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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 1:55:09 PM (PDT) on Wednesday, July 11, 2018.
The magnitude 1.4 event (a probable quarry explosion) occurred 6 km (4 miles) NE (41 degrees) of San Ysidro, CA.
The hypocentral depth is -0.36 km (-0.2 miles).



Magnitude 1.4 - local magnitude (Ml)
Time Wednesday, July 11, 2018 at 1:55:09 PM (PDT)
Wednesday, July 11, 2018 at 20:55:09 (UTC)
Distance from San Ysidro, CA - 6 km (4 miles) NE (41 degrees)
Chula Vista, CA - 6 km (4 miles) SE (129 degrees)
Tijuana, B.C., MX - 7 km (5 miles) NNE (15 degrees)
Bonita, CA - 8 km (5 miles) SSE (158 degrees)
Imperial Beach, CA - 11 km (7 miles) E (84 degrees)
Coordinates 32 deg. 35.6 min. N (32.594N), 116 deg. 60.0 min. W (116.999W)
Depth -0.36 km (-0.2 miles)
Quality Poor
Location Quality Parameters Nst=30, Nph=31, Dmin=6.7 km, Rmss=0.25 sec, Erho=0.99 km, Erzz=31.61 km, Gp=206 degrees
Event ID# ci38219024
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