PSN-L Email List Message
Subject: Re: How much movement
From: Bob Hancock carpediem1@.........
Date: Tue, 30 Dec 2008 23:12:41 -0700
One more comment on the subject of seismic wave amplitudes. The USGS
has a program that gives arrival times of both body and surface
waves. In the header is information on the expected 20 second period
surface wave amplitude, and expected 1 second period body wave
amplitude. The data is listed in both velocity and displacement
format. Here is the link to the program:
The same basic program is available for recent events within the past
14 days. Following is the link to that program:
I hope this helps.
On Dec 30, 2008, at 1:34 PM, Steinar Midtskogen wrote:
> I wonder, how big are the movements produced by distant quakes? Since
> only the waves with very long periods are detectable, the shaking is
> of course impossible to feel since even movements of several
> would be difficult to feel if the period is around 20 seconds.
> So, if my seismometer picks up a 6.0 quake 15.000 km away, what kind
> of movement are we talking about?
> Steinar Midtskogen
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