PSN-L Email List Message

Subject: Re: Ocean noise ?
From: Thomas Dick dickthomas01@.............
Date: Mon, 06 Apr 2009 14:30:39 -0500

Jón Frímann
I was watching something between 17:22 and 17:30 here in southern 
Indiana USA. I was waiting for an update to the earthquake list which 
hasn't shown any new listings since about 13:00. I thought maybe 
aftershocks in Italy. I show a minor peak on FFT's around .5 but a much 
more pronounced peak at .05 on the Lehmans. What has confused me is the 
high "peaks" on FFT's on the 4.5 hz geophones from .05 down to .005. 
(Maybe "peaks" aren't the word for it --- but there is a general down 
slope from .005 to .5 which isn't there normally....and all the 
horizontal units show this trend.) tom d

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