Recent Earthquakes in California and Nevada


== PRELIMINARY EARTHQUAKE REPORT ==

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


Version #7: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro earthquake occurred at 1:03:07 AM (PDT) on Monday, April 5, 2021.
The magnitude 0.4 event occurred 30 km (18 miles) NW of Chester, CA.
The hypocentral depth is -2 km (-1 miles).


Magnitude 0.4 - duration magnitude (Md)
Time Monday, April 5, 2021 at 1:03:07 AM (PDT)
Monday, April 5, 2021 at 8:03:07 (UTC)
Distance from Chester, CA - 30 km (18 miles) NW (317 degrees)
Shingletown, CA - 36 km (22 miles) E (88 degrees)
Burney, CA - 45 km (28 miles) SSE (159 degrees)
Greenville, CA - 60 km (37 miles) NW (313 degrees)
Palo Cedro, CA - 65 km (41 miles) E (96 degrees)
Coordinates 40 deg. 30.1 min. N (40.502N), 121 deg. 28.1 min. W (121.469W)
Depth -2.08 km (-1.3 miles)
Quality Fair
Location Quality Parameters Nst=4, Nph=5, Dmin=4.1 km, Rmss=0.11 sec, Erho=1.19 km, Erzz=2.17 km, Gp=267 degrees
Event ID# nc73545690
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