PSN-L Email List Message

Subject: clarification about force balance instruments
From: Randall Peters PETERS_RD@..........
Date: Sat, 12 Feb 2011 08:30:51 -0500

David &Brent,
        I did not mean to sound disparaging about seismographs such as your=
 own superb
instrument that I've been watching at Larry's site that you mentioned.  Am =
glad to hear that quite a few amateurs have followed successfully in the fo=
of the famous individuals you mentioned.  What I wanted to point out is tha=
the VolksMeter is indeed broadband.  I have never suggested that it could s=
all earthquakes as well as yours does.
 The Chile event in the last 24 hours proves your=20
point.  But it is true that every VM logging to the same site also picked i=
t up=20
(though less impressively). The ones to whom my email was directed are
probably surprised that an instrument whose period is about 1s could=20
ever do so. I can also with it look at spectral components having much
longer periods than you mention (even those of Streckeisen origin).
Incidently, John Berger has recently built a gravitational pendulum
that uses optical (laser sensing).  I hope that his interest will motivate
others  to look at this mostly untapped area.

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