:36 -0700
Nick,
The problem, as Barry pointed out, is with the amount of memory available
to run another copy of DOS. The first thing to try is running memmaker at
the DOS prompt. This may free up enough memory. This utility, available in
higher version of DOS and Win95/98, moves some of the drivers, and the
first copy of DOS, into memory above 640K. This frees up memory below 640k
to run another copy of DOS.
Also, make sure you have selected the same sample rate and number of
channel to records. Increasing either will use more memory.
-Larry Cochrane
Redwood City, PSN
At 10:37 PM 8/27/99 -0400, Nick & Sophie Caporossi wrote:
>Hi Larry and all.
> I transferred sdr to an other computer.
>The problem is: When I'm in SDR, using the "cntl and D" keys it does not
>put me into the temporary DOS mode. The "cntl and D" key flash momentarily
>and do nothing else.
>
>Am at a loss to know how to view a Replay file, to view in Winquake with
>out exiting Sdr.
>
>The new machine is 486 dx2x80 with 278meg hard drive 36meg Ram with a 7.0
>Dos installed. I installed sdr22 and then updating with sdr262. It still
>did not operate correctly. I don't have this problem with an of my other
>computers.
> Any help will be greatly appreciated.
>
>Thanks
>
>Nick
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Hypoellipse
From: Arie Verveer ajbv@............
Date: Sat, 28 Aug 1999 21:36:34 +0800
Hi Francesco,
Please take note that I'm just a novice in using Hypoellipse. So my description
on the way the program is used may be questionable. Anyhow, here goes.
It should be noted the file names can be different from the one's used here.
(I'll call them the same as the manual file names.)
1)
The first thing is to copy all the "DOS" and "Documents" files form
Dr. John Lahr's great site.
http://lahr.org/iaspei/northam/ak/s_ak/programs/hypoel/hypoel.html
Its best to place each individual section in a separate folder. Its important for this
example to copy all the "Quickrun" files to a new "quickrun folder". Make a backup
of this folder.
2) Print out the Quick-Start manual.
3) (Read chapter on "crustal.prm" )
In the "Quickrun folder" load the file called "crustal.prm" into a text editor. You
need to modify this "VELOCITY" file for your location. I'll give you the data I have
used but you will need to talk to Dr. Lahr or you local Geophysical Observatory and
get the velocity of the "P" and "S" waves at various depths around you location.
In My area its 6.13 Km/sec for a P wave at 0 Km Depth.
7.14 Km/sec for a P wave at 19 km Depth
8.27 Km/sec for a P wave at 36.0 km Depth
In My area its 3.62 Km/sec for a S wave at 0 Km Depth.
3.96 Km/sec for a S wave at 19 km Depth
4.75 Km/sec for a S wave at 36.0 km Depth
Now calculate the (Vp/Vs) data for each depth.
0 Km Depth is (6.13/3.62) = 1.69
19 Km Depth is (7.14/3.96) = 1.80
36 Km Depth is (8.27/4.75) = 1.74
Your model may have different depths but the principle is the same.
Using the information from the "quickrun" manual modify the opened
file "crustal.prm" to reflect the velocity model data. Note the column
spacing. It Should look someting like this for my area.
! Model 1: Western Australia
!
VELOCITY 6.13 0.0 1.69
VELOCITY 7.14 19.0 1.80
VELOCITY 8.27 36.0 1.74
Close and save the file.
4) Input Data. Its important to follow the manual and watch your column spacing.
For each seismic station you should calculate, using "Winquake" an arrival time
of the "P" wave or the "S" wave or both waves. Accuracy, depends on how good your
data is and how many stations you have. Not less than three stations.
I used my station plus two AutoDrm stations.
BICK station P arrival is 1:46:38.5 On 99/07/13
S arrival 1:46:56.6
FORT station P arrival is 1:48:22.4 On 99/07/13
S arrival 1:49:59.5 - Very Poor data
MEEK station P arrival is 1:47:22.9 On 99/07/13
S arrival 1:48:14.8
I also calculated the amplitude of the wave data, but its not used in this
example. Magnitude is a bigger problem and wont be considered in this example.
"Winquake" gives a very good estimate on the magnitude when the right corrections
are entered.
Amplitude BICK 5660
FORT 376
MEEK 1319
In the "Quickrun folder" load the file called "akutan.pha" into a text editor. You
need to modify this file for your Input Data. Again I'll give you the data from my
station plus the two AutoDrm stations. Armed with the arrival time data and your
"quickrun" manual; the modified "akutan.pha" file should look something like this.
BICKIP 9907130146 3850 5660 4121
FORTEP 9907130148 2240 11950 376
MEEKEP 9907130147 2290 7480 1319
C* YrMoDyHrMn P-Sec S-Sec Amp
C*(F) 960423065129i.
C*(C) Any record starting with C* is a comment.
Make sure the columns are correct. The printout here may not reflect the correct
column spacing.
Close and save the file. You have now set the velocity Model and input data for
a particular quake.
5) Station Locations.
In the "Quickrun folder" load the file called "akutan.sta" into a text editor. You
need to modify this file for your station Input Data. Again I'll give you the data
from my station plus the two AutoDrm stations.
BICK -32.008 Latitude by 116.135E Longitude 300 Meteres above Mean sea level.
FORT -30.778 by 128.059E 165
MEEK -26.638 by 118.615E 530
So BICK is -32 degrees 00.48 minutes south by 114 degees 08.10 minutes east
FORT -30 46.68 128 03.54
MEEK -26 38.28 118 36.90
Armed with the station location's and your "quickrun" manual. The "akutan.sta" file
should look something like this.
