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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 12:30:34 PM (PDT) on Tuesday, July 10, 2018.
The magnitude 1.4 event (a probable quarry explosion) occurred 5 km (3 miles) SE of Bostonia, CA.
The hypocentral depth is -0.27 km (-0.2 miles).



Magnitude 1.4 - local magnitude (Ml)
Time Tuesday, July 10, 2018 at 12:30:34 PM (PDT)
Tuesday, July 10, 2018 at 19:30:34 (UTC)
Distance from Bostonia, CA - 5 km (3 miles) SE (125 degrees)
Rancho San Diego, CA - 6 km (3 miles) NE (51 degrees)
El Cajon, CA - 7 km (4 miles) ESE (104 degrees)
Jamul, CA - 7 km (4 miles) N (350 degrees)
Winter Gardens, CA - 7 km (4 miles) SE (144 degrees)
Coordinates 32 deg. 46.8 min. N (32.779N), 116 deg. 53.3 min. W (116.888W)
Depth -0.27 km (-0.2 miles)
Quality Fair
Location Quality Parameters Nst=26, Nph=32, Dmin=7.0 km, Rmss=0.23 sec, Erho=0.35 km, Erzz=31.61 km, Gp=60 degrees
Event ID# ci38217952
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