PSN-L Email List Message
Subject: Re: Earthquake Wave Attenuation
From: Bob Hancock icarus@.........
Date: Wed, 9 Sep 2009 20:38:58 -0700
Hi Geoff -
There are programs called artificial seismogram programs. They are
normally run on UNIX based computers such as a MAC or in LINUX. They
are use by seismologists and geophysicists in studying the earth's
interior. You are correct in that they use generic earth models.
These models are constantly being revised and updated by seismologists
and geophysicists as they study the earth. These models are openly
shared in the scientific community. To learn more about them do a
google search for PREM EARTH MODELS. The word PREM is an acronym for
Primary Reference Earth Model.
On Sep 9, 2009, at 7:59 PM, Geoffrey wrote:
> It is my experience that with a SPZ located
> in a noisy area you should be able to have
> an MDL (minimum discernable level) for a
> regional quake of 4.0 Ml (richter) at a
> distance of 6 degrees great circle.
> Unless you are in a quiet area do not
> expect much better than this.
> Im not sure what math you use but this magnitude
> and distance can be translated from your own
> location to 180 degrees. Spreading losses
> and heat losses and reflection/refraction losses
> relating to the velocity changes across various boundaries.
> They (USGS) most likely have some kind of ideal math model of all this
> which may be a closely guarded secret so like
> you and I will never see the real thing to run in our
> Well probably only see the old stuff from like the 1950s.
> ----- Original Message ----- From: "Richard Webb" >
> To: "PSN-L Mailing List"
> Sent: Wednesday, September 09, 2009 9:33 AM
> Subject: Earthquake Wave Attenuation
>> I am interested in locating a paper which describes the
>> relationship between earthquake detectability, magnitude and
>> distance. Assumptions are a generalized earth model and
>> seismometers, with respect to sensitivity, available to "amateurs".
>> Richard Webb
>> Raleigh, NC
>> Farr and Webb Family Genealogy site: http://Genequake.com/Genealogy
>> Family and Seismology site: http://Genequake.com
>> Public Seismic Network Mailing List (PSN-L)
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