BICK32S00.48 116E08.10 300
BICK* 18
FORT30S46.68 128E03.54 165
FORT* 18
MEEK26S38.28 118E36.90 530
MEEK* 18
Save and close the file.
6) Seismograph amplitude response.
I entered this data since I had it available, its need for magnitude calculation.
I'm going to do this later.
In the "Quickrun folder" load the file called "caldata.prm" into a text editor. You
need to modify this file for your seismograph amplitude response. Again I'll give
you the data from my station plus the two AutoDrm stations. The file should look like
this. Check the manual for column layout.
BICK D 980713 999999 1 1.00 400000.
FORT D 980713 999999 1 1.00 591716.
MEEK D 980713 999999 1 1.00 680272.
Save and close the file.
7) Options. Hypoellipse allows many, many options is the way it process data.
I changed these parameters so it approached the reduction in the way I like
it to. You will need to printout the full manual to see the options. See
page 2-23 "Big manual". Maybe for this exercise just print out the relevant
part of the manual. (2-23 -> 2.29)
In the "Quickrun folder" load the file called "headopts.vol" into a text editor. You
need to modify this file for your various options. In this case I'll give my selection
and why. I'm a novice in all of this so shot me down, with compassion.
Options and Why
! Options - control file
header content Bickley Western Australia ! Run Name
reset test 1 1.69 !Ratio P/S wave velocity **
reset test 2 6.13 !P wave velocity **
reset test 3 -31.0 !First Trial Latitude **
reset test 4 -117.0 !First Trial Longitude **
reset test 5 -1.0 !First trial depth
reset test 6 -1.0 !RMS See page 2-24
reset test 8 0.0 !Top of Model, respect to sea level **
reset test 21 20. !Maximum nuber of iteration allowed (important)
reset test 22 1.0 !Limit chang of focal depth (km) **
reset test 31 -0.87 !C1 constant (magnitude) **
reset test 32 2.0 !C2 constant (magnitude) **
reset test 33 0.0035!C3 constant (magnitude) **
! end of headopts.vol
NOTE: the Lines ending with "**" aren't really needed in this epicentre location example.
Anyhow the new "headopts.vol" should look like this.
! Options - control file
header content Bickley Western Australia
reset test 1 1.69
reset test 2 6.13
reset test 3 -31.0
reset test 4 -117.0
reset test 5 -1.0
reset test 6 -1.0
reset test 8 0.0
reset test 21 20.
reset test 22 1.0
reset test 31 -0.87
reset test 32 2.0
reset test 33 0.0035
! end of headopts.vol
Save and close the file.
8) Input control file. (Hypo.ctl) This file controls which files are used and controls.
In the "Quickrun folder" load the file called "hypo.ctl" into a text editor. You
need to modify this file for your file name and options. (Example)
It should look something like this.
! headopts.vol contain the setup parameters
! for running HYPOELLIPSE.
jump headopts.vol
!
! crustal.prm specifies the velocity model.
jump crustal.prm
!
! caldata.prm contains the calibration parameters.
uofacal option caldata.prm
!
! Constants noprint = 1 will cause documentation of the
! parameter values, crustal model, station locations, etc
! to be added to the output (.out) file. Note that if the
! same parameter value it specified more than once, the last
! setting will be the one used (in this case the value will
! be set to 1).
constants noprint 0
constants noprint 1
!
! Printer option 1 adds a blow by blow description of
! every iteration step and is useful for debugging purposes.
! Reverse the order of the following records to turn this
! option on.
printer option 1
printer option 0
tabulation option 4
!
begin station list +1 19960101
jump akutan.sta
arrival times next
jump akutan.pha
Save and close the file.
You will need to consult the "Big Manual" for a full explenation of this file.
--------------------------------------------
The files (akutan.sta, crustal.prm, caldata.prm, and headopt.vol ) once set shouldn't
need to be changed for other events.
9)
Copy the file "Hypoel.ex" into your quickrun folder and rename it "Hypoel.exe".
At this point I recommend to close all other windows except the "quickrun" folder.
10) Lets give it a go!!
Open an "Msdos" Window. I recommend a window and not the full screen. See "MsDos" prompt,
properties. In the "MsDos" window change the directory until you are in the "quickrun"
folder. At the prompt, type.
hypoel < hypo.in (and hit the return key)
If all goes well you should see some new files in the "quickrun" folder. Look at the
"Hypoel.out" file with a text editor and see the program process and reduction.
Hopefully you should see the quakes location at
99/07/13 01:46:13.6 UT -31.21 latitude (-31 degrees 12.6 minutes)
117.48 East (117 degrees 28.8 minutes)
3 km Depth.
Or something close to this "A" accuracy position. More data means more accuracy!
If you want to re-compute this run with some modifications then you will need to delete
the previously generated output files. Go to the "MsDos" window and repeat the line
hypoel < hypo.in (and hit the return key)
Francesco, I hope this is of help and I'll send you these files in a "ZIP".
Again I wish to thank Dr. John Lahr for this great resource.
Have Fun. I did.
Arie
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Hypoellipse
From: The Lahrs JohnJan@........
Date: Sat, 28 Aug 1999 08:17:47 -0600
Hi Arie,
Wow, what a great tutorial for running Hypoellipse! Would you mind if
I include this along with the program on the web site? I will give it
the title:
Short tutorial written by Arie Verveer on running
Hypoellipse on a PC for the first time.
Thanks!
John
At 09:36 PM 8/28/99 +0800, you wrote:
>Hi Francesco,
>
>Please take note that I'm just a novice in using Hypoellipse. So my
>description ......
* John C. and Jan H. Lahr *
* JohnJan@........ *
* 1925 Foothills Road *
* Golden, Colorado 80401-1718 *
* (303) 215-9913 *
* http://lahr.org/john-jan *
* http://giseis.alaska.edu/lahr *
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Edward Cranswick in Turkey
From: Mustafa Erdik earthquake@...............
