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 4:18:50 PM (PDT) on Tuesday, April 6, 2021.
The magnitude 2.0 event (a probable quarry explosion) occurred 6 km (3 miles) NW of Boron, CA.
The hypocentral depth is -1 km (-0.5 miles).


Magnitude 2.0 - local magnitude (Ml)
Time Tuesday, April 6, 2021 at 4:18:50 PM (PDT)
Tuesday, April 6, 2021 at 23:18:50 (UTC)
Distance from Boron, CA - 6 km (3 miles) NW (323 degrees)
Edwards Air Force Base, CA - 27 km (17 miles) NE (56 degrees)
California City, CA - 29 km (18 miles) ESE (109 degrees)
Johannesburg, CA - 37 km (23 miles) S (187 degrees)
Mojave, CA - 44 km (28 miles) E (92 degrees)
Coordinates 35 deg. 2.4 min. N (35.040N), 117 deg. 41.2 min. W (117.686W)
Depth -0.82 km (-0.5 miles)
Quality Fair
Location Quality Parameters Nst=31, Nph=32, Dmin=11.7 km, Rmss=0.2 sec, Erho=0.4 km, Erzz=31.61 km, Gp=51 degrees
Event ID# ci39841304
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