Subject: VLF Quakes? From: "David Saum" DSaum@............ Date: Mon, 1 Apr 2002 14:03:00 -0500 From 3/28 Seattle Times: http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html) Thursday, March 28, 2002 - 11:15 a.m. Pacific Feel that? If not, it may be a silent quake By Eric Sorensen Seattle Times science reporter ELLENSBURG - Western Washington is in the midst of an earthquake and a rather sizeable one, but have no fear: it's silent. Researchers at Central Washington University, reporting in tomorrow's issue of the journal Science, say the region has in fact gone through eight "silent earthquakes" since 1992. One in August 1999 released the energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8 Nisqually quake. But because the quakes stretch out over six to eight weeks, their energy is dissipated and barely noticeable. " 'Slow earthquake' is the other term that's been widely used for these," said Meghan Miller, a CWU geologist and lead author of the paper. "The earthquake thing is probably a little bit of a misnomer because there's no real shaking associated with the event. But that's what they're called and I kind of like the 'silent earthquake.' It's poetic." Miller and her colleagues were inspired by work published in Science last year by Herb Dragert, a research scientist with the Geological Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on measurements taken at global-positioning sensors arrayed from Seattle to Neah Bay and on the southern half of Vancouver Island. Ordinarily, the sensors show Western Washington creeping eastward about one-half of an inch a year. This is because the oceanic Juan de Fuca plate is moving east and under the North American Continental plate, forcing the continental plate to compress and move east. But every 14 months or so, the compression in the continental plate eases and rebounds westward. This would be a problem if it rebounded all at once, letting loose a fast, powerful tremor in the upper plate and beneath the major population centers of Vancouver, B.C., Seattle and Portland. But researchers theorize that the movement of silent quakes takes place in a deep, warm and well-lubricated section of the Cascadia fault - where the two plates meet - avoiding the jerky motion that happens when more shallow, cold and stickier portions of the fault give way. The most recent silent quake began on Feb. 7 near Friday Harbor and has been spreading across the region for weeks. The quake is at least magnitude 6, Miller said. Researchers say understanding these quakes gives them a new tool for monitoring the Cascadia fault and how it can cause large earthquakes. While it probably won't help them predict when earthquakes will happen, it should help them prepare for the next large earthquake with better building codes and other safety measures in areas most likely to be affected. Eric Sorensen can be reached at 206-464-8253 or esorensen@................. ------ ....David Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: VLF Quakes? From: "Larry Conklin" lconklin@............ Date: Mon, 1 Apr 2002 14:14:05 -0500 Hi Dave, I found your post particuarly interesting. My sister-in-law lives in Olympia, WA, only a few miles from the Nisqualy quake epicenter. Fortunately, she didn't have any significant damage, despite the fact that her house is on the side of a hill. When the not so silent quake occurred, I was worried the the whole house might have ended up at the bottom of the hill. Larry ----- Original Message ----- From: "David Saum" To: Sent: Monday, April 01, 2002 2:03 PM Subject: VLF Quakes? > From 3/28 Seattle Times: > http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html) > > Thursday, March 28, 2002 - 11:15 a.m. Pacific > > Feel that? If not, it may be a silent quake > > By Eric Sorensen > Seattle Times science reporter > > ELLENSBURG - Western Washington is in the midst of an earthquake and a > rather sizeable one, but have no fear: it's silent. > Researchers at Central Washington University, reporting in tomorrow's > issue of the journal Science, say the region has in fact gone through > eight "silent earthquakes" since 1992. One in August 1999 released the > energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8 > Nisqually quake. But because the quakes stretch out over six to eight > weeks, their energy is dissipated and barely noticeable. > > " 'Slow earthquake' is the other term that's been widely used for > these," said Meghan Miller, a CWU geologist and lead author of the > paper. "The earthquake thing is probably a little bit of a misnomer > because there's no real shaking associated with the event. But that's > what they're called and I kind of like the 'silent earthquake.' It's > poetic." > > Miller and her colleagues were inspired by work published in Science > last year by Herb Dragert, a research scientist with the Geological > Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on > measurements taken at global-positioning sensors arrayed from Seattle to > Neah Bay and on the southern half of Vancouver Island. > > Ordinarily, the sensors show Western Washington creeping eastward about > one-half of an inch a year. This is because the oceanic Juan de Fuca > plate is moving east and under the North American Continental plate, > forcing the continental plate to compress and move east. But every 14 > months or so, the compression in the continental plate eases and > rebounds westward. > > This would be a problem if it rebounded all at once, letting loose a > fast, powerful tremor in the upper plate and beneath the major > population centers of Vancouver, B.C., Seattle and Portland. > > But researchers theorize that the movement of silent quakes takes place > in a deep, warm and well-lubricated section of the Cascadia fault - > where the two plates meet - avoiding the jerky motion that happens when > more shallow, cold and stickier portions of the fault give way. > > The most recent silent quake began on Feb. 7 near Friday Harbor and has > been spreading across the region for weeks. > > The quake is at least magnitude 6, Miller said. > > Researchers say understanding these quakes gives them a new tool for > monitoring the Cascadia fault and how it can cause large earthquakes. > While it probably won't help them predict when earthquakes will happen, > it should help them prepare for the next large earthquake with better > building codes and other safety measures in areas most likely to be > affected. > > Eric Sorensen can be reached at 206-464-8253 or > esorensen@................. > ------ > > ...David Saum > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Silent quakes From: meredithlamb meredithlamb@............. Date: Mon, 01 Apr 2002 13:41:16 -0700 Hi all, Thanks David for the silent quake mention. Checked the web on the "Google" search engine, and come up a number of items on the topic. Some are "PDF" or Adobe form. The SF Gate also has an article: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2002/03/29/MN129869.DTL Meredith Lamb __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: VLF Quakes? From: "Scott Schwartz" schwartz_scott@........... Date: Tue, 02 Apr 2002 00:12:54 -0500

hello David.  i think you have me confused with another Scott Schwartz.  fell free to take me off of this list sin ce i have no clue what any of you are talking about.  and you may want to contact your friend Scott Schwartz and get his c orrect email address.

thanks,

scott schwartz (but you knew that already)

From: "David Saum"
Reply-To: psn-l@..............
To:
Subject: VLF Quakes?
Date: Mon, 1 Apr 2002 14:03:00 -0500
From 3/28 Seattle Times:
http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html)
Thursday, March 28, 2002 - 11:15 a.m. Pacific
Feel that? If not, it may be a silent quake
By Eric Sorensen
Seattle Times science reporter
ELLENSBURG - Western Washington is in the midst of an earthquake and a
rather sizeable one, but have no fear: it's silent.
Researchers at Central Washington University, reporting in tomorrow's
issue of the journal Science, say the region has in fact gone through
eight "silent earthquakes" since 1992. One in August 1999 released the
energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8
Nisqually quake. But because the quakes stretch out over six to eight
weeks, their energy is dissipated and barely noticeable.
" 'Slow earthquake' is the other term that's been widely used for
these," said Meghan Miller, a CWU geologist and lead author of the
paper. "The earthquake thing is probably a little bit of a misnomer
because there's no real shaking associated with the event. But that's
what they're called and I kind of like the 'silent earthquake.' It's
poetic."
Miller and her colleagues were inspired by work published in Science
last year by Herb Dragert, a research scientist with the Geological
Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on
measurements taken at global-positioning sensors arrayed from Seattle to
Neah Bay and on the southern half of Vancouver Island.
Ordinarily, the sensors show Western Washington creeping eastward about
one-half of an inch a year. This is because the oceanic Juan de Fuca
plate is moving east and under the North American Continental plate,
forcing the continental plate to compress and move east. But every 14
months or so, the compression in the continental plate eases and
rebounds westward.
This would be a problem if it rebounded all at once, letting loose a
fast, powerful tremor in the upper plate and beneath the major
population centers of Vancouver, B.C., Seattle and Portland.
But researchers theorize that the movement of silent quakes takes place
in a deep, warm and well-lubricated section of the Cascadia fault -
where the two plates meet - avoiding the jerky motion that happens when
more shallow, cold and stickier portions of the fault give way.
The most recent silent quake began on Feb. 7 near Friday Harbor and has
been spreading across the region for weeks.
The quake is at least magnitude 6, Miller said.
Researchers say understanding these quakes gives them a new tool for
monitoring the Cascadia fault and how it can cause large earthquakes.
While it probably won't help them predict when earthquakes will happen,
it should help them prepare for the next large earthquake with better
building codes and other safety measures in areas most likely to be
affected.
Eric Sorensen can be reached at 206-464-8253 or
esorensen@.................
------
...David Saum
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.

Get your FREE download of MSN Explorer at http://exp lorer.msn.com.
Subject: Fw: Memorial Research Fund for Sean Thomas Morrissey From: "Larry Cochrane" cochrane@.............. Date: Tue, 2 Apr 2002 14:41:46 -0800 All, I received this from Chris who got it from Laurie Hausmann at the University. If you are interested in helping out please send the donation directly to the address below. -Larry Cochrane Redwood City, PSN > Sean's family has arranged for a memorial research fund to be started in > Sean's name at the University. It will be an endowed fund, so it should > be in existence forever, with the purpose of providing research funding > for earth science faculty who are unable to obtain external funding. If > anyone in the PSI group would like to make a donation to this, it would > be very much appreciated by the family. Donations can be sent to the > Saint Louis University Tribute Fund, P.O. Box 8005, St. Louis, MO > 63156-9950. Indicate it is for the Sean-Thomas Morrissey Research Fund > in the Earth Sciences --- or just that it is in memory of Sean. Checks > can be made out to Saint Louis University. > > Knowing how hard Sean had to work to get funding, I know that he would > be very pleased that his family is setting up this fund in his name. > Laurie __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Fw: Memorial Research Fund for Sean Thomas Morrissey From: ian ian@........... Date: Tue, 02 Apr 2002 16:58:15 -1000 http://www.slu.edu/readstory/newslink/982 Larry Cochrane wrote: >All, > >I received this from Chris who got it from Laurie Hausmann at the >University. If you are interested in helping out please send the donation >directly to the address below. > >-Larry Cochrane >Redwood City, PSN > >>Sean's family has arranged for a memorial research fund to be started in >>Sean's name at the University. It will be an endowed fund, so it should >>be in existence forever, with the purpose of providing research funding >>for earth science faculty who are unable to obtain external funding. If >>anyone in the PSI group would like to make a donation to this, it would >>be very much appreciated by the family. Donations can be sent to the >>Saint Louis University Tribute Fund, P.O. Box 8005, St. Louis, MO >>63156-9950. Indicate it is for the Sean-Thomas Morrissey Research Fund >>in the Earth Sciences --- or just that it is in memory of Sean. Checks >>can be made out to Saint Louis University. >> >>Knowing how hard Sean had to work to get funding, I know that he would >>be very pleased that his family is setting up this fund in his name. >>Laurie >> > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > 
http://www.slu.edu/readstory/new
slink/982
Larry Cochrane wrote:
All,

I received this from Chris who got it from Laurie Hausmann at the
University. If you are interest
ed in helping out please send the donation
directly to the address below.