Date: Sat, 28 Aug 1999 17:48:14 +0100
Hi,
Ed is working in the field with us. He is fine and healthy.
Regards,
Mustafa Erdik
At 11:09 PM 8/27/99 +0000, you wrote:
>Hi,
>
>Anybody heard from Edward Cranswick in Turkey yet? He
>left last Friday....just wondering.... Probably incredibly busy
>I imagine.
>
>Meredith Lamb
>
>
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
>
Mustafa Erdik
Professor and Chair, Department of Earthquake Engineering
Kandilli Observatory and Earthquake Engineering, Bogazici University
81220 Cengelkoy, Istanbul, Turkey
e-mail: erdik@............ earthquake@...............
Web: http://www.koeri.boun.edu.tr/earthqk/earthqk.html
Fax: +90.216.308.0163, +90.216.332.1711
Tel: (Bus.) +90.216.332.6560, +90.216.332.9701; (Home) +90.216.339.8633
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Need help with SDR, thanks
From: Nick & Sophie Caporossi nickcap@.............
Date: Sun, 29 Aug 1999 00:07:35 -0400
Thanks Barry and Larry:
The second hand computers I got from a computer show has most of the
memory un enabled. Getting to the setup was quite a task. It was protected
by a password. Had to take the computers apart and hunt around for the
jumper straps to bypass the password. Should be home free now. I may remove
command file and install Windows95 and take it from there.
Thanks for the tip.
Nick
At 01:01 AM 8/28/99 -0700, you wrote:
>Nick,
>
>The problem, as Barry pointed out, is with the amount of memory available
>to run another copy of DOS. The first thing to try is running memmaker at
>the DOS prompt. This may free up enough memory. This utility, available in
>higher version of DOS and Win95/98, moves some of the drivers, and the
>first copy of DOS, into memory above 640K. This frees up memory below 640k
>to run another copy of DOS.
>
>Also, make sure you have selected the same sample rate and number of
>channel to records. Increasing either will use more memory.
>
>-Larry Cochrane
>Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: [Fwd: calibration: log decrement]
From: "Rex Klopfenstein, Jr." rklopfen@.........
Date: Sun, 29 Aug 1999 15:00:18 -0400
Thanks for the info. Will take sometime to ingest and some trips to the library. By
the way, the references really helps!!!
> Rex,
>
> Regarding your notes on calibrating yout SG sensors....
>
--
Rex Klopfenstein, Jr.
Bowling Green, OH
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: USGS 150th Anniversary open house photos
From: meredith lamb psnseismograph52@..........
Date: Sun, 29 Aug 1999 14:03:17 +0000
Hi everyone,
Now have on a website some 86 photos on 15 pages of the
150th anniversary open house exhibits shown at the NEIC in
Golden Colorado, and the Federal Center in Lakewood,
Colorado on August 28th 1999.
I would say it seemed to be a huge success, what with perhaps
thousands of people visiting both places. The USGS really put
up a large number of exhibits and went all out on a large number
of subjects they are involved with.
http://members.xoom.com/seismogram/page32.html
.....will get you started. Xoom seems to occasionally drop pictures
and initially somewhat slow loading; you may have to reload
sometimes to see them all. This is a what you see is what you get
Netscape Composer program, so, the html, may not function
perfectly.
.........................
Note....I'll be switching USWest addresses soon, so, the Xoom
site will be the primary for me for some time:
http://members.xoom.com/seismogram/
Enjoy the pictures....it was alot of fun at the open house.
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Murphys law....USGS site photos?
From: meredith lamb psnseismograph52@..........
Date: Sun, 29 Aug 1999 18:01:08 +0000
Hi all,
Yes...I do note the Xoom site seems to be down. The general
notes indicates a number of servers are not working right at
this time. Overall, this doesn't seem to be unusual per my
experience with Xoom.com. Suggest you try sometime in the
future again. Its a free web site, and has some 7 million members,
so problems aren't too scarce...ha.
It seemed to have gone down about 10 minutes after the first
email notice of the USGS photos....murphys law prevails....
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Murphys law....USGS site photos?
From: Raul Alvarez ralvarez@........
Date: Sun, 29 Aug 1999 18:13:22 -0600
Meredith,
When I try to go to your site, I get the following message:
"Forbidden
You don't have permission to access /s/e/seismogram/ on this server."
Raul
meredith lamb wrote:
> Hi all,
>
> Yes...I do note the Xoom site seems to be down. The general
> notes indicates a number of servers are not working right at
> this time. Overall, this doesn't seem to be unusual per my
> experience with Xoom.com. Suggest you try sometime in the
> future again. Its a free web site, and has some 7 million members,
> so problems aren't too scarce...ha.
>
> It seemed to have gone down about 10 minutes after the first
> email notice of the USGS photos....murphys law prevails....
>
> Meredith Lamb
>
> _____________________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email listserver@.............. with the body of the
> message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Murphys law....USGS site photos?
From: Larry Cochrane cochrane@..............
Date: Sun, 29 Aug 1999 22:00:05 -0700
Hmmm the phrase "you get what you pay for" comes to mind....
-Larry
At 06:01 PM 8/29/99 +0000, you wrote:
>Hi all,
>
>Yes...I do note the Xoom site seems to be down. The general
>notes indicates a number of servers are not working right at
>this time. Overall, this doesn't seem to be unusual per my
>experience with Xoom.com. Suggest you try sometime in the
>future again. Its a free web site, and has some 7 million members,
>so problems aren't too scarce...ha.
>
>It seemed to have gone down about 10 minutes after the first
>email notice of the USGS photos....murphys law prevails....
