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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 #4: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro quarry occurred at 12:59:57 PM (PDT) on Thursday, May 21, 2020.
The magnitude 1.7 event (a probable quarry explosion) occurred 5 km (3 miles) ESE of Chula Vista, CA.
The hypocentral depth is -0.36 km (-0.2 miles).



Magnitude 1.7 - local magnitude (Ml)
Time Thursday, May 21, 2020 at 12:59:57 PM (PDT)
Thursday, May 21, 2020 at 19:59:57 (UTC)
Distance from Chula Vista, CA - 5 km (3 miles) ESE (123 degrees)
San Ysidro, CA - 7 km (4 miles) NE (35 degrees)
Bonita, CA - 7 km (4 miles) SSE (157 degrees)
Tijuana, B.C., MX - 8 km (5 miles) NNE (12 degrees)
Imperial Beach, CA - 11 km (7 miles) E (79 degrees)
Coordinates 32 deg. 36.1 min. N (32.602N), 117 deg. 0.1 min. W (117.002W)
Depth -0.36 km (-0.2 miles)
Quality Poor
Location Quality Parameters Nst=31, Nph=31, Dmin=6.8 km, Rmss=0.24 sec, Erho=1.17 km, Erzz=31.61 km, Gp=205 degrees
Event ID# ci39210303
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