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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 1:55:03 PM (PDT) on Tuesday, September 15, 2020.
The magnitude 1.4 event (a probable quarry explosion) occurred 6 km (4 miles) ESE of Bonita, CA.
The hypocentral depth is -0.36 km (-0.2 miles).



Magnitude 1.4 - local magnitude (Ml)
Time Tuesday, September 15, 2020 at 1:55:03 PM (PDT)
Tuesday, September 15, 2020 at 20:55:03 (UTC)
Distance from Bonita, CA - 6 km (4 miles) ESE (119 degrees)
Chula Vista, CA - 7 km (4 miles) E (86 degrees)
La Presa, CA - 9 km (5 miles) SSE (167 degrees)
San Ysidro, CA - 11 km (7 miles) NE (35 degrees)
Tijuana, B.C., MX - 12 km (8 miles) NNE (20 degrees)
Coordinates 32 deg. 38.0 min. N (32.633N), 116 deg. 58.5 min. W (116.976W)
Depth -0.36 km (-0.2 miles)
Quality Fair
Location Quality Parameters Nst=31, Nph=31, Dmin=5.1 km, Rmss=0.19 sec, Erho=0.55 km, Erzz=31.61 km, Gp=125 degrees
Event ID# ci38690522
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