Jim,

Thanks for the comments. About the frequency response. Are these
geophones
damped to such a large extent that even if I roll off the output at,
say,
10 Hz, I still wouldn't have anything resembling a useful output? I only
intend these to monitor local events. I've figured it easier to first
look
at local events with commercial sensors and work on the electronics and
data gathering/recording. Later I do intend to construct some other
sensors for teleseisms.

Thanks again,

Richard

Jim ODonnell wrote:
> 
> 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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