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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 3:39:59 PM (PDT) on Monday, September 9, 2019.
The magnitude 1.2 event (a probable quarry explosion) occurred 5 km (3 miles) SE of Chula Vista, CA.
The hypocentral depth is -0.43 km (-0.3 miles).



Magnitude 1.2 - local magnitude (Ml)
Time Monday, September 9, 2019 at 3:39:59 PM (PDT)
Monday, September 9, 2019 at 22:39:59 (UTC)
Distance from Chula Vista, CA - 5 km (3 miles) SE (129 degrees)
San Ysidro, CA - 6 km (4 miles) NNE (30 degrees)
Bonita, CA - 7 km (4 miles) SSE (162 degrees)
Tijuana, B.C., MX - 8 km (5 miles) N (7 degrees)
Imperial Beach, CA - 10 km (6 miles) E (79 degrees)
Coordinates 32 deg. 36.1 min. N (32.602N), 117 deg. 0.5 min. W (117.009W)
Depth -0.43 km (-0.3 miles)
Quality Poor
Location Quality Parameters Nst=26, Nph=27, Dmin=7.4 km, Rmss=0.21 sec, Erho=1.1 km, Erzz=31.61 km, Gp=209 degrees
Event ID# ci38822695
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