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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 2:01:49 PM (PST) on Wednesday, February 14, 2018.
The magnitude 1.0 event (a probable quarry explosion) occurred 7 km (4 miles) ESE of Bonita, CA.
The hypocentral depth is -0.36 km (-0.2 miles).



Magnitude 1.0 - local magnitude (Ml)
Time Wednesday, February 14, 2018 at 2:01:49 PM (PST)
Wednesday, February 14, 2018 at 22:01:49 (UTC)
Distance from Bonita, CA - 7 km (4 miles) ESE (109 degrees)
Chula Vista, CA - 9 km (5 miles) E (83 degrees)
La Presa, CA - 9 km (5 miles) SSE (155 degrees)
Jamul, CA - 12 km (7 miles) SW (221 degrees)
San Ysidro, CA - 12 km (8 miles) NE (40 degrees)
Coordinates 32 deg. 38.2 min. N (32.637N), 116 deg. 57.5 min. W (116.958W)
Depth -0.36 km (-0.2 miles)
Quality Poor
Location Quality Parameters Nst=20, Nph=22, Dmin=4.2 km, Rmss=0.2 sec, Erho=0.64 km, Erzz=31.61 km, Gp=190 degrees
Event ID# ci38108872
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