PSN-L Email List Message
Subject: Re: Question about expected performance
From: Larry Conklin lconklin@............
Date: Wed, 18 Oct 2006 16:40:17 -0400
I have been running a Shakelford-Gunderson sensor since mid 2000, and in
that time have collected a little over 500 events. I made up a couple
of Excel spreadsheets to keep track of them. The spreadsheets
automatically plot the events on a magnitude - distance scatter plot
along with a color coded (and very subjective) measure of "quality" of
the detection. At my location in central NY my plots show a lot of
detections from about Mag 5.5 and up at ranges of 3000 mi and greater.
Closer in than 3000 mi, I see a lot of stuff at lower magnitudes. I
think the noise performance of my set-up leaves a lot to be desired but
that otherwise, it seems to do about as well as people are reporting for
their Lehmans. I could send you copies of my data if you're interested.
I think this listserve strips off attachments, but I will send the
info directly to anyone who is curious.
> Q 2. What are the expectations of a Lehman sensor? I know that depends
> on many factors, and not the lease of which is the quality of the
> sensor, and its environment, as well as the type and location of the
> events. But just in general terms. The AS1, which is not a Lehman
> suggest one should be able to see 6.0m from several thousand mile away,
> or something like that.
> The reason I ask, I do hear statements, both over and under my
> expectations. Time will tell, but I wanted your opinions.
> Cheers, Ted
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