PSN-L Email List Message

Subject: Re: Geosource MD-100 geophones
From: Richard Schwaninger richard@...............
Date: Wed, 25 Jun 2003 06:32:55 -0700


Ok, seems I started off with the wrong sensors. I plan to do just as you
mention below; build the electronics, data collection and storage. Then
I can move on to some better or more suitable sensors.

Last night I did do some quick testing on the MD-100s. The are
responsive down to 3 Hz. Not a lot of signal and certainly much less
than at 10 or 20 Hz.



John or Jan Lahr wrote:
> Hi Richard,
> I agree with the various comments  -- a small 10 Hz geophone is not going
> to work very well for small, regional events.  There are two problems:  1 - the
> natural frequency of 10 Hz is a bit high (2 Hz would be better) and 2 -
> the sensitivity, even at 10 Hz is not great, as these are very small units
> designed to pick up rather large signals.
> Having said that, the price is right and it couldn't hurt to give them a
> try.  You would need to set up a filter/amplifier/recorder system to test
> them out and during the test you could be building a Lehman or purchasing
> a lower frequency geophone.
> Cheers,
> John


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