PSN-L Email List Message

Subject: Clarification on last request about seismometer orientation
From: "GPayton" gpayton@.............
Date: Sun, 27 Sep 2009 14:43:31 -0500


Everyone might not have the book that I quoted from; so, I will quote from 
it"
    Figure 1.1-4 shows a seismogram from an earthquake at a depth of 650 km 
in the Tonga subduction zone recorded in Hawaii. "The seismometer is 
oriented such that all the arrivals are shear waves." In addition ....

The figure display shows only S, ScS,sS and repeated shear wave bounces. 
Since is specifically points out the orientation of the receiver, it caught 
my attention.  Maybe, the software filters out P-wave arrivals, I don't 
know.  The statement was an anomaly to my virgin ears!

Regards to all,
Jerry 







Everyone might not have the book that I quoted from; so, I will = quote from=20 it"
    Figure 1.1-4 shows a seismogram from an = earthquake at a=20 depth of 650 km in the Tonga subduction zone recorded in=20 Hawaii. "The seismometer is oriented such that all the = arrivals=20 are shear waves." In addition ....
 
The figure display shows only S, ScS,sS and repeated shear wave=20 bounces.  Since is specifically points out the orientation of the = receiver,=20 it caught my attention.  Maybe, the software filters out P-wave = arrivals, I=20 don't know.  The statement was an anomaly to my virgin ears!
 
Regards to all,
Jerry

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