-Larry Cochrane
Redwood City, PSN

Sean's family has arranged for a memorial research fund to be started in
Sean's name at the University.  It
 will be an endowed fund, so it should
be in existence forever, with the purpose of providing research funding
for earth 
science faculty who are unable to obtain external funding.  If
anyone in the PSI group would like to make a donation to this
, it would
be very much appreciated by the family.  Donations can be sent to the
Saint Louis University Tribute Fund, P.O
. Box 8005, St. Louis, MO
63156-9950.  Indicate it is for the Sean-Thomas Morrissey Research Fund
in the Earth Sciences -
-- or just that it is in memory of Sean.  Checks
can be made out to Saint Louis University.

Knowing how hard Sean had
 to work to get funding, I know that he would
be very pleased that his family is setting up this fund in his name.
Laurie



__________________________________________________________

Public Seismic Network Mailin
g List (PSN-L)

To leave this list email P
SN-L-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.


Subject: Fw: Photo enquiry From: "Larry Cochrane" cochrane@.............. Date: Tue, 2 Apr 2002 21:55:44 -0800 Greeting, Can someone help out Maryann? She needs a photo of someone looking at a seismogram. I already told her about the GIF images she can create on my web site. Please send any information to her directly since she is not on the list. Thanks. -Larry Cochrane Redwood City, PSN ----- Original Message ----- From: "Maryann Ballantyne" To: Sent: Monday, April 01, 2002 8:51 PM Subject: Photo enquiry > hello > I have looked at you terrific web page and I am hoping that you can help > me. I work for an independent Australian publishing company called Black > Dog Books and at the moment we are preparing a book for 7 to 9 year olds > about earthquakes. The book is a part of a series of 40 non-fiction > titles called Zebras and will be published in Australia and > internationally late this year. > I was hoping that you may be able to help me with a photograph of a > seismograph/ people looking at a seismograph readout/ an actual > seismograph readout or whatever you think may be useful to illustrate > how a seismograph works. > > We need these pics at 300 DPI. > Thank you in anticipation > Maryann Ballantyner > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Sprengnether digital recorder on ebay From: BOB BARNS royb1@........... Date: Wed, 03 Apr 2002 09:53:34 -0500 Hi, Ebay has a Sprengnether DR-100 digital recorder for sale. http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1089855149 The auction ends 4/9 Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Finding your station coordinates From: John & Jan johnjan@........ Date: Thu, 04 Apr 2002 22:17:33 -0700 This page may be helpful in finding the coordinates of you seismograph station. An even better site is http://terraserver.com/ Cheers, John From Earth Science Site of Week sent Apr. 2: Here's missing URL for LATITUDE/LONGITUDE POSITION FINDER: "Use this resource to identify the latitude and longitude position of any point within the [coterminous] United States. Simply touch the map below to zoom in on the area you select, until you find the precise location. There are 9 zoom levels in all." Audience: All. http://www.juggling.org/bin/un.cgi/map-find I've also included some other useful mapping resources. Mark Francek Professor of Geography and Earth Science Mt. Pleasant, MI 48859 E-Mail: Mark.Francek@......... Phone: (989) 774 7617 Fax: (989) 774-290 Resource Page: http://personal.cmich.edu/~franc1m/homepage.htm John C. Lahr 1925 Foothills Road Golden, CO 80402 Phone: (303) 215-9913 john@........ http://lahr.org/john-jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Finding your station coordinates From: meredithlamb meredithlamb@............. Date: Fri, 05 Apr 2002 01:07:16 -0700 Hi John, Another excellent web site (if you live in certain U.S. states) is at: http//www.epa.gov/enviro/wme/ One can move the map directional, and the cursor movement reveals the longitude and latitude to help pinpoint along streets roads, highways etc. Meredith Lamb John & Jan wrote: > This page may be helpful in finding the coordinates of you seismograph > station. An even better site is http://terraserver.com/ > > Cheers, > John > > From Earth Science Site of Week sent Apr. 2: > Here's missing URL for > LATITUDE/LONGITUDE POSITION FINDER: "Use this resource to identify the > latitude and longitude position of any point within the [coterminous] > United States. Simply touch the map below to zoom in on the area you > select, until you find the precise location. There are 9 zoom levels in > all." Audience: All. > > http://www.juggling.org/bin/un.cgi/map-find > I've also included some other useful mapping resources. > > Mark Francek > Professor of Geography > and Earth Science > Mt. Pleasant, MI 48859 > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Finding your station coordinates From: Hammonds hammond@........... Date: Fri, 05 Apr 2002 05:10:04 -0900 My favorite is http://www.topozone.com which displays topographic maps in various scales as well as cursor readout of lat/long in UTM ,decimal and degree formats. Topo maps are available for all 50 states. Bob Hammond APSN, Fairbanks http://apsn.awcable.com At 11:07 PM 4/4/02, you wrote: >Hi John, > >Another excellent web site (if you live in certain U.S. states) >is at: >http//www.epa.gov/enviro/wme/ >One can move the map directional, and the cursor movement >reveals the longitude and latitude to help pinpoint along streets >roads, highways etc. > >Meredith Lamb > > >John & Jan wrote: > > > This page may be helpful in finding the coordinates of you seismograph > > station. An even better site is http://terraserver.com/ > > > > Cheers, > > John > > > > From Earth Science Site of Week sent Apr. 2: > > Here's missing URL for > > LATITUDE/LONGITUDE POSITION FINDER: "Use this resource to identify the > > latitude and longitude position of any point within the [coterminous] > > United States. Simply touch the map below to zoom in on the area you > > select, until you find the precise location. There are 9 zoom levels in > > all." Audience: All. > > > > http://www.juggling.org/bin/un.cgi/map-find > > I've also included some other useful mapping resources. > > > > Mark Francek > > Professor of Geography > > and Earth Science > > Mt. Pleasant, MI 48859 > > > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: LIVE ATV COMPARISONS OF INCOMING QUAKES From: "Frank Cooper" fxc@....... Date: Sun, 7 Apr 2002 19:06:38 -0500 Hello all, John Cole and I (Frank Cooper) have for several years been making live television (amateur fast scan television --- ATV) comparisions of the incoming seismic waves of earthquakes in progress. John lives in Pearland, Texas, USA and I live in Friendswood, Texas, USA. --- 11 miles distant from each other. We use fast scan TV (amateur television) to make comparisons of the seismic waves as they are shown on our chart recorders or computer monitors. We keep a running commentary about the possible epicenter, comments about the wave forms, etc. That makes amateur seismology and amateur television a lot more interesting. For the first time we have pictures on our respective web sites related to this activity and I thought perhaps the group might be interested. The pictures on the web sites of the TV monitors show the incoming seismic waves from this afternoon's 4.6M REVILLA GIGEDO ISLANDS REGION quake. My amateur radio web radio W5VID site (where pictures are posted) is at: http://pages.prodigy.net/fxc/W5VID.html My amateur seismology web site (the ATV pictures are not posted on this site) is at: http://pages.prodigy.net/fxc/ John's amateur seismology web page (where pictures are posted) is at: http://pages.prodigy.net/fxc/JC.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Filter/Amplifier From: "Randall Pratt" randallpratts@.......... Date: Sat, 13 Apr 2002 22:10:00 -0500 Hi, Does anyone have troubleshooting experience with the filter final amp = section of the PSN circuit? After 2 1/2 years of operation I began to = notice strange signals in my records. Now I can only get a full scale = reading either + or - with a very small change of the centering 50K pot. = I removed the pot thinking it was bad but I can't detect any shorts or = bad spots over the range of adjustment. If I remove the OP27 from its = socket the AD reads a steady 2 and responds properly to various voltages = applied directly to the output pin of the OP27 socket. I have the input = shorted to ground and I have tried removeing the LF 353 with no change. = I have also swapped the OP27 with another with the same result.=20 Randy
Hi,
 
Does anyone have troubleshooting = experience with=20 the filter final amp section of the PSN circuit?  After 2 1/2 years = of=20 operation I began to notice strange signals in my records.  Now I = can only=20 get a full scale reading either + or - with a very small change of the = centering=20 50K pot.  I removed the pot thinking it was bad but I can't detect = any=20 shorts or bad spots over the range of adjustment.  If I remove the = OP27=20 from its socket the AD reads a steady 2 and responds properly to=20 various voltages applied directly to the output pin of the OP27=20 socket.  I have the input shorted to ground and I have tried = removeing the=20 LF 353 with no change.  I have also swapped the OP27 with another = with the=20 same result. 
 
