You can find comments about focal mechanism / moment tensor / beach balls at
the following sites......

From the USGS

	http://www.geophys.washington.edu/recenteqs/beachball.html

From Dave Nelson's Site

	http://psn.quake.net/dave/fomec.htm


From Charles J. Ammon's Understand Earthquakes - Available through St. Lous
University at the following link - I just tried it and everything to St.
Louis Unveristy seem down right now.  This is a 14.2 M PDF file - Reference
pages 157-162.


http://www.eas.slu.edu/People/RBHerrmann/Courses/EASA130/IntroQuakes.Ammon.p
df


You can also access the course notes for the text book mentioned above from
Larry's site, at the following link

	http://www.eas.slu.edu/People/CJAmmon/HTML/Classes/IntroQuakes/

Under On-line Notes, go to Section III, Faults and Faulting





-----Original Message-----
From: psn-l-request@..............
[mailto:psn-l-request@................. Behalf Of Larry Conklin
Sent: Saturday, March 16, 2002 13:33
To: PSN List
Subject: Moment tensor solutions?


A lot of the quake reports issued by the NEIC include moment tensor
solutions.  Can anyone point me to a source that gives a basic description
of how these reports are interpreted?  How does one read the "beach balls"?

Larry Conklin
lconklin@............

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