Can someone help explain how to read these first motion focal mechanism
diagram balls? I have always seen these but was not able to decipher them
too well.

http://quake.wr.usgs.gov/recenteqs/QuakeAddons/nc40237749.ncfm1.html





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Kareem J. Lanier
El Sobrante, California (N37.96 W122.32)
East Bay Area Region

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