PSN-L Email List Message

Subject: Cumulative Spectral Power example
From: Randall Peters PETERS_RD@..........
Date: Sat, 09 Feb 2008 10:34:21 -0500

In my previous submission I alluded to how the CSP allows one to readily observe
time dependent changes in the spectral content of the earth's motions.  Of course
earthquakes are among the most important of those, but it is incredible how little
attention is given to the details of their spectral nature.  There is great to-do
about the arrival times of P, S and surface waves; but it's as though folks only
want to know (i) how big, (ii) how deep, and (iii) where did it happen.  There is
SO MUCH more to be gleaned from the records, if the calculations were simply done.
On my webpage that was just generated at
 I show one example of the wealth of information that is available to us and which
is not yet being mined!
Why there has not been at least some attention given to more routine PSD
calculations is mind boggling.
      To those of you who would want to similarly calculate PSD/CSP curves from
data recorded with your own seismometer--by means of the LabView algorithm that Dr.
Lee produced (used to generate the figure in the above reference)--John has
indicated his willingness to provide the program free of charge to anyone who would
simply send him an email.  I don't know to what extent that code can be simply
packaged in a zip form for email attachment; it was in my case transferred to my
computer with a flash drive.

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