PSN-L Email List Message
Subject: Re: are these real?
From: "tdick" dickthomas01@.............
Date: Fri, 7 May 2004 22:41:12 -0500
I suppose I am trying to filter too much. Look at just the Guatemala quake
of the 3d of May -- a big one. It was triggered by WinSDR. (The seismograms
that I first saw 50 years ago didn't have all this filtering.) I think you
expect to see seismograms that look like test 1 and test 1a -- not in a
folder -- right?? -- same data used to do those in the May folder. I can't
get away from seeing the wave shape at "P" and "S" etc. so the horizontal
units appeal to be -- as well as too much filtering; the east-west geophone
seems to lack sensitivity - even the north-south picks up this quake better.
I am in a high noise area. The geophones are buried four foot down about ten
feet from a 4 1/2 acre lake. The Lehmans and HM vertical are about the same
depth but in the basement of the house. There are two strip mines (coal)
within forty miles and two rock quarries within 120 miles. The house is
fifty years old and was built on swamp land. Period on the Lehmans is around
5 secs -- I have no idea what the vertical is.
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