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

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

A microearthquake occurred at 11:04:12 PM (PDT) on Thursday, April 30, 2009.
The magnitude 0.5 event occurred 13 km (8 miles) SE of Anza, CA.
The hypocentral depth is 12 km ( 7 miles).


Magnitude 0.5 - local magnitude (ML)
Time Thursday, April 30, 2009 at 11:04:12 PM (PDT)
Friday, May 1, 2009 at 6:04:12 (UTC)
Distance from Anza, CA - 13 km (8 miles) SE (140 degrees)
Palomar Observatory, CA - 29 km (18 miles) ENE (65 degrees)
Lake Henshaw, CA - 30 km (19 miles) NNE (33 degrees)
Palm Springs, CA - 40 km (25 miles) S (187 degrees)
San Diego, CA - 93 km (58 miles) NE (34 degrees)
Coordinates 33 deg. 27.9 min. N (33.465N), 116 deg. 34.9 min. W (116.582W)
Depth 11.6 km (7.2 miles)
Location Quality Good
Location Quality Parameters Nst= 38, Nph= 38, Dmin=4 km, Rmss=0.13 sec, Erho=0.3 km, Erzz=0.6 km, Gp=100.8 degrees
Event ID# ci10403321
Additional Information map with fault names
Google Earth KML (Requires Google Earth.)

Did you feel it? || Shake Map South
For more information, see http://earthquake.usgs.gov/regional/sca/ || Contacts

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