>
>Meredith Lamb
>
>
>
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: PSN - Increase in noise
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Mon, 30 Aug 1999 13:43:42 -0400
I have two S-G seisms running and everything was fine. I had the
amplifiers adjusted to display about +/-100 counts of background noise.
Sunday (8/29/99) I turned on the monitor on my SDR computer. All
channels (HI/LO on both N/S and E/W) are somewhat more noisy. The
average values are now about +/-300 to 400 counts.
I retrieved a block of data from my N/S channel during a quiet time
(2:00am LOCAL). I then switched to the FFT screen and noted a peak at
0.12 on LOG(f) scale (x axis). I assume that the scale is log base 10
of frequency or 0.12 = approx 1.3 Hz??
Would this increase in noise be caused by the hurricane on the East
Coast (I am located in NW Ohio). I remember seeing something on this
list sometime ago, but can't remember if there was a characteristic
frequency of this hurricane noise.
If the hurricane isn't doing it, it's time for some detective work!!
Any help would appreciated before I start looking for gremlins!!!
--
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: PSN - Increase in noise
From: "Kevin Mackey" mackeyke@.............
Date: Tue, 31 Aug 1999 14:41:55 -0400
Rex,
I suspect that the hurricane might be your problem. I am located in
East Lansing, MI - operating station LNSM (not a PSN station). We currently
are seeing noise levels approximately 10X normal background in the 0.2 Hz
range. This is normal for us whenever there is a hurricane or large storm
off the east coast. At times, the noise here has increased about 50X due to
hurricanes. So, I would suggest waiting until the hurricane passes and see
if your noise levels go down.
If anyone has any references for coastal storm induced noise for
stations far inland, it might be helpful for additional information.
Kevin Mackey
Michigan State University
----- Original Message -----
From: Rex Klopfenstein, Jr
To:
Sent: Monday, August 30, 1999 1:43 PM
Subject: PSN - Increase in noise
> I have two S-G seisms running and everything was fine. I had the
> amplifiers adjusted to display about +/-100 counts of background noise.
> Sunday (8/29/99) I turned on the monitor on my SDR computer. All
> channels (HI/LO on both N/S and E/W) are somewhat more noisy. The
> average values are now about +/-300 to 400 counts.
>
> Would this increase in noise be caused by the hurricane on the East
> Coast (I am located in NW Ohio). I remember seeing something on this
> list sometime ago, but can't remember if there was a characteristic
> frequency of this hurricane noise.
>
> If the hurricane isn't doing it, it's time for some detective work!!
>
> Rex Klopfentein, Jr.
> rklopfen@.........
> http://www.wcnet.org/~rklopfen
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: PSN - Increase in noise
From: meredith lamb psnseismograph52@..........
Date: Mon, 30 Aug 1999 12:49:59 +0000
"Rex Klopfenstein, Jr" wrote:
> I have two S-G seisms running and everything was fine. I had the
> amplifiers adjusted to display about +/-100 counts of background noise.
> Sunday (8/29/99) I turned on the monitor on my SDR computer. All
> channels (HI/LO on both N/S and E/W) are somewhat more noisy. The
> average values are now about +/-300 to 400 counts.
>
> I retrieved a block of data from my N/S channel during a quiet time
> (2:00am LOCAL). I then switched to the FFT screen and noted a peak at
> 0.12 on LOG(f) scale (x axis). I assume that the scale is log base 10
> of frequency or 0.12 = approx 1.3 Hz??
>
> Would this increase in noise be caused by the hurricane on the East
> Coast (I am located in NW Ohio). I remember seeing something on this
> list sometime ago, but can't remember if there was a characteristic
> frequency of this hurricane noise.
>
> If the hurricane isn't doing it, it's time for some detective work!!
>
> Any help would appreciated before I start looking for gremlins!!!
> --
> Rex Klopfentein, Jr.
> rklopfen@.........
> http://www.wcnet.org/~rklopfen
>
Rex,
Don't think anything is unusual on your end....the hurricane
microseisms are hitting me hard here too. Need to increase
the trigger level here...probably as well there...its set it off
afew times since yesterday when it started building up with
time.
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Microseisms from hurricane Dennis
From: RLLaney@.......
Date: Mon, 30 Aug 1999 18:16:27 EDT
For the past 2 days, I have been observing microseisms gradually increasing
in amplitude as hurricane Dennis moves northward along the Atlantic coast.
Periods are in the 4 to 6 second range. The amplitude was so great this
morning that I had to increase the alarm threshold to keep from recording
unwanted files.
I would be interested in hearing from others who are, or who are not,
receiving these microseisms and how far westward they can be detected.
Thanks.
Bob Laney
Herndon, VA
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Microseisms from hurricane Dennis
From: twleiper@........
Date: Mon, 30 Aug 1999 19:10:01 -0400
Our background level here in Stamford CT is running about 40X normal
thanks to Dennis the Menace.
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: PSN - Increase in noise
From: "Rex Klopfenstein, Jr" rklopfen@.........
Date: Mon, 30 Aug 1999 21:16:56 -0400
If I would have looked at WinQuake closer I would have seen that the scale is
in frequency just scaled to LOG!!! Therefore I am seeing about 0.12 Hz noise
peak.
"Rex Klopfenstein, Jr" wrote:
> ... I then switched to the FFT screen and noted a peak at
> 0.12 on LOG(f) scale (x axis). I assume that the scale is log base 10
> of frequency or 0.12 = approx 1.3 Hz??
> --
Rex Klopfentein, Jr.
rklopfen@.........
http://www.wcnet.org/~rklopfen
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Autodrm calibration
From: barry lotz gbl@.......
