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

A micro quarry occurred at 4:21:01 PM (PDT) on Wednesday, May 16, 2018.
The magnitude 1.8 event (a probable quarry explosion) occurred 5 km (3 miles) NNW of Boron, CA.
The hypocentral depth is -1 km (-0.5 miles).



Magnitude 1.8 - local magnitude (Ml)
Time Wednesday, May 16, 2018 at 4:21:01 PM (PDT)
Wednesday, May 16, 2018 at 23:21:01 (UTC)
Distance from Boron, CA - 5 km (3 miles) NNW (346 degrees)
Edwards Air Force Base, CA - 29 km (18 miles) ENE (57 degrees)
California City, CA - 31 km (19 miles) ESE (107 degrees)
Johannesburg, CA - 36 km (23 miles) S (184 degrees)
Mojave, CA - 46 km (29 miles) E (91 degrees)
Coordinates 35 deg. 2.7 min. N (35.045N), 117 deg. 39.8 min. W (117.664W)
Depth -0.79 km (-0.5 miles)
Quality Fair
Location Quality Parameters Nst=20, Nph=20, Dmin=12.7 km, Rmss=0.12 sec, Erho=0.31 km, Erzz=31.61 km, Gp=54 degrees
Event ID# ci38174592
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