Hi Richard-  The Geosource is a good geophone, but not adequate for
earthquake recording, too high a frequency response at 14 Hz, you will
need the 4.5 Hz or 1 Hz response.  Your questions and many more you have,
can be anwsered by going to the Public Seismic Network web page-
http://psn.quake.net/geophone/index.html for geophones that can record
earthquakes.

More general information is at:  http://psn.quake.net

Yes Pleasanton is an active area...
Best Regards-
Jim O'Donnell
UNLV
On Mon, 23 Jun 2003 22:55:20 -0700 Richard Schwaninger
 writes:
> Hello group.
> 
> I'm new here but have a couple of questions. Please excuse me if 
> this
> has been answered before, I did do a quick search and didn't come 
> up
> with anything. If so please point me to the right place - archive 
> or
> google.
> 
> I'm in Pleasanton, and so should have something to look at every 
> once in
> a while. I'm starting to set something up at home. I thought I'd 
> first
> look for local events and so purchased a few Geosource MD-100 
> geophones.
> They are labeled 14Hz, 330 Ohms.
> 
> Looking at pictures, I've seen similar units arranged in a cluster 
> in a
> X-Y-Z configuration. The MD-100s I have only work in one axis, so I
> figure I will not be able to construct a 3 axis unit with these
> geophones? Is there a work-around? Are there other available (in the 
> $20
> range) units which work on their sides?
> 
> The second question, which really should of been first, is: are 
> these
> geophones adequate or appropriate for monitoring local events?
> 
> Thanks for any information.
> 
> Richard
> 
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