Recent Earthquakes in California and Nevada


== PRELIMINARY EARTHQUAKE REPORT ==

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


Version #0: 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 micro earthquake occurred at 3:40:24 AM (PDT) on Tuesday, July 20, 2021.
The magnitude 1.3 event occurred 4 km (2 miles) SE of Hercules, CA.
The hypocentral depth is 9 km ( 6 miles).


Magnitude 1.3 - duration magnitude (Md)
Time Tuesday, July 20, 2021 at 3:40:24 AM (PDT)
Tuesday, July 20, 2021 at 10:40:24 (UTC)
Distance from Hercules, CA - 4 km (2 miles) SE (128 degrees)
El Sobrante, CA - 4 km (3 miles) ENE (62 degrees)
Pinole, CA - 4 km (3 miles) ESE (105 degrees)
Rodeo, CA - 4 km (3 miles) SSE (164 degrees)
Tara Hills, CA - 6 km (3 miles) E (88 degrees)
Coordinates 37 deg. 59.7 min. N (37.995N), 122 deg. 15.2 min. W (122.253W)
Depth 9.27 km (5.8 miles)
Quality Excellent
Location Quality Parameters Nst=19, Nph=19, Dmin=3.3 km, Rmss=0.05 sec, Erho=0.24 km, Erzz=0.76 km, Gp=69 degrees
Event ID# nc73596021
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