Date: Mon, 30 Aug 1999 19:29:33 -0700
Just a thought--
Autodrm stations have calibration info included with the files
requested (eg 0.12 nm/count). If I choose a station near mine and
record an event in the same direction (ie N,E or Z) then could I compare
my station response both in frequency and amplitude? I realize local
effects would have an effect on results. For example, if the event is of
similar distance from me as an autodrm station with gain of 0.2
nm/count, if my amplitude is higher, would it indicate my gain is also
higher? (possibly in a linear fashion?)
Barry
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Microseisms from hurricane Dennis
From: Larry Cochrane cochrane@..............
Date: Mon, 30 Aug 1999 20:16:59 -0700
At 06:16 PM 8/30/99 EDT, you wrote:
>For the past 2 days, I have been observing microseisms gradually increasing
>in amplitude as hurricane Dennis moves northward along the Atlantic coast.
>Periods are in the 4 to 6 second range. The amplitude was so great this
>morning that I had to increase the alarm threshold to keep from recording
>unwanted files.
>
>I would be interested in hearing from others who are, or who are not,
>receiving these microseisms and how far westward they can be detected.
The microseismic activity has not increased here...
-Larry Cochrane
Redwood City, PSN
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: 6-second microseisms
From: S-T Morrissey sean@...........
Date: Mon, 30 Aug 1999 23:57:18 -0500 (CDT)
Re microseisms from hurricane Dennis:
Here at St. Louis the level of the 6-second microseisms as recorded
from the STM8 broadband in the basement had increased by a factor of 10 over
the previous week. THe peak level from the VBB was about 20 millivolts.
With a broadband sensitivity of 5.29 mv/micron/second, this indicates
a peak velocity of 3.4 microns/second. At a period T of 6 seconds,
the angular frequency is w =2*pi/T, or 1.05*sec^-1. The velocity is
divided by w to give a peak displacement of 3.6 microns.
Here are some notes I have previously posted:
Re: 6-second microseisms and hurricanes:
An interesting phenomenon in the eastern USA is that when a large
wind storm due to a deep barometric low occurs off the east coast,
particularly off of New England, the wave energy pounding on the
continental shelf propagates through the lithosphere under the
eastern USA as a 6-second surface wave, at about half the period of
the oceanic wave. This is also true of any storm off the east
coast, except that the period will be different, varying from 4 to
10 seconds. Storms off the southwest coast cause a longer storm wave,
but the predominant energy is still from 5 to 8 seconds.
This storm microseism noise is the major reason that the original
global seismograph stations were configured as two separate instruments:
a SP or short-period, peaking in gain at about 1 second, at 50k to 100k,
and the LP, or long-period, peaking at 15 to 30 seconds, with magnifications
from 1.5k to 6k. During a microseism storm, even the LP record could be
a scribbled mess; usually the storm peak would only last for a several
hours, so we wouldn't interrupt the recording.
With the advent of wide dynamic range digital recording and VBB response
instruments, we deal with the microseisms in later digital processing.
However, for a visible monitor record on a drum recorder, we usually
use a "twin-T" notch filter to reduce the microseisms by 40db (1/100).
The twin-T is passive and easy to make with 3 resistors and 4 capacitors.
Even with the filter, a strong storm can fill the record with noise, which
is easily seen as 10 waves per minute.
A historical note on tracking hurricanes before the use of
satellites and aircraft: small seismograph arrays were used.
At our old station FLO outside St. Louis, two additional small
vaults were built 1/4 mile west and north of the main vault.
THen intermediate period (10 second) seismometers were used,
connected to 6-second galvanometers for photo recording with a
peak response at 6-seconds.
THe relative phase of the microseisms crossing the L shaped
array provided a vector pointing toward the origin if the waves.
It was much more accurate than 3-component particle motion analysis.
With several such stations (one was at Spring Hill, AL, another at
Rochester, NY) providing a pointer, the location of the hurricane
could be estimated, even when hundreds of km from shore.
There are some examples of the spectral noise from microseisms on
my web page featuring figures and data; there is even an example of
a storm peak from a hurricane last year.
http://www.eas.slu.edu/People/STMorrissey/index.html
Regards,
Sean-Thomas
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Automatic E-mailed earthquake files.
From: Arie Verveer ajbv@............
Date: Tue, 31 Aug 1999 14:08:20 +0800
Hi
Lately I've been working on a way to send the "SDR" quake files automatically via email.
The reason is, my station is located in a basement some 11 km from home and that meant
a weekend trip to "SDR" to retrieve the data. Anyhow the following method has been
developed to "check and send" any new "SDR" quake files on the hour, to an e-mail
address.
1)
You need a "SDR" logging computer networked to a another computer. That computer
has to be connected to a "ISP" via a modem or some other network connection.
2)
Set-up "SDR" to save the event files to the networked computer as per "Winquake"
instructions.
On the network computer I installed some server software for "windows" called
"Sambar 4.2.9" It runs in the background and is so easy to install. There is a
charge to get the professional version. (professional - mail, ftp, tenet ) servers.
The rest is easy; set-up the server scheduler to run a "CGI" on the hour. This "CGI"
is essentially a small program that checks the "SDR" files and looks for a new entry.
If data is found, it's e-mailed via a server program called "mailit.exe".
This a "DOS" program that can send email. This "mailit.exe" program sends the e-mail
to the server mailing program and that in turn sends it to e-mail address. It's done this way
so you could "forward" the mail to other interested people.
I have a permanent "mail" connection to the internet world via the networked computer.
But the server software allows for "Dial-On-Demand".
You must have some familiarity with "TCP/IP" to get things going. If anyone's interested then
I can send you the source "C" code for the "CGI". Its really simple.The code is first draft and
can be improved.
