Hi Thomas,

The sense (polarity) of motion of the phases recorded at a seismic 
station can be used,
when combined with many other stations, to determine the focal 
mechanism of the
earthquake.  Here's a web site where an explanation is attempted.
http://quake.usgs.gov/recenteqs/beachball.html

Cheers,
John

At 12:29 PM 1/27/2008, Thomas Dick wrote:
>will the "p" wave created by movement along a strike-slip fault be 
>distinct from other types?


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