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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 1:53:52 PM (PDT) on Thursday, July 12, 2018.
The magnitude 1.3 event (a probable quarry explosion) occurred 2 km (1 miles) ENE (57 degrees) of San Ysidro, CA.
The hypocentral depth is -0.36 km (-0.2 miles).



Magnitude 1.3 - local magnitude (Ml)
Time Thursday, July 12, 2018 at 1:53:52 PM (PDT)
Thursday, July 12, 2018 at 20:53:52 (UTC)
Distance from San Ysidro, CA - 2 km (1 miles) ENE (57 degrees)
Tijuana, B.C., MX - 3 km (2 miles) N (349 degrees)
Imperial Beach, CA - 8 km (5 miles) ESE (108 degrees)
Chula Vista, CA - 8 km (5 miles) SSE (165 degrees)
Bonita, CA - 11 km (7 miles) S (179 degrees)
Coordinates 32 deg. 33.6 min. N (32.561N), 117 deg. 1.6 min. W (117.027W)
Depth -0.36 km (-0.2 miles)
Quality Poor
Location Quality Parameters Nst=27, Nph=27, Dmin=10.5 km, Rmss=0.26 sec, Erho=1.78 km, Erzz=31.61 km, Gp=226 degrees
Event ID# ci38220032
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