Recent Earthquakes in California and Nevada


== PRELIMINARY EVENT REPORT ==

Southern California Seismic Network: a cooperative project of
U.S. Geological Survey, Pasadena California
Caltech Seismological Laboratory, Pasadena, California


Version #5: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro quarry occurred at 9:36:48 AM (PDT) on Monday, September 13, 2021.
The magnitude 1.1 event (a probable quarry explosion) occurred 9 km (6 miles) NNW of Big Bear City, CA.
The hypocentral depth is -1 km (-1 miles).


Magnitude 1.1 - local magnitude (Ml)
Time Monday, September 13, 2021 at 9:36:48 AM (PDT)
Monday, September 13, 2021 at 16:36:48 (UTC)
Distance from Big Bear City, CA - 9 km (6 miles) NNW (339 degrees)
Big Bear Lake, CA - 11 km (7 miles) NNE (15 degrees)
Lucerne Valley, CA - 14 km (9 miles) SE (145 degrees)
Running Springs, CA - 26 km (16 miles) NE (55 degrees)
Lake Arrowhead, CA - 30 km (19 miles) ENE (70 degrees)
Coordinates 34 deg. 20.4 min. N (34.340N), 116 deg. 52.8 min. W (116.881W)
Depth -1.41 km (-0.9 miles)
Quality Good
Location Quality Parameters Nst=28, Nph=28, Dmin=5.0 km, Rmss=0.17 sec, Erho=0.32 km, Erzz=31.61 km, Gp=60 degrees
Event ID# ci39807223
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