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

Version #1: This report supersedes any earlier reports of this event.
This is a computer-generated message. This event has not yet been reviewed by a seismologist.

A microearthquake occurred at 8:45:52 PM (PDT) on Tuesday, May 5, 2009.
The magnitude 0.5 event occurred 7 km (4 miles) NW of The Geysers, CA.
The hypocentral depth is 2 km ( 1 mile).


Magnitude 0.5 - duration magnitude (Md)
Time Tuesday, May 5, 2009 at 8:45:52 PM (PDT)
Wednesday, May 6, 2009 at 3:45:52 (UTC)
Distance from The Geysers, CA - 7 km (4 miles) NW (314 degrees)
Cobb, CA - 12 km (7 miles) W (272 degrees)
Cloverdale, CA - 14 km (9 miles) ENE (71 degrees)
Santa Rosa, CA - 46 km (28 miles) NNW (343 degrees)
San Francisco City Hall, CA - 125 km (77 miles) NNW (342 degrees)
Coordinates 38 deg. 50.4 min. N (38.840N), 122 deg. 51.7 min. W (122.861W)
Depth 2.3 km (1.4 miles)
Location Quality Fair
Location Quality Parameters Nst= 8, Nph= 8, Dmin=1 km, Rmss=0.02 sec, Erho=1.5 km, Erzz=0.7 km, Gp=205.2 degrees
Event ID# nc51221097
Additional Information map with fault names
Google Earth KML (Requires Google Earth.)
Waveforms

Did you feel it? || Shake Map North
For more information, see http://quake.wr.usgs.gov/ || Contacts

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