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== PRELIMINARY EVENT REPORT ==

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



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

A micro quarry occurred at 4:28:11 PM (PDT) on Tuesday, August 13, 2019.
The magnitude 1.2 event (a probable quarry explosion) occurred 6 km (3 miles) NNW of Boron, CA.
The hypocentral depth is -1 km (-0.5 miles).



Magnitude 1.2 - local magnitude (Ml)
Time Tuesday, August 13, 2019 at 4:28:11 PM (PDT)
Tuesday, August 13, 2019 at 23:28:11 (UTC)
Distance from Boron, CA - 6 km (3 miles) NNW (332 degrees)
Edwards Air Force Base, CA - 28 km (17 miles) NE (56 degrees)
California City, CA - 29 km (18 miles) ESE (108 degrees)
Johannesburg, CA - 37 km (23 miles) S (186 degrees)
Mojave, CA - 45 km (28 miles) E (91 degrees)
Coordinates 35 deg. 2.6 min. N (35.043N), 117 deg. 40.7 min. W (117.678W)
Depth -0.82 km (-0.5 miles)
Quality Fair
Location Quality Parameters Nst=25, Nph=25, Dmin=12.2 km, Rmss=0.21 sec, Erho=0.48 km, Erzz=31.61 km, Gp=78 degrees
Event ID# ci38965232
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