Randy  
Subject: RE: Filter/Amplifier From: steve hammond shammon1@............. Date: Sun, 14 Apr 2002 10:31:33 -0700 http://pw2.netcom.com/~shammon1/equip.htm are you talking about the amp at the bottom of this page or like this one this is the steps I follow? Check the seismograph for spider webs. Check the connections for dampness and water damage. If you can, try to split amp into stages without disconnecting the system. Pre amps , filter and leveling. I use jumper wires and connect the stages into the A/D. These are the steps I follow trying to get an amp back to life. (1) Check the power supply by running the amps on battery for awhile. Check all the resisters with a meter looking for damage. The 100 ohm power resisters feeding the +/- 12V to the op amps will crack once in a blue moon. Look and probe for loss or bad solder connections on the board. Time and moisture damage will cause all sorts of errors. Did the error go away? NO-- (2) Op 27 have a tendency to respond as you described below when they are going out. Use a jumper wire to skip around each op amp stage and see if the error goes away. See if you can isolate the error by splitting the pre amps from the filter/AC/level gain stage. Did you get it down to one of two stages? Replace the OP amps in that stage. Did the error go away? replace op amps/ repare {} NO-- (3) Replace the two op27's in the pre amp section. If there is any question, replace them a second time. This is the most common source of noise. Try using a different pair of op-amps. Make certain this is not the source of your error. Did the error go away? replace op amps/ repare {} NO-- (4) Jumper around the 3-poll filter and the AC coupling cap op amp(s) connecting the input wire of the 3-poll filter to the input of the leveling and gain section. Did the error go away? replace op amps/ repare {} NO-- (5) Replace the op-amp for the level/gain. Did the error go away? replace op amps/ repare {} NO-- In the next step you will use fixed value resisters to parallel (or jumper around) the two pots. Don't just use a jumper wire. (6) spot solder the 50K pot with two 25K resister across the wipers of pot. (Common in most pots is the center connection) You won't be able to level the output but if the error goes away the pot is bad. (7) In the gain stage I use a 100k pot. Spot solder a 100k resister across the wiper to common of the pot setting the pot to max gain. If the error goes way the pot is bad. (8) Replace the AC coupling cap. (9) Go back to the pre-amp and start replacing the caps. Steve Hammond PSN Aptos, CA -----Original Message----- From: Randall Pratt [SMTP:randallpratts@........... Sent: Saturday, April 13, 2002 8:10 PM To: psn-l@.............. Subject: Filter/Amplifier Hi, Does anyone have troubleshooting experience with the filter final amp section of the PSN circuit? After 2 1/2 years of operation I began to notice strange signals in my records. Now I can only get a full scale reading either + or - with a very small change of the centering 50K pot. I removed the pot thinking it was bad but I can't detect any shorts or bad spots over the range of adjustment. If I remove the OP27 from its socket the AD reads a steady 2 and responds properly to various voltages applied directly to the output pin of the OP27 socket. I have the input shorted to ground and I have tried removeing the LF 353 with no change. I have also swapped the OP27 with another with the same result. Randy << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: New release of WinQuake From: "Larry Cochrane" cochrane@.............. Date: Sun, 14 Apr 2002 16:04:04 -0700 Hi All, I have a new release of WinQuake available on my web site. You can download it from here http://www.seismicnet.com/software.html. The version number is 2.8.8. The main reason for this release is to sync up the documentation with the program. Over the last year I have made several changes to the software without updating the documentation. I now have the documentation up to date. You can view it online here http://www.seismicnet.com/wqdocs/winquake.html or on your computer after installing the new release. Besides updating the documentation I fixed a few bugs and made a few improvements. You can now have the program associate the file type of .psn to WinQuake. By associating the file extension of .psn to WinQuake, whenever you click on a file or web link ending in .psn, WinQuake will be opened and the event file displayed in the event window. The first time you start this version you will be asked if you want to associate the .psn file type. If you answer no you can do it at a later time by using the File / Associate PSN File menu items. This menu item will be disable if the association information in the system registry is up to date. One other change I made is in the Time Domain filtering dialog box. You can now select both the highpass and lowpass filter check boxes. By checking both you will essentially be doing a bandpass filter. The one bug I remember fixing is in the event window code. The program would hang if this window was made very small. Thanks it... -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Filter/Amplifier From: "Randall Pratt" randallpratts@.......... Date: Sun, 14 Apr 2002 16:45:22 -0500 Steve, Thanks for help. I was quite certain it was in the final OP27 stage of the circuit you referenced. I started resoldering and found the connection to pin 6 to be the culprit. I don't have all back together but the last 2 stages and the AD are running fairly quietly now for a couple of hours. While on the noise subject, I have readings up to about 15 counts from just the LF353 and the last OP27 with a jumper across the input in front of the 3 pole filter. With the OP27 removed the AD sits at a steady 2. Is this about what I should experience? I have a 5K pot for gain set about half or a little more. The noise doesn't seem to have a particular frequency on the fft. Randy ----- Original Message ----- From: "steve hammond" To: Sent: Sunday, April 14, 2002 12:31 PM Subject: RE: Filter/Amplifier > http://pw2.netcom.com/~shammon1/equip.htm are you talking about the amp at > the bottom of this page or like this one this is the steps I follow? Check > the seismograph for spider webs. Check the connections for dampness and > clip __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Questions on VAN From: SW6079@....... Date: Mon, 15 Apr 2002 22:07:46 EDT I've been reading a very interesting book on e-quake prediction based on the VAN method of detecting precursor signals, they apparently use a fairly simple system connected to voltage amplifiers much like the type we employ for lehman's etc. Does anyone know of success in the states w/ this? Tnx, Mike. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN From: Bob Fryer bfryer@............ Date: Tue, 16 Apr 2002 10:10:07 -0700 Hello Mike, What book is that? I'm not aware of anyone using the VAN method in the USA, however they are working with it in Japan and China. The ELFrad Group here is getting some interesting signals. www.elfrad.com Some private researchers here are using a simple volttage tester hooked to two electrodes buried in the ground to measure earth currents. One, in the San Andreas Rift Zone of NE L.A. county is getting some interesting readings that appear to be precursors. The voltage drops to zero briefly, several times over a period of five or so minutes. I can send you a description of at least one such incident. Also, I was there and witnessed it once myself, about two years ago. [Note: Since there is no recording system, it is out in the yard in a weatherproof box, and it has been witnessed perhaps half a dozen or more times over about six years, it must happen fairly frequently.] The set-up is described on page 125 of "When The Snakes Awake" by Prof Helmut Tributsch, MIT Press, 1982. If you don't have the book, I can send you the relevent text by private E-mail. There may still be a website available showing materials used, etc. Somewhere I have a reference to a similar voltage drop recorded by scientists in Southern Calif. Bob Fryer, Beaverton, Oregon >I've been reading a very interesting book on e-quake prediction based on the >VAN method of detecting precursor signals, they apparently use a fairly >simple system connected to voltage amplifiers much like the type we employ >for lehman's etc. Does anyone know of success in the states w/ this? Tnx, >Mike. >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > -- earthquake WARNING research Animals, People, Scientific Evidence www.earthquakewarning.org __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN (reply to Bob ) From: SW6079@....... Date: Tue, 16 Apr 2002 21:05:55 EDT Hi Bob, The book is "Earthquake Prediction" by Haroun Tazieff. Very well written. However it is sparse on the actual layout of sensors and amplification required. It contains a fascinating theory of why it works so well also. They claim 90% success for regions that have been "calibrated", that is, one or more seismic signals have been received that indicate how a region "responds" These fellows have been around and have been having success in several European countries since about the mid '80s. Sure would like to give it a try. In WA there are several regions that are regularly active. Mike. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN From: "Erich Kern" efkern@............. Date: Tue, 16 Apr 2002 19:27:08 -0700 Hi All, For a long list of VAN references, links and books, I just went to www.google.com In the advanced search box type in van+earthquake no spaces, and use the + sign as shown, select the box "30 results". In the box below, select English, otherwise you'll get references in Greek (the VAN guys were Greek scientists) hit Google Search, and you'll have more references to VAN than you can use. Regards, Erich Kern ----- Original Message ----- From: "Bob Fryer" To: Sent: Tuesday, April 16, 2002 10:10 AM Subject: Re: Questions on VAN Hello Mike, What book is that? __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Questions on VAN (reply to Bob ) From: Bob Fryer bfryer@............ Date: Wed, 17 Apr 2002 00:46:47 -0700 Hello Mike, Erich, Yes, that is a good book for what it covers. That and many more are covered in the various "Resources" on my website (see below). Erich, I have many of the items -- except the most recent ones. Lots of time copying articles at university libraries. If we want to continue this, it should probably be by private E-mail. Take care, Bob Fryer >Hi Bob, The book is "Earthquake Prediction" by Haroun Tazieff. Very well >written. However it is sparse on the actual layout of sensors and >amplification required. It contains a fascinating theory of why it works so >well also. They claim 90% success for regions that have been "calibrated", >that is, one or more seismic signals have been received that indicate how a >region "responds" These fellows have been around and have been having >success in several European countries since about the mid '80s. Sure would >like to give it a try. In WA there are several regions that are regularly >active. Mike. -- earthquake WARNING research Animals, People, Scientific Evidence www.earthquakewarning.org __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: accelerometer on ebay From: BOB BARNS royb1@........... Date: Wed, 17 Apr 2002 11:52:37 -0400 Hi gang, Ebay is showing a Kinemetrics Force Balance Accelerometer #FBA3 Item # 1721771709 First bid US $110.00 Ends Apr-18-02 13:10:20 PDT I have no idea what this might be good for. Bob __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: accelerometer on ebay From: Doug Crice dcrice@............ Date: Wed, 17 Apr 2002 07:38:43 -0700 The FBA-3 is a 3-component accelerometer with a range of perhaps 1/2 to 1 g acceleration. It was used in combination with a digital data acquisition system to record vibrations from strong earthquakes. Typcially, systems would be installed in the basement, roof, and middle of a building to record the structural response to earthquakes. Variations were used in boreholes to study ground spectral amplification ratios and as parts of systems in other sturctures. The FBA-3 has no practical purpose in recording small or distant earthquake. BOB BARNS wrote: > > Hi gang, > Ebay is showing a Kinemetrics Force Balance Accelerometer #FBA3 > Item # 1721771709 > First bid US $110.00 > Ends Apr-18-02 13:10:20 PDT > I have no idea what this might be good for. > Bob > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Drum plotter for Dataq users From: Bobhelenmcclure@....... Date: Fri, 19 Apr 2002 23:15:31 EDT Hi everyone, Since I would enjoy having others appreciate and enjoy the fruits of my recent hard labor, I am offering to share free my drum plot program with others having the same hobby. I warrant that the program is not malicious, but will take no responsibility if fails to live up to your expectations. It does fully live up to mine, and has proved to be very useful. With its built-in filters, I can record teleseisms of magnitude 6.5 or more, and accurately reproduce L waves of 24 seconds period, even though my antique Strengnether seismometer has a natural period of only 3.5 seconds. This VisualBasic6.0 program presents seismic data in a 24hr format, starting at the first hour recorded, using WDQ files recorded by Dataq hardware and software (DI-194 Acquisition). The format is very similar to that seen on the LDEO-LDSN Data Repository website: http://www.ldeo.columbia.edu/~wykim/LCSN/lcsn.html An expanded plot capaibility is provided, the starting time determined by a mouse click on the desired time on the drum plot. Filtered copies of the original file can be saved by a mouse click. Filter options include high pass, smooth, long period, and broadband, with user controlled filter parameters. For most accurate long period and broadband response, the user must input the period and damping of the sensor. A most useful feature of this program is its ability to display filtered seismic data as the raw data is being recorded. When a file currently open for recording is selected, the drum plot is updated as often as new data is recorded to the file (every 256 data samples). The user has almost instant knowledge of a seismic event when it occurs. The ability to examine the detailed waveform plot is retained as well. This program is not available in installable form. Simply run the file as is. It usually will run without requiring more system files on Windows98 or later. Using my sample files, you won't even need the Dataq hardware and software to try it out. You can order the A/D board and WindaQ Lite software from DataQ.com for about $15. You will need a very stable low-pass DC amplifier delivering at least +-4.5v to drive the DataQ board. Matching this program up to the characteristics of your particular sensor and sampling rate may require some program changes, which I am willing to do for you. I could also adapt this program to read any other data file format. If you have an interest, please e-mail me for a more detailed description of the program. Also, describe what equipment you are using. If you have any experience in VisualBasic programming, say so. I might want to give you the source code, so I won't have to help you every time you need it. Bob McClure bobhelenmcclure@....... Hi everyone,

  Since I would enjoy having others appreciate and enjoy the fruits of my recent hard labor, I am offering to sh are free my drum plot program with others having the same hobby.  I warrant that the program is not malicious, but will ta ke no responsibility if fails to live up to your expectations.  It does fully live up to mine, and has proved to be very u seful. With its built-in filters, I can record teleseisms of magnitude 6.5 or more, and accurately reproduce L waves of 24 seco nds period, even though my antique Strengnether seismometer has a natural period of only 3.5 seconds.

 This VisualBasic6.0 program presents seismic data in a 24hr format, starting at the first hour recorded, using WDQ f iles recorded by Dataq hardware and software (DI-194 Acquisition).  The format is very similar to that seen on the LDEO-LD SN Data Repository website:

     http://www.ldeo.columbia.edu/~wykim/LCSN/lcsn.html

 An expanded plot capaibility is provided, the starting time determined by a mouse click on the desired time on the d rum plot.  Filtered copies of the original file can be saved by a mouse click.  Filter options include high pass, smo oth, long period, and broadband, with user controlled filter parameters.  For most accurate long period and broadband resp onse, the user must input the period and damping of the sensor.

