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== PRELIMINARY EARTHQUAKE REPORT ==

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



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

A micro earthquake occurred at 5:15:45 AM (PDT) on Friday, October 16, 2020.
The magnitude 2.0 event occurred 8 km (5 miles) ESE of Challenge-Brownsville, CA.
The hypocentral depth is 11 km ( 7 miles).



Magnitude 2.0 - duration magnitude (Md)
Time Friday, October 16, 2020 at 5:15:45 AM (PDT)
Friday, October 16, 2020 at 12:15:45 (UTC)
Distance from Challenge-Brownsville, CA - 8 km (5 miles) ESE (118 degrees)
Lake Wildwood, CA - 22 km (14 miles) N (4 degrees)
Loma Rica, CA - 24 km (15 miles) NE (56 degrees)
Nevada City, CA - 24 km (15 miles) NW (323 degrees)
Oroville East, CA - 26 km (16 miles) ESE (109 degrees)
Coordinates 39 deg. 25.9 min. N (39.432N), 121 deg. 11.1 min. W (121.185W)
Depth 10.71 km (6.7 miles)
Quality Fair
Location Quality Parameters Nst=10, Nph=11, Dmin=26.2 km, Rmss=0.1 sec, Erho=0.72 km, Erzz=3.46 km, Gp=118 degrees
Event ID# nc73471446
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