PSN-L Email List Message

Subject: Fw: mb - Ms disciminant
From: "Larry Cochrane" cochrane@..............
Date: Mon, 27 Nov 2000 17:52:29 -0800


Sorry, I can't help you. I'm sending this message to the Public Seismic
Network mailing list. Maybe someone on the list can help.

PSN'ers, if you can help please CC the list and send your message directly
to Richard since he is not on the list.

-Larry Cochrane
Redwood City, PSN

----- Original Message -----
From: "Richard J. Warburton" 
Sent: Friday, November 24, 2000 2:43 PM
Subject: mb - Ms disciminant

> Dear Larry,
> I manufacture a very stable gravity meter (the 'Superconducting
> Gravimeter'), which is very low noise up to about 1 mHz.  Until
> recently, I have not been much interested in higher frequencies, since
> the range of frequencies from 1 mHz to 10 Hz seemed well covered by
> other long period seismometers.  Now, I believe that I might be able to
> improve the 'SG' so that it could improve measurements in the 1 to 20
> mHz range.
> My knowledge of seismology is limited, but I know that the measurement
> of mb-Ms is an important discriminant for separating underground
> explosions from earthquakes.  However, I have not yet found a simple and
> clear explanation of how either mb or Ms is measured.  What would be
> most helpful would to find the exact definition of mb and Ms, and then
> as an example show the incoming seismic wave train, the spectrum of the
> wave train, and an illustration of the calculation of these two.
> Advanced mathematics is okay as long as the result is "clarified" with
> some examples.
> Is this available is any book or paper that you are aware of?
> Thanks much,
> Richard
> --
> Richard Warburton
> GWR Instruments, Inc.
> 6264 Ferris Square, Suite D
> San Diego, California 92121
> phone: (858) 452-7655
> fax: (858) 452-6965


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