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== PRELIMINARY EARTHQUAKE REPORT ==
California Integrated Seismic Net
USGS/ Caltech/ CGS/ UCB/ UCSD/ UNR

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

A light earthquake occurred at 9:00:15 PM (PDT) on Friday, September 5, 2008.
The magnitude 4.0 event occurred 3 km (2 miles) ENE of Alamo, CA.
The hypocentral depth is 16 km (10 miles).


Magnitude 4.0 - regional moment magnitude (Mw)
Time Friday, September 5, 2008 at 9:00:15 PM (PDT)
Saturday, September 6, 2008 at 4:00:15 (UTC)
Distance from Alamo, CA - 3 km (2 miles) ENE (77 degrees)
Diablo, CA - 5 km (3 miles) NW (315 degrees)
Danville, CA - 6 km (4 miles) NNW (343 degrees)
Concord, CA - 11 km (7 miles) S (172 degrees)
Oakland, CA - 22 km (14 miles) ENE (69 degrees)
Coordinates 37 deg. 51.9 min. N (37.866N), 121 deg. 59.7 min. W (121.996W)
Depth 16.2 km (10.1 miles)
Location Quality Excellent
Location Quality Parameters Nst=250, Nph=250, Dmin=1 km, Rmss=0.14 sec, Erho=0.1 km, Erzz=0.2 km, Gp=46.8 degrees
Event ID# nc51207740
Additional Information 2-degree map
Google Earth KML (Requires Google Earth.)
ShakeMap shaking intensity maps
Did you feel it?
NCSN First Motion Mechanism 1
Waveforms
Waveforms for ShakeMap
Berkeley moment tensor solution
Tsunami Information Statement from the WC/ATWC

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

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