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== PRELIMINARY EARTHQUAKE REPORT ==

U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California



Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro earthquake occurred at 11:46:01 AM (PDT) on Monday, May 6, 2013.
The magnitude 1.1 event occurred 20 km (12 miles) WNW of Portola, CA.
The hypocentral depth is 5 km ( 3 miles).



Magnitude 1.1 - duration magnitude (Md)
Time Monday, May 6, 2013 at 11:46:01 AM (PDT)
Monday, May 6, 2013 at 18:46:01 (UTC)
Distance from Portola, CA - 20 km (12 miles) WNW (290 degrees)
Quincy, CA - 23 km (15 miles) ESE (108 degrees)
Greenville, CA - 37 km (23 miles) SE (143 degrees)
Susanville, CA - 61 km (38 miles) S (183 degrees)
Coordinates 39 deg. 52.3 min. N (39.871N), 120 deg. 41.2 min. W (120.686W)
Depth 5.1 km (3.2 miles)
Quality Poor
Location Quality Parameters Nst= 10, Nph= 10, Dmin=11 km, Rmss=0.04 sec, Erho=0.6 km, Erzz=31.6 km, Gp=230.4 degrees
Event ID# nc71986661
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