PSN-L Email List Message

Subject: Re: LP filters, A/D bits and SPS
From: barry lotz gbl@.......
Date: Fri, 12 Jan 2001 06:17:09 -0800

Hi Dave
    Sean Thomas had an email awhile back which included an equation for
calculating signal amplitude for various magnitude quakes and distances. I
believe 16 bit is not unreasonable . Example:  at the sensitivity of my
                  magnitude          distance           count
                       3.0                   250k             150
                       5.2                   250k           32768
                       5.5                 9000k              150
                       7.7                 9000k           32768
            winter microseism's      na                   300
These are approximate values I picked off a log-log graph I plotted. STM had a
more extensive table.  It is interesting to plot STM's equation and then plot
p-p magnitudes that one obtains from ones recorded events. I plotted log
distance on the x-axis and log count on the y-axis. Magnitude lines were then
plotted in 0.5 intervals.


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