It should be remembered that the e-mailed data is "RAW" data and may only be a false trigger.
Also I'm working on a variant of this "CGI" for quick notification. But that is very specific
and
involves another computer(?).
Regards
Arie
ajbv@............
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Microseisms from hurricane Dennis
From: "Charlie Rond" rond@................
Date: Tue, 31 Aug 1999 01:34:45 -0500
Bob,
>For the past 2 days, I have been observing microseisms gradually increasing
>in amplitude as hurricane Dennis moves northward along the Atlantic coast.
>Periods are in the 4 to 6 second range. The amplitude was so great this
>morning that I had to increase the alarm threshold to keep from recording
>unwanted files.
>
>I would be interested in hearing from others who are, or who are not,
>receiving these microseisms and how far westward they can be detected.
The same thing has been happening here in Memphis, TN. I was so fascinated
watching them, I didn't think to change the threshold. This evening while I
was gone, the program screeched to a halt as the hard drive filled up with
"events"! They are the largest microseism I've ever recorded!
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: USGS open house photos...again...
From: meredith lamb psnseismograph52@..........
Date: Tue, 31 Aug 1999 09:08:58 +0000
Hi all,
Trying again..... I put the USGS open house photos on another
web site. Hopefully it will work somewhat better, and faster.
The Xoom com site seems to be getting worse with time, and
patch attempts.
http://www.geocities.com/ResearchTriangle/Facility/1739/page47.html
Yahoo/Geocities has had its long period of troubles also, but seems
to be somewhat better. You may need to reload sometimes.
There is a pop up ad, but moving it somewhat out of the way
initially, will prevent having to delete it with every page you see.
Depending on your computer speed of loading, viewing all could
consume quite some time.
The site also contains all the rest of my original files:
http://www.geocities.com/ResearchTriangle/Facility/1739/index.html
Thanks,
Meredith Lamb
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: 6-second microseisms
From: "Mark & Lori" mlpg@.................
Date: Tue, 31 Aug 1999 10:33:01 -0700
Can you please take me off your address list? Thank you
----------
>From: S-T Morrissey
>To: psn-l@..............
>Subject: 6-second microseisms
>Date: Mon, Aug 30, 1999, 9:57 PM
>
>Re microseisms from hurricane Dennis:
>
>Here at St. Louis the level of the 6-second microseisms as recorded
>from the STM8 broadband in the basement had increased by a factor of 10 over
>the previous week. THe peak level from the VBB was about 20 millivolts.
>With a broadband sensitivity of 5.29 mv/micron/second, this indicates
>a peak velocity of 3.4 microns/second. At a period T of 6 seconds,
>the angular frequency is w =2*pi/T, or 1.05*sec^-1. The velocity is
>divided by w to give a peak displacement of 3.6 microns.
>
>Here are some notes I have previously posted:
>
>Re: 6-second microseisms and hurricanes:
>
>An interesting phenomenon in the eastern USA is that when a large
>wind storm due to a deep barometric low occurs off the east coast,
>particularly off of New England, the wave energy pounding on the
>continental shelf propagates through the lithosphere under the
>eastern USA as a 6-second surface wave, at about half the period of
>the oceanic wave. This is also true of any storm off the east
>coast, except that the period will be different, varying from 4 to
>10 seconds. Storms off the southwest coast cause a longer storm wave,
>but the predominant energy is still from 5 to 8 seconds.
>
>This storm microseism noise is the major reason that the original
>global seismograph stations were configured as two separate instruments:
>a SP or short-period, peaking in gain at about 1 second, at 50k to 100k,
>and the LP, or long-period, peaking at 15 to 30 seconds, with magnifications
>from 1.5k to 6k. During a microseism storm, even the LP record could be
>a scribbled mess; usually the storm peak would only last for a several
>hours, so we wouldn't interrupt the recording.
>
>With the advent of wide dynamic range digital recording and VBB response
>instruments, we deal with the microseisms in later digital processing.
>However, for a visible monitor record on a drum recorder, we usually
>use a "twin-T" notch filter to reduce the microseisms by 40db (1/100).
>The twin-T is passive and easy to make with 3 resistors and 4 capacitors.
>Even with the filter, a strong storm can fill the record with noise, which
>is easily seen as 10 waves per minute.
>
>A historical note on tracking hurricanes before the use of
>satellites and aircraft: small seismograph arrays were used.
>At our old station FLO outside St. Louis, two additional small
>vaults were built 1/4 mile west and north of the main vault.
>THen intermediate period (10 second) seismometers were used,
>connected to 6-second galvanometers for photo recording with a
>peak response at 6-seconds.
>THe relative phase of the microseisms crossing the L shaped
>array provided a vector pointing toward the origin if the waves.
>It was much more accurate than 3-component particle motion analysis.
>With several such stations (one was at Spring Hill, AL, another at
>Rochester, NY) providing a pointer, the location of the hurricane
>could be estimated, even when hundreds of km from shore.
>
>There are some examples of the spectral noise from microseisms on
>my web page featuring figures and data; there is even an example of
>a storm peak from a hurricane last year.
>http://www.eas.slu.edu/People/STMorrissey/index.html
>
>Regards,
>Sean-Thomas
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: Automatic E-mailed earthquake files.
From: "Mark & Lori" mlpg@.................
Date: Tue, 31 Aug 1999 10:34:46 -0700
Can you please take me off you address list? Thank you.
----------
>From: Arie Verveer
>To: PSN-L Mailing List
>Subject: Automatic E-mailed earthquake files.
>Date: Mon, Aug 30, 1999, 11:08 PM
>
>Hi
>
>Lately I've been working on a way to send the "SDR" quake files
>automatically via email.
