PSN-L Email List Message
Subject: Re: Opinion on seismometer
From: Pete Rowe ptrowe@.........
Date: Wed, 13 Jun 2007 20:11:30 -0700 (PDT)
OK, thanks larry. I sent it to seismicnet. If all is
well, everyone should be able to see it at:
--- Larry Cochrane wrote:
> Hi All,
> This is a reminder that you can not send attachments
> to the PSN-L list. If you have a
> file you would like to share with the group you will
> need to place it on a web/ftp
> server somewhere and send the link to the file to
> the list. If you do not have access
> to a web server I can place the file on my system.
> If you have a PSN event file you would like to share
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> to event@.............. as attachments. The event
> file(s) will show up on this page
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> Larry Cochrane
> Redwood City, PSN
> Pete Rowe wrote:
> > Hi all
> > I sent the following message with a pdf of my
> > recording but it bounced back as too large for the
> > group. I'm not sure how to send it any other way.
> > Pete
> > Here is my recording of the Guatemalan quake
> today. As
> > Jan mentioned, my seismometer is the size of a
> > shoebox, has a three second period, is critically
> > damped with a resistor across the coil, has almost
> > weight on the boom, and I can see a 7.0 anywhere
> > earth. The suspension is two fine steel wires
> > E string) both of which are in tension. This sits
> > the dirt under my house. The noise level is higher
> > than normal today due to wind in the trees.
> > I have a very quiet baseline. It has been running
> > almost untouched since 1988.
> > regards,
> > Pete Rowe
> > San Jose, CA
> > --- Jan Froom wrote:
> >> I can remember when Pete Rowe and I first started
> >> playing around with
> >> amateur seismometers... I built a large unit with
> >> long boom with a
> >> very heavy mass. Pete built a little unit, with
> >> mass on his boom at
> >> all. I had my unit mounted on three massive
> >> piers... Pete set
> >> his unit on a scrap of 2X4 under his house...
> >> Funny thing... we both got about the same
> >> and Pete didn't
> >> have half the problems I had.
> >> Pete finally put a small fish weight on the end
> >> his boom... I sure...
> >> simply to appease me.
> >> I've also come to the conclusion that the antique
> >> seismometers I've
> >> collected all have large masses and huge coils
> >> simply because they had
> >> to generate enough power to drive a pen motors
> >> directly, with no
> >> external amplification. With today's amplifiers
> >> technology you can
> >> do a whole lot more with a whole lot less.
> >> Since the only response to my query about drum
> >> recorders came from
> >> Chris... I took his advice and took an aspirin
> >> thought about my
> >> problem. I've decided to take advantage of the
> >> antique nature of what I
> >> have, and capitalize on that. Part of what I've
> >> tried to inspire in the
> >> kids I've worked with... is the simplicity of a
> >> seismic monitoring
> >> system... the simplicity of a whole lot of
> >> scientific
> >> devices... what better way then to let them see
> >> simple pieces up
> >> close... and if it looks a bit "Rube
> >> Goldbergish"... well that will be
> >> kool too.
> >> Jan in Gilroy.
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