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:

http://neic.usgs.gov/neis/travel_times/compute_tt.html

The same basic program is available for recent events within the past  
14 days.  Following is the link to that program:

http://neic.usgs.gov/neis/travel_times/artim.html

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
> http://voksenlia.net/
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)