>The reason is, my station is located in a basement some 11 km from home
>and that meant
>a weekend trip to "SDR" to retrieve the data. Anyhow the following
>method has been
>developed to "check and send" any new "SDR" quake files on the hour, to an e-mail
>address.
>
>1)
>You need a "SDR" logging computer networked to a another computer. That computer
>has to be connected to a "ISP" via a modem or some other network connection.
>
>2)
>Set-up "SDR" to save the event files to the networked computer as per "Winquake"
>instructions.
>
>On the network computer I installed some server software for "windows" called
>"Sambar 4.2.9" It runs in the background and is so easy to install. There is a
>charge to get the professional version. (professional - mail, ftp, tenet )
>servers.
>
>The rest is easy; set-up the server scheduler to run a "CGI" on the hour.
>This "CGI"
>is essentially a small program that checks the "SDR" files and looks for a
>new entry.
>If data is found, it's e-mailed via a server program called "mailit.exe".
>
>This a "DOS" program that can send email. This "mailit.exe" program sends
>the e-mail
>to the server mailing program and that in turn sends it to e-mail address.
>It's done this way
>so you could "forward" the mail to other interested people.
>
>I have a permanent "mail" connection to the internet world via the
>networked computer.
>But the server software allows for "Dial-On-Demand".
>
>You must have some familiarity with "TCP/IP" to get things going. If
>anyone's interested then
>I can send you the source "C" code for the "CGI". Its really simple.The
>code is first draft and
>
>can be improved.
>
>It should be remembered that the e-mailed data is "RAW" data and may only
>be a false trigger.
>Also I'm working on a variant of this "CGI" for quick notification. But
>that is very specific
>and
>involves another computer(?).
>
>
>Regards
>
>Arie
>
>ajbv@............
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: USGS open house photos...again...
From: "Mark & Lori" mlpg@.................
Date: Tue, 31 Aug 1999 10:37:23 -0700
Can you please take me off your address list? Thank You
----------
>From: meredith lamb
>To: psn-L mailing list
>Subject: USGS open house photos...again...
>Date: Tue, Aug 31, 1999, 2:08 AM
>
>Hi all,
>
>Trying again..... I put the USGS open house photos on another
>web site. Hopefully it will work somewhat better, and faster.
>The Xoom com site seems to be getting worse with time, and
>patch attempts.
>
>http://www.geocities.com/ResearchTriangle/Facility/1739/page47.html
>
>Yahoo/Geocities has had its long period of troubles also, but seems
>to be somewhat better. You may need to reload sometimes.
>There is a pop up ad, but moving it somewhat out of the way
>initially, will prevent having to delete it with every page you see.
>
>Depending on your computer speed of loading, viewing all could
>consume quite some time.
>
>The site also contains all the rest of my original files:
>
>http://www.geocities.com/ResearchTriangle/Facility/1739/index.html
>
>Thanks,
>
>Meredith Lamb
>
>
>
>
>_____________________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email listserver@.............. with the body of the
>message: leave PSN-L
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: USGS open house photos...again...
From: Greg ghost@.............
Date: Tue, 31 Aug 1999 11:29:00 -0700
meredith lamb wrote:
> Trying again..... I put the USGS open house photos on another
> web site. Hopefully it will work somewhat better, and faster.
> http://www.geocities.com/ResearchTriangle/Facility/1739/page47.html
Thanks Meredith for taking and posting those photos.
,Greg
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: [Fwd: Update?]
From: Edward Cranswick cranswick@........
Date: Sat, 04 Sep 1999 01:32:00 -0600
--
Edward Cranswick US Geological Survey Golden, CO 80401 USA
TEL: 303-273-8609 FAX: 303-273-8600
--------------------------------------------------------------
Kocaeli Earthquake
Kandilli Observatory
Istanbul, Turkey
Tom-
The website has been updated and
provides a summary of our activities in Turkey. Please forward this message
to the appropriate recipients.
We leave for Golden tomorrow. Thank you for coordinating our activities
here in Turkey.
-Edward
Tom Holzer wrote:
> Dave and Ed,
>
> I am curious about how the deployment is going. Did Dave get the
> Toyota-plant K2 on line in time for the M5.2 aftershock? Did all of our
> instruments record it? Did any of you feel it?
>
> What is the present stage of the USGS/Kandilli deployment? Have the
> additional instruments been redeployed and and the origninal deployment
> reconfigured? Has Kandilli been recording on the SSA-2's?
>
> We had an easy, but long trip home. We have been besieged by Bay area
> press, but the earthquake stories are fading from the national press.
>
> I want to say again what a pleasure it was working with you guys. I was
> really impressed by your operation. I think the Survey brass was really
> impressed by the way the whole group performed. I have gotten nothing but
> positive vibes. It made me proud to be part of the effort.
>
> Have a safe trip home in case we do not communicate again.
>
> Tom
>
> -----/\/\/\/\/\/\/\/\/\/\/\/\/\/-----------
>
> Thomas L. Holzer
> U. S. Geological Survey
> 345 Middlefield Road, MS 977
> Menlo Park, CA 94025-3591 USA
> Voice: 650-329-5637 FAX: 650-329-5163
> E-mail: tholzer@........
--
Edward Cranswick US Geological Survey Golden, CO 80401 USA
TEL: 303-273-8609 FAX: 303-273-8600
--------------------------------------------------------------
Kocaeli Earthquake
Kandilli Observatory
Istanbul, Turkey
Subject: A Sense of Disaster - SATURDAY !!
From: Bob Fryer bfryer@............
Date: Fri, 3 Sep 1999 15:46:09 -0700
Hey firefighter friends,
It's on again! Saturday, Discovery Channel, 6:00 p.m. PDT -- according to
my TV scedule.