 A most useful feature of this program is its ability to display filtered seismic data as the raw data is being recor ded.  When a file currently open for recording is selected,  the drum plot is updated as often as new data is recorde d to the file (every 256 data samples).  The user has almost instant knowledge of a seismic event when it occurs.  Th e ability to examine the detailed waveform plot is retained as well.

 This program is not available in installable form.  Simply run the file as is.  It usually will run withou t requiring more system files on Windows98 or later.  Using my sample files, you won't even need the Dataq hardware and so ftware to try it out.  You can order the A/D board and WindaQ Lite software from DataQ.com for about $15.  You will n eed a very stable low-pass DC amplifier delivering at least +-4.5v to drive the DataQ board.

 Matching this program up to the characteristics of your particular sensor and sampling rate may require some program changes, which I am willing to do for you.  I could also adapt this program to read any other data file format.

 If you have an interest, please e-mail me for a more detailed description of the program.  Also, describe what equipment you are using.  If you have any experience in VisualBasic programming, say so.  I might want to give you th e source code, so I won't have to help you every time you need it.

Bob McClure
bobhelenmcclure@....... Subject: Re: Drum plotter for Dataq users From: John Lahr johnjan@........ Date: Fri, 19 Apr 2002 22:37:02 -0600 Hi Bob,

This sounds like a great program.  I would like to try it out with your test data.

I don't have a DI-194, but do have the DI-154 unit.  Do you think it will work with this
format as well?  I think the 12 bit AD will be helpful, although the price is $150
(100 with an educational discount).

Cheers,
John

At 11:15 PM 4/19/2002 -0400, you wrote:
Hi everyone,

  Since I would enjoy having others appreciate and enjoy the fruits of my recent hard labor, I am offering to share free my drum plot program with others having the same hobby.  I warrant that the program is not malicious, but will take no responsibility if fails to live up to your expectations.  It does fully live up to mine, and has proved to be very useful. With its built-in filters, I can record teleseisms of magnitude 6.5 or more, and accurately reproduce L waves of 24 seconds period, even though my antique Strengnether seismometer has a natural period of only 3.5 seconds.

 This VisualBasic6.0 program presents seismic data in a 24hr format, starting at the first hour recorded, using WDQ files recorded by Dataq hardware and software (DI-194 Acquisition).  The format is very similar to that seen on the LDEO-LDSN Data Repository website:

     http://www.ldeo.columbia.edu/~wykim/LCSN/lcsn.htm l

 An expanded plot capaibility is provided, the starting time determined by a mouse click on the desired time on the drum p lot.  Filtered copies of the original file can be saved by a mouse click.  Filter options include high pass, smooth, long period, and broadband, with user controlled filter parameters.  For most accurate long period and broadband response, the user must input the period and damping of the sensor.

 A most useful feature of this program is its ability to display filtered seismic data as the raw data is being recorded.& nbsp; When a file currently open for recording is selected,  the drum plot is updated as often as new data is recorded to the file (every 256 data samples).  The user has almost instant knowledge of a seismic event when it occurs.  The abi lity to examine the detailed waveform plot is retained as well.

 This program is not available in installable form.  Simply run the file as is.  It usually will run without req uiring more system files on Windows98 or later.  Using my sample files, you won't even need the Dataq hardware and softwar e to try it out.  You can order the A/D board and WindaQ Lite software from DataQ.com for about $15.  You will need a very stable low-pass DC amplifier delivering at least +-4.5v to drive the DataQ board.

 Matching this program up to the characteristics of your particular sensor and sampling rate may require some program chan ges, which I am willing to do for you.  I could also adapt this program to read any other data file format.

 If you have an interest, please e-mail me for a more detailed description of the program.  Also, describe what equip ment you are using.  If you have any experience in VisualBasic programming, say so.  I might want to give you the sou rce code, so I won't have to help you every time you need it.

Bob McClure
bobhelenmcclure@.......

John C. Lahr
1925 Foothills Road
Golden, CO 80402
Phone: (303) 215-9913 
john@........
http://lahr.org/john-jan/science.html Subject: Morning Shake? From: Stephanie Gilgut steph@................. Date: Sat, 20 Apr 2002 06:29:53 -0400 (EDT) Hi all, I was wondering if anyone picked up a short n/s shake somewhere this AM (Saturday) near 7 AM EST. I'm located near Albany, NY. The bed, and things in the room were doing a short back and forth 2 step. Not enough to topple things but definitely quite noticeable. Duration was about 30 secs. Thanks, Steph -- Ms. Stephanie Gilgut - President SGE, inc. 225 River St. Troy, NY. 12180 voice: (518) 271-8079 fax: (518) 271-6289 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: Morning Shake? From: "Marchal van Lare" vanlare@............. Date: Sat, 20 Apr 2002 13:45:50 +0200 According to Redpuma : 20Apr2002 10:50:42.0 43.0N 75.0W 10 mb=5.5 A*LED NEW YORK 1107 20Apr2002 10:51:50.2 50.7N 64.7W 10 mb=5.5 A*SED EASTERN QUEBEC, CANADA 1107 Marchal -----Oorspronkelijk bericht----- Van: psn-l-request@.............. [mailto:psn-l-request@..................... Stephanie Gilgut Verzonden: zaterdag 20 april 2002 12:30 Aan: psn-l@.............. Onderwerp: Morning Shake? Hi all, I was wondering if anyone picked up a short n/s shake somewhere this AM (Saturday) near 7 AM EST. I'm located near Albany, NY. The bed, and things in the room were doing a short back and forth 2 step. Not enough to topple things but definitely quite noticeable. Duration was about 30 secs. Thanks, Steph -- Ms. Stephanie Gilgut - President SGE, inc. 225 River St. Troy, NY. 12180 voice: (518) 271-8079 fax: (518) 271-6289 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Fwd: M 5.1 EQ in NEW YORK Z= 5km Sat Apr 20 10:50:44 2002 UTC From: John Lahr johnjan@........ Date: Sat, 20 Apr 2002 05:53:09 -0600 Here's the USGS location, in case you are not subscribed to the Bigquake list. For more details see: http://neic.usgs.gov/neis/bulletin/neic_deam.html and if you felt it, use the link on that page to provide some information that will be automatically posted. Cheers, John >Mailing-List: contact bigquake-help@.................. run by ezmlm >X-No-Archive: yes >List-Help: >List-Unsubscribe: >List-Subscribe: >Delivered-To: mailing list bigquake@................. >Date: Sat, 20 Apr 2002 05:35:39 -0600 (MDT) >Subject: M 5.1 EQ in NEW YORK Z= 5km Sat Apr 20 10:50:44 2002 UTC >44.51N 73.66W >From: Do_Not_Reply@................... > > This information is provided by the USGS > National Earthquake Information Center. > (Address problems to: sedas@.................... > >These parameters are preliminary and subject to revision. > >A magnitude 5.1 earthquake in NEW YORK has occurred at: >44.51N 73.66W Depth 5km Sat Apr 20 10:50:44 2002 UTC > >Time: Universal Time (UTC) Sat Apr 20 10:50:44 2002 > Eastern Daylight Time (EDT) Sat Apr 20 06:50:44 2002 > Central Daylight Time (CDT) Sat Apr 20 05:50:44 2002 > Mountain Daylight Time (MDT) Sat Apr 20 04:50:44 2002 > Pacific Daylight Time (PDT) Sat Apr 20 03:50:44 2002 > Alaska Daylight Time (ADT) Sat Apr 20 02:50:44 2002 > Hawaii Standard Time (HST) Sat Apr 20 00:50:44 2002 > >Location with respect to nearby cities: > 15 miles (25 km) SW of Plattsburgh, New York (pop 21,000) > 20 miles (35 km) W of Burlington, Vermont (pop 39,000) > 55 miles (90 km) WNW of MONTPELIER, Vermont (pop 8,000) > 130 miles (205 km) N of ALBANY, New York > >For additional information and subsequent updates, including >associated information and maps please consult the following >web page, which will be available shortly: >http://neic.usgs.gov/neis/bulletin/neic_deam.html . > >For the most significant earthquakes, information may also be >available from the USGS Earthquake Hazards Program home page at >http://earthquake.usgs.gov/ and the USGS home page at >http://www.usgs.gov/ . > >You will continue to receive messages like this when >earthquakes occur that have magnitude 5.5 or greater >anywhere in the world OR 4.5 or greater in the contiguous >US, Hawaii, and Alaska (excluding the Aleutian Islands). > >The subscription form for this service is located at: >http://neic.usgs.gov/neis/data_services/data_services.html >If you do not wish to receive these messages, please visit >that site, select "bigquake," enter your Email address, and select, >"unsubscribe." >-- >U.S. Geological Survey -- Science for a Changing World * John C. and Jan H. Lahr * JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * Phone: (303) 215-9913 * http://lahr.org/john--jan/science.html __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Plattsburgh Earthquake From: John Lahr johnjan@........ Date: Sat, 20 Apr 2002 06:13:31 -0600 This map shows the distribution of historic northeastern seismicity: http://greenwood.cr.usgs.gov/pub/i-maps/i-2737/ The intensity map is has 1,077 responses so far: http://pasadena.wr.usgs.gov/shake/ne/STORE/Xdeam/ciim_display.html John John C. Lahr lahr@........ (work) john@........ (home) Central Region Geologic Hazards Team U.S. Geological Survey PO Box 25046 Denver, CO 80225 Work: Phone (303) 273-8596 FAX (303) 273-8600 Home: Phone (303) 215-9913 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Plattsburgh Earthquake From: Stephanie Gilgut steph@................. Date: Sat, 20 Apr 2002 07:36:00 -0400 (EDT) Thanks, folks. There have been some "was that a shake?" events in my past years, but nothing I was positive about. This one I was 90% sure. Thanks for the pointers and info. Steph -- Ms. Stephanie Gilgut - President SGE, inc. 225 River St. Troy, NY. 12180 voice: (518) 271-8079 fax: (518) 271-6289 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re; Plattsburgh Earthquake From: "Larry Conklin" lconklin@............ Date: Sat, 20 Apr 2002 09:24:51 -0400 This morning's quake woke my wife and me out of a sound sleep. A very definite gentle shaking of the bed. I am running a Shackleford-Gunderson sensor, based on Larry Cochrane's board. The sensor is oriented east-west. The high frequency channel saturated for a good part of the record, and the L channel went sort of crazy during the same interval. Too much of a good thing, I guess. Larry Conklin lconklin@............ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Drum plotter for Dataq users From: Bobhelenmcclure@....... Date: Sat, 20 Apr 2002 19:35:09 EDT To those inquiring about my program: DrumPlot is not a data acquisition program. It can only read, filter, and display data files that are acquired using Dataq hardware and software. I use the DI-194 starter kit and the software supplied with the board. The files generated have the extension WDQ. The DI-194 samples data at at a fixed rate of 240 s/s with 8-bit conversion. It appears to have more precision at slower sampling rates because the Dataq acquisition program averages all the data points sampled at the 240/s rate that fall within the slower recorded sampling interval. This works pretty well for me, since I sample at 5 s/s, get the benefit of the average of 48 actual samples per recorded sample, which, if the signal is dynamic enough, washes out the quantitization error. For sensors with very short natural periods, such as geophones, you must sample at higher rates than 5 s/s, and will end up closer to the basic 8-bit resolution than the DI-194 will provide. For more resolution, you need the DI-154 with 12-bit resolution at 240 s/s, so you still have at least 12 bits at any rate, and an effective maximum of 14 bits at lower recorded rates. This is still less than one might wish for. You also get a little less for your money now. Dataq raised the price of the DI-194 from less than $15 to $24. The DI-154 went from about $100 to $150 (+$8.55 shipping). The filters in my program can still be used at high sampling rates on a short period instrument, but the default time constants I use will have to be reduced. If you can get the program to work in the way you desire with user input time constants, I can furnish a revised program with different defaults, or change the program to remember your defaults in a setup operation. Also note that the inverse filter used to extend the effective period is based on the passive type of sensor, whose output voltage is proportional to the velocity of a damped pendulum. Bob McClure bobhelenmcclure@....... To those inquiring about my program:

DrumPlot is not a data acquisition program.  It can only read, filter, and display data files that are acquired using Dataq hardware and software.  I use the DI-194 starter kit and the software supplied with the board.  The files gener ated have the extension WDQ.

