PSN-L Email List Message

Subject: Re: Thunder induced ground motion.
From: "Geoff" gmvoeth@...........
Date: Sun, 7 Aug 2005 12:43:10 -0700

I have been watching grams for quite a few years
now through various thunderstorms and found practically no
effects below 2 Hz which is the only place I look
I recommend you concentrate your efforts at frequencies
over 10Hz and possibly 20Hz if you are interested in the
effects of thunder.
If you get a trace from a helicopter flying over
you are probably good for thunder also.


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