And -- I have posted this on my webpage. Unfortunately, I will miss Ali's
"Seismic Central" party (1999) to be held on Labor Day week-end. (B{(>
Take care,
Bob Fryer (retired TVFR)
---------------
About "A Sense of Disaster" on The Discovery Channel
"A Sense of Disaster," a documentary about earthquake prediction sciences
outside of the seismological straitjacket, has been rebroadcast on The
Discovery Channel. Taped by Granada TV in 1998, the producers covered a
wide range of events and efforts that could be described as 'hidden
science.'
The program tells the story of "earthquake sensitive" people and animals,
discusses the electromagnetic basis for the phenomenon, and reports on the
successful use of the related sciences to predict earthquakes in China.
Some of the most interesting experiments on the electromagnetics are being
conducted by Prof. Motoji Ikeya, a physicist at Osaka University. Ikeya is
determining whether there is basis-in-fact for many previously unverified
earthquake precursor legends. Professor Ikeya was kind enough to send me a
list of these projects, early last year. Unfortunately for me, most of his
material is published in Japanese.
The archaic "not invented here, so it doesn't exist" bias of the
seismological community was brought into focus by the pathetic obfuscations
of Dr. Robert Geller, at the University of Tokyo, and Dr. Allan Lindh of
the US Geologic Survey, Menlo Park, California.
Five important areas neglected in the program were: Charlotte King's
experience, the basic physics of stressed rocks, the work of the VAN group
in Greece, the hidden military technology, and the successful Landers,
California prediction in June, 1992. Perhaps it should have been a
two-hour program.
The average viewer may express some wonderment at the "earthquake
sensitive" people video-taped at the 'Fourth Annual Seismic Central Party'
(1998) held at Ali Rhoden's home on the San Andreas fault, in the
California desert. I can assure you that these are real people,
experiencing a real phenomenon, while carrying on with their otherwise
ordinary lives. I have enjoyed the generous hospitality of Ali and Steve
Rhoden, and their daughter Ashley, for many weeks over the past four years.
My own investigations into 'paranormal' perception began in 1965, and
focused on earthquake prediction in 1982, after I obtained the full story
of Charlotte King who gave a 12-hour warning for the eruption of Mount
Saint Helens in 1980. These activities were essentially concurrent with my
Fire Department career (1960-1995) in Washington County, Oregon, where I
was a Fire & Rescue dispatcher (1966-1985) before transferring to the Fire
Marshal's Office.
Additional information on "earthquake sensitivity" will be presented on
this webpage.
Thank you,
Bob Fryer
----- earthquake WARNING research -----
--- animals, people, scientific evidence ---
--- http://www.teleport.com/~bfryer ---
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Turkey
From: Larry Cochrane cochrane@..............
Date: Fri, 03 Sep 1999 15:58:35 -0700
From Edward Cranswick...
>Kocaeli Earthquake
>Kandilli Observatory
>Istanbul, Turkey
>Received: from usgs.gov ([193.140.203.93])
>To: Tom Holzer
>CC: carver@......... geo_haz_gld@..................
>Subject: Re: Update?
>
>
>Tom-
> The website has been updated and
>provides a summary of our activities in Turkey. Please forward this message
>to the appropriate recipients.
> We leave for Golden tomorrow. Thank you for coordinating our activities
>here in Turkey.
>-Edward
>
>Tom Holzer wrote:
>
>> Dave and Ed,
>>
>> I am curious about how the deployment is going. Did Dave get the
>> Toyota-plant K2 on line in time for the M5.2 aftershock? Did all of our
>> instruments record it? Did any of you feel it?
>>
>> What is the present stage of the USGS/Kandilli deployment? Have the
>> additional instruments been redeployed and and the origninal deployment
>> reconfigured? Has Kandilli been recording on the SSA-2's?
>>
>> We had an easy, but long trip home. We have been besieged by Bay area
>> press, but the earthquake stories are fading from the national press.
>>
>> I want to say again what a pleasure it was working with you guys. I was
>> really impressed by your operation. I think the Survey brass was really
>> impressed by the way the whole group performed. I have gotten nothing but
>> positive vibes. It made me proud to be part of the effort.
>>
>> Have a safe trip home in case we do not communicate again.
>>
>> Tom
>>
>> -----/\/\/\/\/\/\/\/\/\/\/\/\/\/-----------
>>
>> Thomas L. Holzer
>> U. S. Geological Survey
>> 345 Middlefield Road, MS 977
>> Menlo Park, CA 94025-3591 USA
>> Voice: 650-329-5637 FAX: 650-329-5163
>> E-mail: tholzer@........
>
>--
>Edward Cranswick US Geological Survey Golden, CO 80401 USA
>TEL: 303-273-8609 FAX: 303-273-8600
>--------------------------------------------------------------
>Kocaeli Earthquake
>Kandilli Observatory
>Istanbul, Turkey
>
>
>
>
_____________________________________________________________________
Public Seismic Network Mailing List (PSN-L)
Subject: Re: A Sense of Disaster - SATURDAY !!
From: "BONNIE SCHAFER" bschafer@.........
Date: Fri, 3 Sep 1999 21:31:52 -0700
hi bob,
I AM SO SORRY THAT YOU WON'T BE AT Ali's. you WILL BE MISSED.
hopefully, WHEN i COME TO Oregon, NEXT YEAR, WE CAN GET TOGETHER. believe
ME YOU WOULDN'T HAVE WANTED WHATEVER i HAD WHILE i WAS THERE THE LAST TIME.
i HAVEN'T BEEN THAT SICK IN A LONG TIME.
take CARE AND HAVE A GOOD WEEKEND.
Bonnie the crafty crafter
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Public Seismic Network Mailing List (PSN-L)