 The DI-194 samples data at at a fixed rate of 240 s/s with 8-bit conversion.  It appears to have more precision at slower sampling rates because the Dataq acquisition program averages all the data points sampled at the 240/s rate that fal l within the slower recorded sampling interval.  This works pretty well for me, since I sample at 5 s/s, get the benefit o f the average of 48 actual samples per recorded sample, which, if the signal is dynamic enough, washes out the quantitization e rror.  For sensors with very short natural periods, such as geophones, you must sample at higher rates than 5 s/s, and wil l end up closer to the basic  8-bit resolution than the DI-194 will provide.  For more resolution, you need the DI-15 4 with 12-bit resolution at 240 s/s, so you still have at least 12 bits at any rate, and an effective maximum of  14 bits at lower recorded rates.  This is still less than one might wish for.  You also get a little less for your money now.  Dataq raised the price of the DI-194 from less than $15 to $24.  The DI-154 went from about $100 to $150 (+$8.55 sh ipping).

 The filters in my program can still be used at high sampling rates on a short period instrument, but the default tim e constants I use will have to be reduced.  If you can get the program to work in the way you desire with user input time constants, I can furnish a revised program with different defaults, or change the program to remember your defaults in a setup operation.

 Also note that the inverse filter used to extend the effective period is based on the passive type of sensor, whose output voltage is proportional to the velocity of a damped pendulum.

Bob McClure
bobhelenmcclure@....... Subject: Digital Filter for Seismography From: Bobhelenmcclure@....... Date: Mon, 22 Apr 2002 14:06:23 EDT Hi everyone, Here is something for you to ponder over. Since I am new to the field, what is disclosed here may be old hat to you. Your comments, please. HOW TO DIGITALLY EXTEND THE LONG PERIOD RESPONSE OF A SEISMOMETER R. E. McClure Pseudoscientist Emeritus From the electrical equivalent circuit diagram of an input series capacitor feeding an inductance and a resistance in parallel, the velocity response of a seismometer to ground velocity input is given by: G = 1/(1 - (f0/f)^2 - j*(f0/f)/Q), where f0 is the natural frequency and Q is inversely proportional to the damping of the seismometer pendulum. A Q of 0.5 is the critically damped condition. To achieve a flat filtered response, the compensating filter must have a gain of 1/G, i.e.: Gain = 1 - (f0/f)^2 - j*(f0/f)/Q . The digital implementation of such a filter is accomplished by double summation (integration) of the signal, DataIn: sum1 = sum1 + DataIn sum2 = sum2 + sum1 DataOut = DataIn + (sum1 * sigma0 * deltaT) + (sum2 * (Omega0 * deltaT)^2) ...next data sample, etc. ... where fs = samples per second , deltaT = 1 / fs , Omega0 = 2* PI * f sigma0 = (Omega0 * deltaT) / Q . For practical purposes, this filter is useless. The output very quickly becomes large without limit if there is any dc bias at all in the input data. The next necessary step is to precede the filter with a long time constant dc bias blocking filter. This helps, but is still not sufficient to make a stable filter. The final step is to close the loop on the double integration with feedback to the signal input from both the first and second integration outputs. The coefficients for the feedback make the loop behave like a very long period, damped, pendulum. The resulting output of the filter is equivalant to that obtained from a very long period sensor. This filter is built into DrumPlot.exe. The user inputs the period and damping of the sensor, and the desired filtered period. It works very well. One cannot expect to get more than a ten times improvement in long period response. You will find that the output does not truly reproduce just ground motion. There will the artifacts also appearing, such as that resulting from amplifier bias fluctuation, ambient temperature changes, atmospheric pressure changes, etc. You may also discover that wind has a large effect. I live about 1000 feet from a commuter railroad line. I pick up the vibration of passing trains, filter or no, but with the filter operating at long period, I also detect the slow earth deformation induced by the weight of the passing locomotive! The verbatim listing for the filter in the DrumPlot program is: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 'DRUMPLOT DC-BLOCKING FILTER: samplebare = sample BiasRegister = BiasRegister + samplebare / Tc0 Deltabiasregister = BiasRegister / Tc0 sampleblock = samplebare - BiasRegister BiasRegister = BiasRegister - Deltabiasregister 'DRUMPLOT EXTENDED-PERIOD FILTER: sum1 = sampleblock + sum1 - sum1 * SigmaF - sum2 * Omega2F sum2 = sum2 + sum1 sample = sampleblock + sum1 * SigmaP + sum2 * Omega2P ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The terms Omega2P, SigmaF, Omega2P, and SigmaP are: Omega2P = (OmegaPendulum * sampleperiod)^2 SigmaP = OmegaPendulum / QPendulum Omega2F = (OmegaFilter * sampleperiod)^2 SigmaF = OmegaFilter / QFilter (Set QFilter equal to 0.5) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Another nice benefit of this filter, regardless of whether a long period response is desired or not, is that the output of the seismometer, if its natural period and damping are accurately known, can be converted into one based on a standard model. There will then be a common ground on which to compare waveforms obtained from sensors of different period and damping. Robert E McClure 90 Maple Avenue Locust Valley, NY 11560 bobhelenmcclure@....... Hi everyone,

Here is something for you to ponder over.  Since I am new to the field, what is disclosed here may be old hat to you.  Your comments, please.


   HOW TO DIGITALLY EXTEND THE LONG PERIOD RESPONSE
              OF A SEISMOMETER
               R. E. McClure
          Pseudoscientist Emeritus

 From the electrical equivalent circuit diagram of an input series capacitor feeding an inductance and a resistance i n parallel, the velocity response of a seismometer to ground velocity input is given by:

    G = 1/(1 - (f0/f)^2 - j*(f0/f)/Q),

where f0 is the natural frequency and Q is inversely proportional to the damping of the seismometer pendulum.  A Q of 0.5 is  the critically damped condition.

 To achieve a flat filtered response, the compensating filter must have a gain of 1/G, i.e.:

    Gain = 1 - (f0/f)^2 - j*(f0/f)/Q .

 The digital implementation of such a filter is accomplished by double summation (integration) of the signal, DataIn:

   sum1 = sum1 + DataIn
   sum2 = sum2 + sum1
   DataOut = DataIn + (sum1 * sigma0 * deltaT) + (sum2 * (Omega0 * deltaT)^2)
   ...next data sample, etc. ...

where

   fs = samples per second ,
   deltaT = 1 / fs ,
   Omega0 = 2* PI * f
   sigma0 = (Omega0 * deltaT) / Q .

 For practical purposes, this filter is useless.  The output very quickly becomes large without limit if there i s any dc bias at all in the input data.

 The next necessary step is to precede the filter with a long time constant dc bias blocking filter.  This helps , but is still not sufficient to make a stable filter.

 The final step is to close the loop on the double integration with feedback to the signal input from both the first and second integration outputs.  The coefficients for the feedback make the loop behave like a very long period, damped, p endulum.  The resulting output of the filter is equivalant to that obtained from a very long period sensor.

 This filter is built into DrumPlot.exe.  The user inputs the period and damping of the sensor, and the desired filtered period.  It works very well.  One cannot expect to get more than a ten times improvement in long period resp onse.  You will find that the output does not truly reproduce just ground motion.  There will the artifacts also appe aring, such as that resulting from amplifier bias fluctuation, ambient temperature changes, atmospheric pressure changes, etc.  You may also discover that wind has a large effect.  I live about 1000 feet from a commuter railroad line.  I p ick up the vibration of passing trains, filter or no, but with the filter operating at long period, I also detect the slow eart h deformation induced by the weight of the passing locomotive!

 The verbatim listing for the filter in the DrumPlot program is:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    'DRUMPLOT DC-BLOCKING FILTER:
    samplebare = sample
    BiasRegister = BiasRegister + samplebare / Tc0
    Deltabiasregister = BiasRegister / Tc0
    sampleblock = samplebare - BiasRegister
    BiasRegister = BiasRegister - Deltabiasregister

    'DRUMPLOT EXTENDED-PERIOD FILTER:
    sum1 = sampleblock + sum1 - sum1 * SigmaF - sum2 * Omega2F
    sum2 = sum2 + sum1
    sample = sampleblock + sum1 * SigmaP + sum2 * Omega2P
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 The terms Omega2P, SigmaF,  Omega2P, and SigmaP are:

   Omega2P = (OmegaPendulum * sampleperiod)^2
   SigmaP  = OmegaPendulum / QPendulum

   Omega2F = (OmegaFilter * sampleperiod)^2
   SigmaF  = OmegaFilter / QFilter
   (Set QFilter equal to 0.5)  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 Another nice benefit of this filter, regardless of whether a long period response is desired or not, is that the out put of the seismometer, if its natural period and damping are accurately known, can be converted into one based on a standard m odel.  There will then be a common ground on which to compare waveforms obtained from sensors of different period and damp ing.

Robert E McClure
90 Maple Avenue
Locust Valley, NY 11560
bobhelenmcclure@....... Subject: S. T. Morrissey Obituary From: "ERIC GUINN" GUINNE@........... Date: Wed, 24 Apr 2002 23:10:05 -0400 Saint Louis University published an Obituary of Sean-Thomas Morrissey in the May "Grand Connections" Newsletter. What a loss... http://www.slu.edu/publications/gc/may_02_gc.pdf (page 11) Eric Guinn Sevierville, Tennessee __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: carbon copy From: "Barry" gbl@....... Date: Sun, 28 Apr 2002 16:42:40 -0700 Hi All Pretty quiet lately. I was looking into a Dos based server for the = sensor room. I looked at VNC but it appears to be a guest program. I did = find out about another program called "Carbon Copy". Anyone used this? = It seems to have a windows and dos version. I haven't got the evaluation = version to work on my system. Regards Barry

Hi All
 Pretty quiet lately. I was = looking into a Dos=20 based server for the sensor room. I looked at VNC but it appears to be a = guest=20 program. I did find out about another program called "Carbon Copy". = Anyone used=20 this? It seems to have a windows and dos version. I haven't got the = evaluation=20 version to work on my system. Regards
Barry
Subject: 1906 Quake Books.... From: "Kareem" temp@............. Date: Sun, 28 Apr 2002 21:00:55 -0700 Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem Message
Does anyone know = where I can=20 get any other books on the April 18, '06 Quake & fire of San = Francisco?=20 I'm interested on getting as much information as I can on the buildings = damaged=20 in SF as well as other parts of the bay area.
I already own the = book The=20 Earth Shook and the Sky Burned.
 
