PSN-L Email List Message

Subject: Re: WinQuake
From: ted@..........
Date: Fri, 19 Nov 1999 07:35:41 -0500




Jim,

The period of the instrument is a kind of meta-data, similar to the
location of the instrument, the maximum and minimum possible digital values
for an instrument, etc.  I had not left a lot of room for this stuff, but
when Larry got interested we moved fields around in the PSN file header to
make room for lots more meta-data.  (Thus the "old" and "new" file
formats.)  However we did not define a field to store the period of the
sensor.  Theoretically, the three-character ID of the sensor should map to
a particular set of characteristics, one of which would be period, but
that's probably cutting it a bit fine for a basement operation.

We already compute sampling rate directly from the data by knowing start
and stop times, and the number of samples, so there's no need to store it
in the header.  I wonder - is it possible to figure out the fundamental
period of a sensor from the recording of some interval of time when it was
being energized by seismic waves?  If so, then the period is already
encoded in every data file, and it's just SMOP to get it out.  (SMOP =
Small Matter Of Programming.  Term typically used by management,
particularly Dilbert-type management.)

Regards, Ted


RADIOTEL@....... on 11/18/99 08:04:31 PM

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To:   psn-l@..............
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Subject:  Re: WinQuake



In the program WinQuake, is the component labeled "Diff" on the last line
when you print out earthquake results the area that indicates the period of
the instrument?  If so are there variables that change the period from one
quake to another?
Jim Allen

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Larry Cochrane <cochrane@..............>