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

A micro quarry occurred at 11:53:18 AM (PDT) on Wednesday, July 11, 2018.
The magnitude 1.1 event (a probable quarry explosion) occurred 4 km (3 miles) NNW of Boron, CA.
The hypocentral depth is -1 km (-0.5 miles).



Magnitude 1.1 - local magnitude (Ml)
Time Wednesday, July 11, 2018 at 11:53:18 AM (PDT)
Wednesday, July 11, 2018 at 18:53:18 (UTC)
Distance from Boron, CA - 4 km (3 miles) NNW (328 degrees)
Edwards Air Force Base, CA - 27 km (17 miles) ENE (59 degrees)
California City, CA - 30 km (19 miles) ESE (110 degrees)
Johannesburg, CA - 38 km (24 miles) S (185 degrees)
Mojave, CA - 46 km (28 miles) E (93 degrees)
Coordinates 35 deg. 1.9 min. N (35.032N), 117 deg. 40.5 min. W (117.674W)
Depth -0.84 km (-0.5 miles)
Quality Fair
Location Quality Parameters Nst=11, Nph=11, Dmin=11.0 km, Rmss=0.09 sec, Erho=0.38 km, Erzz=31.61 km, Gp=135 degrees
Event ID# ci38218936
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