Thanks,
Kareem
Subject: Re: carbon copy From: "Francesco" franuc@......... Date: Mon, 29 Apr 2002 08:58:14 +0200 Hello Barry. I use CarbonCopy32 from many years to connect my system onto four remote = stations, sparse in Italy and it's works very fine. It runs under = windows only, but it's able to control a dos application. The new CC32 = edition (5.5) has a very expensive cost....=20 Look at the producer web site (now is Altiris.ltd). Try PCAnywhere. There was an older version of this program, just = created for Dos platform. Regards Francesco - Italy
Hello Barry.
I use CarbonCopy32 from many years to = connect my=20 system onto four remote stations, sparse in Italy and it's works very=20 fine.  It runs under windows only, but it's able to control a dos=20 application.  The new CC32  edition (5.5) has a very expensive = cost.... 
Look at the producer web site (now is=20 Altiris.ltd).
 
Try PCAnywhere.  There was an = older version of=20 this program, just created for Dos platform.
 
Regards
 
Francesco   - =20 Italy
Subject: recording drum on ebay From: BOB BARNS royb1@........... Date: Mon, 29 Apr 2002 09:43:46 -0400 Hi gang, Ebay has a "seismograph recording drum" item # 864881377 The auction ends 5/5. Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: recording drum on ebay From: RADIOTEL@....... Date: Mon, 29 Apr 2002 10:51:36 EDT List Members I just purchased a Rockland 1042 Dual Hi/Lo Filter from a gentleman back east (Cleveland) that filters down to .001 HZ. He has three more like it which he will sell for $75.00 each (Including shipping anywhere in the U.S.) or all three for $200.00 (including shipping). As attested to by Bob Barns, these professional filters really work well. Jim Allen __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 1906 Quake Books.... From: steve hammond shammon1@............. Date: Mon, 29 Apr 2002 10:07:21 -0700 For a scientific report I would suggest The California Earthquake of April 18, 1906 Report of the State Earthquake Commission authored by Anderw C. Lawson Chairman and published by the Carnegie Institution of Washington in 1908. It was reprinted in 1969. There is no ISBN. It is two volume set with accompanying map book. Each book is 9x11x2-inch and the map book is 9x11x1. Bound in a red cover hardback format. I found the set at the Stanford University Technical bookstore in downtown Palo Alto (I'm not certain they are still there...) about ten years ago. The text is the complete written record of the event and details the physical events by town. It also contains a massive amount of photos with detailed descriptions. Another scientific report, but is very difficult to obtain, is the USGS bulletin No. 324 published in 1907, The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and Strural Materials by Gilbert, Humphrey, Sewell and Soule. This has a great foldout panoramic photo of the city take from the top of market street after the fire was extinguished. The publication details general lesson and a few harsh words about the use of dynamite to put out a fire... Some attempts were made to stop its (the fire) progress with dynamite, but from what evidence I was able to obtain I doubt very much whether a great deal was accomplished by this means (1907, Gilbert, Humphery, Sewell and Soule). The text focuse on the structures and the effects the earthquake had on the city of San Fancisco. From the standpoint of the experience of living through the 1906 event the a book written by Gordon Thomas and MaxMorgan Weitts entitled The San Francisco Earthquake published in 1971 by Stein and Day the SBN is 8128-1360 is great reading. This 292 page hard cover book details the event by interviewing 28 survivors and taking information from many other published sources of the era. The Bibliography alone is great reading because it lists many of the lost publications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) ublications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: FW: 1906 Quake Books.... From: steve hammond shammon1@............. Date: Mon, 29 Apr 2002 10:10:04 -0700 -----Original Message----- From: steve hammond [SMTP:shammon1@.............. Sent: Monday, April 29, 2002 10:07 AM To: 'psn-l@................ PSN Subject: RE: 1906 Quake Books.... For a scientific report I would suggest The California Earthquake of April 18, 1906 Report of the State Earthquake Commission authored by Anderw C. Lawson Chairman and published by the Carnegie Institution of Washington in 1908. It was reprinted in 1969. There is no ISBN. It is two volume set with accompanying map book. Each book is 9x11x2-inch and the map book is 9x11x1. Bound in a red cover hardback format. I found the set at the Stanford University Technical bookstore in downtown Palo Alto (I'm not certain they are still there...) about ten years ago. The text is the complete written record of the event and details the physical events by town. It also contains a massive amount of photos with detailed descriptions. Another scientific report, but is very difficult to obtain, is the USGS bulletin No. 324 published in 1907, The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and Strural Materials by Gilbert, Humphrey, Sewell and Soule. This has a great foldout panoramic photo of the city take from the top of market street after the fire was extinguished. The publication details general lesson and a few harsh words about the use of dynamite to put out a fire... Some attempts were made to stop its (the fire) progress with dynamite, but from what evidence I was able to obtain I doubt very much whether a great deal was accomplished by this means (1907, Gilbert, Humphery, Sewell and Soule). The text focuse on the structures and the effects the earthquake had on the city of San Fancisco. From the standpoint of the experience of living through the 1906 event the a book written by Gordon Thomas and MaxMorgan Weitts entitled The San Francisco Earthquake published in 1971 by Stein and Day the SBN is 8128-1360 is great reading. This 292 page hard cover book details the event by interviewing 28 survivors and taking information from many other published sources of the era. The Bibliography alone is great reading because it lists many of the lost publications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: recording drum on ebay From: ChrisAtUpw@....... Date: Mon, 29 Apr 2002 13:22:42 EDT In a message dated 29/04/02, royb1@........... writes: > Hi gang, > Ebay has a "seismograph recording drum" item # 864881377 > The auction ends 5/5. > Bob Barns The motor under the red tab looks as if it is synchronous (see the phase control straps), so you may not be able to alter the drive speed. There is no sign of a pen mechanism for writing a trace. I had no difficulty in deciding not to bid for this item. Regards, Chris Chapman In a message dated 29/04/02, royb1@........... writes:

Hi gan g,
 Ebay has a "seismograph recording drum" item # 864881377
The auction ends 5/5.
Bob Barns
      The motor under the red tab looks as if it is synchronous (see the phase control strap s), so you may not be able to alter the drive speed. There is no sign of a pen mechanism for writing a trace. I had no difficul ty in deciding not to bid for this item.

      Regards,

      Chris Chapman Subject: Re: recording drum on ebay From: Doug Crice dcrice@............ Date: Mon, 29 Apr 2002 11:08:08 -0700 This is a drum recorder from a classic seismograph vault. Back in the olden days, seismometers were connected to an optical galvanometer, which is kind of an analog voltmeter with a tiny mirror instead of a needle. They are quite sensitive, and a small signal causes the mirror to twist. In the vault, there is a lamp which shines a light beam on the mirror then back to the drum. With perhaps a 4 meter optical path, you get optical leverage (or amplification), so it's possible to make a pretty sensitive seismograph with no electronics at all. The drum is loaded with photographic paper, and the light writes a classic drum recording on the paper (which of course has to be developed). To translate the traces each revolution, the drum has to move sideways, which is why the photo shows the device as being much wider than the actual drum. When the technician comes by daily, he changes the paper, develops the record, and re-positions the drum at the start point (besides checking the equipment). If somebody has a pen motor laying around, you could make it into a modern pen-and-ink system, and it might be useful for that. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: drumplot program From: "Norman Davis" wb6shi@........ Date: Mon, 29 Apr 2002 13:51:52 -0700 Bob McClure I must have missed it, but I don't see a link to where I can download your software Norm WB6SHI email: wb6shi@........ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: recording drum on ebay From: CapAAVSO@....... Date: Mon, 29 Apr 2002 18:07:30 EDT In a message dated 4/29/02 7:08:54 PM GMT Daylight Time, dcrice@............ writes: (See Below) Hi Gang, I have one of these you can have for $50, which is the first bid on the eBay instrument. Mine, however, is the complete instrument with the very sensitive galvanometer Doug mentions that needs no electronics. It also comes with the lamp and optics to focus the light beam on the galvanometer's mirror and reflect it from there to the light sensitive paper on the drum. The length of the light beam is 1 meter. It is a complete instrument made by Sprengnether Instrument Company in St. Louis, Missouri, USA. It is packed in its original wooden shipping box and has never been unpacked. I did open the box to make sure everything is there. It is, including the owners manual. The galvanometer and light beam optics are wrapped in pages from the 23 July 1973, St. Louis Dispatch newspaper. I am old (84) and would like to find a good home for this beautiful precision instrument because I will not live long enough to do anything with it. There are too many other things I must do before my time comes and I must go. If you are interested I can send pictures copied from the owner's manual. Cap Hossfield 935 Franklin Turnpike Hewitt, New Jersey 07421 USA ------------------------------------------------------------------------------ ------------------------------------- << Subj: Re: recording drum on ebay Date: 4/29/02 7:08:54 PM GMT Daylight Time From: dcrice@............ (Doug Crice) Sender: psn-l-request@.............. Reply-to: psn-l@.............. To: psn-l@.............. This is a drum recorder from a classic seismograph vault. Back in the olden days, seismometers were connected to an optical galvanometer, which is kind of an analog voltmeter with a tiny mirror instead of a needle. They are quite sensitive, and a small signal causes the mirror to twist. In the vault, there is a lamp which shines a light beam on the mirror then back to the drum. With perhaps a 4 meter optical path, you get optical leverage (or amplification), so it's possible to make a pretty sensitive seismograph with no electronics at all. The drum is loaded with photographic paper, and the light writes a classic drum recording on the paper (which of course has to be developed). To translate the traces each revolution, the drum has to move sideways, which is why the photo shows the device as being much wider than the actual drum. When the technician comes by daily, he changes the paper, develops the record, and re-positions the drum at the start point (besides checking the equipment). If somebody has a pen motor laying around, you could make it into a modern pen-and-ink system, and it might be useful for that. -- Doug Crice http://www.georadar.com 19623 Via Escuela Drive phone 408-867-3792 Saratoga, California 95070 USA fax 408-867-4900 >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: carbon copy From: "Larry Cochrane" cochrane@.............. Date: Mon, 29 Apr 2002 18:17:58 -0700 Barry, If you are running SDR (it's hard to keep track of who's running = what....) on your DOS system you probably will not be able to run any = other programs other then SDR on the system. There is a DOS version of = PC Anywhere, a program like VNC and carbon copy, but someone on this = list tried it a few years ago and it interfered with the 1 millisecond = interrupt generated by the A/D board. This 1 ms interrupt is used for = time keeping. If you want to do more then simple datalogging I suggest you upgrade to = my new WinSDR program. This program has many features that are not = supported in SDR. These features include creating GIF images of your = sensor data, see this page for an example = http://www.seismicnet.com/currentseismicity.html, FTP uploading of new = even files created by WinSDR and digital filtering of the data supplied = to the event triggering process. See this page for more information on WinSDR = http://www.seismicnet.com/winsdr/. -Larry Cochrane Redwood City, PSN ----- Original Message -----=20 From: Barry=20 To: psn-l@................. Sent: Sunday, April 28, 2002 4:42 PM Subject: carbon copy Hi All Pretty quiet lately. I was looking into a Dos based server for the = sensor room. I looked at VNC but it appears to be a guest program. I did = find out about another program called "Carbon Copy". Anyone used this? = It seems to have a windows and dos version. I haven't got the evaluation = version to work on my system. Regards Barry
Barry,
 
If you are running SDR (it's = hard to keep=20 track of who's running what....) on your DOS system you probably = will not=20 be able to run any other programs other then SDR on the system. There is = a DOS=20 version of PC Anywhere, a program like VNC and carbon copy, but someone=20 on this list tried it a few years ago and it interfered with the 1=20 millisecond interrupt generated by the A/D board. This 1 ms = interrupt is=20 used for time keeping.
 
