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== PRELIMINARY EARTHQUAKE REPORT ==

Southern California Seismic Network: a cooperative project of
U.S. Geological Survey, Pasadena California
Caltech Seismological Laboratory, Pasadena, California



Version #6: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.

A micro earthquake occurred at 9:36:47 PM (PDT) on Tuesday, October 8, 2019.
The magnitude 1.0 event occurred 3 km (2 miles) ESE of Colton, CA.
The hypocentral depth is 15 km ( 9 miles).



Magnitude 1.0 - local magnitude (Ml)
Time Tuesday, October 8, 2019 at 9:36:47 PM (PDT)
Wednesday, October 9, 2019 at 4:36:47 (UTC)
Distance from Colton, CA - 3 km (2 miles) ESE (109 degrees)
Loma Linda, CA - 3 km (2 miles) NW (312 degrees)
Grand Terrace, CA - 4 km (3 miles) NE (38 degrees)
San Bernardino, CA - 7 km (4 miles) S (173 degrees)
Rialto, CA - 9 km (6 miles) ESE (120 degrees)
Coordinates 34 deg. 3.9 min. N (34.065N), 117 deg. 17.0 min. W (117.284W)
Depth 15.16 km (9.4 miles)
Quality Excellent
Location Quality Parameters Nst=47, Nph=77, Dmin=11.0 km, Rmss=0.14 sec, Erho=0.19 km, Erzz=0.29 km, Gp=56 degrees
Event ID# ci39121048
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