Recent Earthquakes in California and Nevada


== PRELIMINARY EVENT 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 quarry occurred at 11:07:05 AM (PDT) on Tuesday, September 14, 2021.
The magnitude 1.1 event (a probable quarry explosion) occurred 2 km (1 miles) SSW of Clayton, CA.
The hypocentral depth is -0.26 km (-0.2 miles).


Magnitude 1.1 - duration magnitude (Md)
Time Tuesday, September 14, 2021 at 11:07:05 AM (PDT)
Tuesday, September 14, 2021 at 18:07:05 (UTC)
Distance from Clayton, CA - 2 km (1 miles) SSW (213 degrees)
Concord, CA - 8 km (5 miles) SE (131 degrees)
Waldon, CA - 9 km (6 miles) E (92 degrees)
Walnut Creek, CA - 10 km (6 miles) E (79 degrees)
Pleasant Hill, CA - 10 km (6 miles) ESE (106 degrees)
Coordinates 37 deg. 55.4 min. N (37.923N), 121 deg. 57.0 min. W (121.951W)
Depth -0.26 km (-0.2 miles)
Quality Good
Location Quality Parameters Nst=11, Nph=11, Dmin=2.7 km, Rmss=0.07 sec, Erho=0.26 km, Erzz=31.61 km, Gp=76 degrees
Event ID# nc73624806
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