If you want to do more then simple = datalogging I=20 suggest you upgrade to my new WinSDR program. This program has = many=20 features that are not supported in SDR. These features=20 include creating GIF images of your sensor data, see this page = for an=20 example http://www.seis= micnet.com/currentseismicity.html, FTP=20 uploading of new even files created by WinSDR and digital filtering of = the data=20 supplied to the event triggering process.
 
See this page for more information on = WinSDR http://www.seismicnet.com/wins= dr/.
 
-Larry Cochrane
Redwood City, PSN
 
 
----- Original Message -----
From:=20 Barry
Sent: Sunday, April 28, 2002 = 4:42=20 PM
Subject: carbon copy

Hi All
 Pretty quiet lately. I was = looking into a=20 Dos based server for the sensor room. I looked at VNC but it appears = to be a=20 guest program. I did find out about another program called "Carbon = Copy".=20 Anyone used this? It seems to have a windows and dos version. I = haven't got=20 the evaluation version to work on my system. Regards
Barry
Subject: Re: ROCKLAND DUAL HI/LO 1042 FILTERS From: RADIOTEL@....... Date: Mon, 29 Apr 2002 21:40:47 EDT __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ROCKLAND DUAL HI/LO 1042 FILTERS From: RADIOTEL@....... Date: Mon, 29 Apr 2002 21:48:56 EDT I apologize for not including the email address of the company that is selling the Rockland dual Hi/Lo 1042 filters this morning when I posted the information to the list. These filters filter down below .1 Hz and therefore can be used for long period instruments. As I stated in my previous posting, the price is certainly right at $75.00 per each including UPS delivery or $200.00 for three including UPS delivery. The owner of the company is a guy named JT who can be reached at the following email address: jtacoustic@.......... I also apologize for hitting the wrong button earlier and sending an empty message posting. Jim Allen Cerritos, California __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 1906 Quake Books.... From: "Kareem" temp@............. Date: Mon, 29 Apr 2002 20:39:49 -0700 Thanks Steve. I've heard of those books and the fact that they might be difficult to obtain. I look hard. Thanks again. Kareem -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of steve hammond Sent: Monday, April 29, 2002 10:07 AM To: 'psn-l@................ PSN Subject: RE: 1906 Quake Books.... For a scientific report I would suggest The California Earthquake of April 18, 1906 Report of the State Earthquake Commission authored by Anderw C. Lawson Chairman and published by the Carnegie Institution of Washington in 1908. It was reprinted in 1969. There is no ISBN. It is two volume set with accompanying map book. Each book is 9x11x2-inch and the map book is 9x11x1. Bound in a red cover hardback format. I found the set at the Stanford University Technical bookstore in downtown Palo Alto (I'm not certain they are still there...) about ten years ago. The text is the complete written record of the event and details the physical events by town. It also contains a massive amount of photos with detailed descriptions. Another scientific report, but is very difficult to obtain, is the USGS bulletin No. 324 published in 1907, The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and Strural Materials by Gilbert, Humphrey, Sewell and Soule. This has a great foldout panoramic photo of the city take from the top of market street after the fire was extinguished. The publication details general lesson and a few harsh words about the use of dynamite to put out a fire... Some attempts were made to stop its (the fire) progress with dynamite, but from what evidence I was able to obtain I doubt very much whether a great deal was accomplished by this means (1907, Gilbert, Humphery, Sewell and Soule). The text focuse on the structures and the effects the earthquake had on the city of San Fancisco. From the standpoint of the experience of living through the 1906 event the a book written by Gordon Thomas and MaxMorgan Weitts entitled The San Francisco Earthquake published in 1971 by Stein and Day the SBN is 8128-1360 is great reading. This 292 page hard cover book details the event by interviewing 28 survivors and taking information from many other published sources of the era. The Bibliography alone is great reading because it lists many of the lost publications that have been written about the 1906. The chronology of the book is interesting because it's chapter heading and text leads you though the hours following the event, Friday April 20, 1906 Midnight to 6 A.M. This book has been the prim reference source for many of the current feature articles you read. Try the used book sellers-- You may still find a copy. Regards, Steve Hammond PSN Aptos, CA -----Original Message----- From: Kareem [SMTP:temp@.............. Sent: Sunday, April 28, 2002 9:01 PM To: PSN Subject: 1906 Quake Books.... Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area. I already own the book The Earth Shook and the Sky Burned. Thanks, Kareem << File: ATT00001.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Interesting article on using GPS receivers as a strong motion sensor From: "Larry Cochrane" cochrane@.............. Date: Tue, 30 Apr 2002 14:47:59 -0700 http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=15044 -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 1906 Quake Books.... From: Karl Cunningham karlc@.......... Date: Tue, 30 Apr 2002 17:47:34 -0700 Kareem -- I second Steve Hammond's recommendation about the Gordon Thomas and Max Morgan Witts book titled "The San Francisco Earthquake". Once I started it, I just couldn't put it down. My wife got my copy on ebay -- you might try there. Regards. Karl Cunningham --On Sunday, April 28, 2002 9:00 PM -0700 Kareem wrote: > > Does anyone know where I can get any other books on the April 18, '06 > Quake & fire of San Francisco? I'm interested on getting as much > information as I can on the buildings damaged in SF as well as other > parts of the bay area. I already own the book The Earth Shook and the > Sky Burned. > > Thanks, > Kareem __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: RE: 1906 Quake Books.... From: "Kareem" temp@............. Date: Tue, 30 Apr 2002 19:49:47 -0700 Thanks so much Karl, I've never sought Ebay for anything before. I wouldn't know where to start. -----Original Message----- From: psn-l-request@.............. [mailto:psn-l-request@............... On Behalf Of Karl Cunningham Sent: Tuesday, April 30, 2002 5:48 PM To: psn-l@.............. Subject: Re: 1906 Quake Books.... Kareem -- I second Steve Hammond's recommendation about the Gordon Thomas and Max Morgan Witts book titled "The San Francisco Earthquake". Once I started it, I just couldn't put it down. My wife got my copy on ebay -- you might try there. Regards. Karl Cunningham --On Sunday, April 28, 2002 9:00 PM -0700 Kareem wrote: > > Does anyone know where I can get any other books on the April 18, '06 > Quake & fire of San Francisco? I'm interested on getting as much > information as I can on the buildings damaged in SF as well as other > parts of the bay area. I already own the book The Earth Shook and the > Sky Burned. > > Thanks, > Kareem __________________________________________________________ Public Seismic Network Mailing List (PSN-L) __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: 1906 Quake Books.... From: ian ian@........... Date: Tue, 30 Apr 2002 17:37:07 -1000 ebay is pretty amazing: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1533403767 waiting to be bought... Kareem wrote: >Thanks so much Karl, I've never sought Ebay for anything before. I >wouldn't know where to start. > >-----Original Message----- >From: psn-l-request@.............. [mailto:psn-l-request@............... >On Behalf Of Karl Cunningham >Sent: Tuesday, April 30, 2002 5:48 PM >To: psn-l@.............. >Subject: Re: 1906 Quake Books.... > > >Kareem -- > >I second Steve Hammond's recommendation about the Gordon Thomas and Max >Morgan Witts book titled "The San >Francisco Earthquake". Once I started it, I just couldn't put it down. >My wife got my copy on ebay -- you might try there. > >Regards. >Karl Cunningham > > >--On Sunday, April 28, 2002 9:00 PM -0700 Kareem >wrote: > >>Does anyone know where I can get any other books on the April 18, '06 >>Quake & fire of San Francisco? I'm interested on getting as much >>information as I can on the buildings damaged in SF as well as other >>parts of the bay area. I already own the book The Earth Shook and the >> > >>Sky Burned. >> >>Thanks, >>Kareem >> > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. > > ebay is pretty amazing:

http://cgi.ebay.com/ws/eB ayISAPI.dll?ViewItem&item=1533403767

waiting to be bought...

Kareem wrote:
Thanks so much Karl, I've never sought Ebay for anything before. I
wouldn't know where to start.

-----
Original Message-----
From: psn-l-request@web
tronics.com [mailto:psn-l-request@.............
m]
On Behalf Of Karl Cunningham
Sent: Tuesday, April 30, 2002 5:48 PM
To: psn-l@..............
Subject: Re: 1906 Quake Books....


Kareem --

I seco
nd Steve Hammond's recommendation about the Gordon Thomas and Max
Morgan Witts book titled "The San 
Francisco Earthquake
".  Once I started it, I just couldn't put it down.
My wife got my copy on ebay -- you might try there.

Regards.
K
arl Cunningham


--On Sunday, April 28, 2002 9:00 PM -0700 Kareem <temp@.............>
wrote:

Does anyone know where I can get any other books on the April 18, '06 
Quake & fire of San Francisco? I
'm interested on getting as much 
information as I can on the buildings damaged in SF as well as other 
parts of the bay 
area.  I already own the book The Earth Shook and the

Sky Burned.
  
Thanks,
Kareem


__________________________________________________________

Public Seismic Network Mail
ing List (PSN-L)

To leave this list email PSN-L-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.



__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

To
 leave this list email PSN-L-REQUEST@...........
COM with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.



Subject: Re: 1906 Quake Books.... From: John Lahr johnjan@........ Date: Wed, 01 May 2002 06:26:21 -0600 Did you check with the USGS library in Menlo Park?  In addition to books they
could have copies of photographs.

Cheers,
John

At 09:00 PM 4/28/2002 -0700, you wrote:
Does anyone know where I can get any other books on the April 18, '06 Quake & fire of San Francisco? I'm interested on getting as much information as I can on the buildings damaged in SF as well as other parts of the bay area.
I already own the book The Earth Shook and the Sky Burned.
 
