PSN-L Email List Message
Subject: Honshu quake 7.4.10
From: Thomas Dick dickthomas01@.............
Date: Mon, 05 Jul 2010 08:56:47 -0500
It has been very quiet here in southern Indiana for about four days.
When I saw the USGS list of quakes yesterday, I thought I would see a
good record. I worked it up and was disappointed so I didn't post it
until today after I saw Bob's (Locust Valley). If you look prior to the
arrival of the P wave, there is something there in the frequency of .05
hz (in the one min 40 sec prior to P arrival for Honshu) that appears
directional. (e.g. the peak is greater on the E-W than on the N-S and is
NOT present on the vertical). The Texas posts show a peak on the
vertical too. Since this peak is not synchonous with the S wave arrival
from Honshu, is it wish to suppose this is another quake since the Texas
stations show a peak on the vertical and probably are closer to it?
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