PSN-L Email List Message

Subject: Re: How much movement
From: Bob Hancock carpediem1@.........
Date: Tue, 30 Dec 2008 23:12:41 -0700

Steiner -

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.

Bob Hancock

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  
> centimeters
> 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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