Thanks,
Kareem

John C. Lahr
1925 Foothills Road
Golden, CO 80402
Phone: (303) 215-9913 
john@........
http://lahr.org/john-jan/ Subject: RE: 1906 Quake Books.... From: steve hammond shammon1@............. Date: Wed, 1 May 2002 13:10:06 -0700 Hi John, I had heard the USGS book store closed... Do you know if they are still on Middlefield Road in Palo Alto? Regards Steve Hammond PSN Aptos, CA -----Original Message----- From: John Lahr [SMTP:johnjan@......... Sent: Wednesday, May 01, 2002 5:26 AM To: psn-l@.............. Subject: Re: 1906 Quake Books.... << File: ATT00000.html >> __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Digest from 05/01/2002 00:01:15 From: Bill Steele bill@...................... Date: Thu, 2 May 2002 09:11:20 -0700 (PDT) You can also find many great images at the National Earthquake Engineering Information Center (NEIC) at UC Berkeley. Online access at: http://nisee.berkeley.edu/ Seems to be broken but they suggest you call the librarian there for help. Bill ******************************************************************** William P. Steele Phone: 206-685-5880 Director of Information Services Pacific Northwest Seismograph Network (PNSN) UW Earth and Space Sciences Box 351310 Seattle, WA 98195-1310 http://www.ess.washington.edu/SEIS/ bill@.................. ******************************************************************** On Thu, 2 May 2002 psn-l-digest-request@.............. wrote: > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > | Message 1 | > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > Subject: Re: 1906 Quake Books.... > From: John Lahr > Date: Wed, 01 May 2002 06:26:21 -0600 > > > Did you check with the USGS library in Menlo Park?  In addition to > books they
> could have copies of photographs.

> Cheers,
> John

> At 09:00 PM 4/28/2002 -0700, you wrote:
>

Does anyone know where > I can get any other books on the April 18, '06 Quake & fire of San > Francisco? I'm interested on getting as much information as I can on the > buildings damaged in SF as well as other parts of the bay > area.
> I already own the book The Earth Shook and the Sky > Burned.
>  
> Thanks,
> Kareem
>

> John C. Lahr
> 1925 Foothills Road
> Golden, CO 80402
> Phone: (303) 215-9913 
> john@........
> http://lahr.org/john-jan/ > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > | Message 2 | > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > Subject: RE: 1906 Quake Books.... > From: steve hammond > Date: Wed, 1 May 2002 13:10:06 -0700 > > Hi John, I had heard the USGS book store closed... Do you know if they are still on Middlefield Road in Palo Alto? > > Regards Steve Hammond PSN Aptos, CA > > -----Original Message----- > From: John Lahr [SMTP:johnjan@......... > Sent: Wednesday, May 01, 2002 5:26 AM > To: psn-l@.............. > Subject: Re: 1906 Quake Books.... > > << File: ATT00000.html >> > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-DIGEST-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: ebay seismom.? From: BOB BARNS royb1@........... Date: Sat, 04 May 2002 10:08:51 -0400 Hi gang, Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether seismometer. I don't think that is a seismometer but may be a magnetometer or a gravimeter. What is it? Bob Barns __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: Hammonds hammond@........... Date: Sat, 04 May 2002 07:43:04 -0800 Bob, it is indeed a Sprengnether magnetometer. Bob Hammond http://apsn.awcable.com At 06:08 AM 5/4/2002, you wrote: >Hi gang, > Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether >seismometer. >I don't think that is a seismometer but may be a magnetometer or a >gravimeter. > What is it? >Bob Barns >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: meredithlamb meredithlamb@............. Date: Sat, 04 May 2002 11:25:23 -0600 Bob & Bob and/or all, It looks to have a optical lens atop the unit, that perhaps has "grid marks" somewhere for a value reading? Aren't magnetometers/gravimeters essentially (for the age of the instrument), "simply" (likely a understatement?), a vertical mass on a special spring? Meredith Lamb Hammonds wrote: > Bob, it is indeed a Sprengnether magnetometer. > > Bob Hammond > http://apsn.awcable.com > > At 06:08 AM 5/4/2002, you wrote: > >Hi gang, > > Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether > >seismometer. > >I don't think that is a seismometer but may be a magnetometer or a > >gravimeter. > > What is it? > >Bob Barns > >__________________________________________________________ > > > >Public Seismic Network Mailing List (PSN-L) > > > >To leave this list email PSN-L-REQUEST@.............. with > >the body of the message (first line only): unsubscribe > >See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: Hammonds hammond@........... Date: Sat, 04 May 2002 09:44:01 -0800 Meridith, I think this particular magnetometer has one or more small magnets attached to a hair-like quartz fiber held vertically and under tension. Ambient light (coming in from that long frosted slit on the top and side of the instrument) shines on a tiny mirror which is also attached to the quartz fiber. Any perturbation of the magnetic field causes the magnet(s) and the mirror to move and thus moving the reflected light beam on a scale. The scale is read through the lens at the top of the instrument. If the quartz fiber is broken, the instrument is useless. I haven't found a source for them. Bob Hammond apsn At 09:25 AM 5/4/2002, you wrote: >Bob & Bob and/or all, > >It looks to have a optical lens atop the unit, that perhaps >has "grid marks" somewhere for a value reading? Aren't >magnetometers/gravimeters essentially (for the age of the >instrument), "simply" (likely a understatement?), a vertical >mass on a special spring? > >Meredith Lamb > >Hammonds wrote: > > > Bob, it is indeed a Sprengnether magnetometer. > > > > Bob Hammond > > http://apsn.awcable.com > > > > At 06:08 AM 5/4/2002, you wrote: > > >Hi gang, > > > Ebay item # 865745339 (ends 5/10) is advertised as a Sprengnether > > >seismometer. > > >I don't think that is a seismometer but may be a magnetometer or a > > >gravimeter. > > > What is it? > > >Bob Barns > > >__________________________________________________________ > > > > > >Public Seismic Network Mailing List (PSN-L) > > > > > >To leave this list email PSN-L-REQUEST@.............. with > > >the body of the message (first line only): unsubscribe > > >See http://www.seismicnet.com/maillist.html for more information. > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See http://www.seismicnet.com/maillist.html for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: meredithlamb meredithlamb@............. Date: Sat, 04 May 2002 14:24:05 -0600 Bob, Thanks....that all makes sense. Suspect anyone buying such would run the risk of the fiber breaking via shipment; even with/without any fiber tension loosening/tightening mechanical device. Interesting gizmo though. Meredith Hammonds wrote: > Meridith, I think this particular magnetometer has one or more small > magnets attached to a hair-like quartz fiber held > vertically and under tension. > Ambient light (coming in from that long frosted slit on the top and side of > the instrument) shines on a tiny mirror which > is also attached to the quartz fiber. Any perturbation of the magnetic > field causes the magnet(s) and the mirror to move > and thus moving the reflected light beam on a scale. The scale is read > through the lens at the top of the instrument. > > If the quartz fiber is broken, the instrument is useless. I haven't found > a source for them. > > Bob Hammond > apsn > __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: ebay seismom.? From: ChrisAtUpw@....... Date: Sat, 4 May 2002 21:19:08 EDT In a message dated 04/05/02, hammond@........... writes: > Meredith, I think this particular magnetometer has one or more small magnets > attached to a hair-like quartz fibre held vertically and under tension. Hi Bob, Horizontal field magnetometers normally have horizontal viewing systems, not a vertical one like this instrument. It could be an instrument for measuring vertical magnetic field changes. They have two horizontal magnets and a mirror on a horizontal quartz spring + suspension filament + mirror. The quartz components were made as an integral system, fused together and are not repairable. > Ambient light (coming in from that long frosted slit on the top and side of > the instrument) shines on a tiny mirror which is also attached to the > quartz fibre. Any perturbation of the magnetic field causes the magnet(s) > and the mirror to move > and thus moving the reflected light beam on a scale. The scale is read > through the lens at the top of the instrument. A calibrated ground glass scale may be illuminated by light from the window and viewed by a lens + graduated eyepiece from it's reflection in the mirror. > If the quartz fibre is broken, the instrument is useless. I haven't found > One thing that puzzles me is that while the base swivels, there does not seem to be a graduation ring on it. There is no obvious clamping mechanism. There is no offset adjustment knob on the side that you can see. I would have expected the lady to have shown it if there were one. Perhaps someone might send the photo to Sprengnether? I am rather doubtful about the box being cherry wood. Mahogany was usually used for instrument cases. Regards, Chris Chapman In a message dated 04/05/02, hammond@........... writes:

Meredi th, I think this particular magnetometer has one or more small magnets attached to a hair-like quartz fibre held vertically and under tension.


Hi Bob,

     Horizontal field magnetometers normally have horizontal viewing systems, not a vertical one like this instrument. It could be an instrument for measuring vertical magnetic field changes. They have two horizontal magnets and a mirror on a horizontal quartz spring + suspension filament + mirror. The quartz components were made as an integral syst em, fused together and are not repairable.

Ambient light (coming in from that long frosted slit on the top and side of the instrument) shines on a tiny mirror which is also attached to the quartz fibre.  Any perturbation of the magnetic field causes the magnet(s) and the mirror to move
and thus moving the reflected light beam on a scale.  The scale is read
through the lens at the top of the instrument.


       A calibr ated ground glass scale may be illuminated by light from the window and viewed by a lens + graduated eyepiece from it's reflect ion in the mirror.

If the quartz fibre is broken, the instrument is useles s.  I haven't found
a source for them.


      One thing that puzzles me is that while the base swivels, there does not seem to be a graduation ring on it. There is no obvious clamping mechanism. There is no offset adjustment knob on the side that you can see. I would have expected the lady to have shown it if there were one. Perhaps someone might send the photo to Sprengnether? I am rather doubtful about the box being cherry wood. Mahogany was usually used for instrument cases.

      Regards,

      Chris Chapman Subject: Re: Focal Mechanism Program From: John Lahr johnjan@........ Date: Tue, 07 May 2002 07:44:24 -0600 Hi George, Thanks for fixing the program. It's a great use of the Internet. If I knew how to program in Java it would be fun to have a similar program with sliders to control the three parameters. On a trivial note, there is a typo on this line: Enter strike, sip and slip: Cheers, John At 11:28 AM 5/7/2002 +0100, you wrote: >Hi John - > > Thanks for your warning about the inoperability of the program. I'll >used your info to troubleshoot the problem, and it seems some shared libraries >weren't locatable. It should work now (at least it does on my Netscape 3.01). > > George > > Date: Sat, 20 Apr 2002 19:10:43 -0600 > To: George.Helffrich@............. > From: John Lahr > Subject: Focal Mechanism Program > > George Helffrich > Bristol University > > Dear George, > > I have been trying out your focal mechanism plotting program: > http://www1.gly.bris.ac.uk/~george/focmec.html > and get the following error message: > System failed to produce a focal mechanism! Error messages read: > > Cheers, > John Lahr * John C. and Jan H. Lahr * JohnJan@........ * 1925 Foothills Road * Golden, Colorado 80401-1718 * Phone: (303) 215-9913 * http://lahr.org/john--jan/ __________________________________________________________ Public Seismic Network Mailing List (PSN-L) Subject: Re: Focal Mechanism Program From: "George Harris" gjharris@............. Date: Tue, 7 May 2002 16:23:59 -0700 John, Somehow this message came to me (George Harris) from PSN. You may want to resent it to the proper place. George Harris ----- Original Message ----- From: "John Lahr" To: "George Helffrich +44 117 954 5437" Cc: Sent: Tuesday, May 07, 2002 6:44 AM Subject: Re: Focal Mechanism Program > Hi George, > > Thanks for fixing the program. It's a great use of the Internet. > If I knew how to program in Java it would be fun to have a similar > program with sliders to