== 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 10:48:49 PM (PDT) on Monday, May 4, 2009.
The magnitude 0.5 event occurred 3 km (2 miles) ESE of The Geysers, CA.
The hypocentral depth is 4 km ( 2 miles).


Magnitude 0.5 - duration magnitude (Md)
Time Monday, May 4, 2009 at 10:48:49 PM (PDT)
Tuesday, May 5, 2009 at 5:48:49 (UTC)
Distance from The Geysers, CA - 3 km (2 miles) ESE (106 degrees)
Cobb, CA - 7 km (4 miles) SW (220 degrees)
Anderson Springs, CA - 7 km (4 miles) WNW (284 degrees)
Santa Rosa, CA - 38 km (24 miles) N (351 degrees)
Sacramento, CA - 116 km (72 miles) WNW (283 degrees)
Coordinates 38 deg. 47.4 min. N (38.790N), 122 deg. 46.2 min. W (122.770W)
Depth 3.7 km (2.3 miles)
Location Quality Excellent
Location Quality Parameters Nst= 8, Nph= 8, Dmin=2 km, Rmss=0.02 sec, Erho=0.8 km, Erzz=0.6 km, Gp=82.8 degrees
Event ID# nc51221043
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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