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== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California

Version #3: This report supersedes any earlier reports of this event.
This event has been reviewed by a seismologist.

A strong earthquake occurred at 11:15:56 AM (PST) on Monday, December 22, 2003.
The magnitude 6.5 event occurred 11 km (7 miles) NE (49 degrees) of San Simeon, CA.
The hypocentral depth is 8 km ( 5 miles).


Magnitude 6.5 - (unknown type)
Time Monday, December 22, 2003 at 11:15:56 AM (PST)
Monday, December 22, 2003 at 19:15:56 (UTC)
Distance from San Simeon, CA - 11 km (7 miles) NE (49 degrees)
Cambria, CA - 16 km (10 miles) N (353 degrees)
Cayucos, CA - 35 km (22 miles) NNW (327 degrees)
Paso Robles, CA - 38 km (24 miles) WNW (283 degrees)
Coordinates 35 deg. 42.3 min. N (35.706N), 121 deg. 6.1 min. W (121.102W)
Depth 7.6 km (4.7 miles)
Quality Excellent
Location Quality Parameters Nst= 46, Nph= 46, Dmin=5.4 km, Rmss=0.05 sec, Erho=0.2 km, Erzz=0.8 km, Gp=82.8 degrees
Event ID# nc40148755
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Berkeley moment tensor solution
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NCSN First Motion Mechanism 1
ShakeMap shaking intensity maps (Northern California server)
Additional Waveforms

For more information, see http://quake.wr.usgs.gov/

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