Recent Earthquakes in California and Nevada


== 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 3:37:17 PM (PDT) on Thursday, April 29, 2021.
The magnitude 0.8 event (a probable quarry explosion) occurred 9 km (5 miles) ESE of Fallbrook, CA.
The hypocentral depth is -1 km (-0.4 miles).


Magnitude 0.8 - local magnitude (Ml)
Time Thursday, April 29, 2021 at 3:37:17 PM (PDT)
Thursday, April 29, 2021 at 22:37:17 (UTC)
Distance from Fallbrook, CA - 9 km (5 miles) ESE (114 degrees)
Pala, CA - 9 km (5 miles) WSW (254 degrees)
Camp Pendleton North, CA - 14 km (9 miles) ENE (77 degrees)
Temecula, CA - 17 km (10 miles) S (186 degrees)
Vista, CA - 18 km (11 miles) NNE (24 degrees)
Coordinates 33 deg. 20.6 min. N (33.344N), 117 deg. 9.9 min. W (117.166W)
Depth -0.62 km (-0.4 miles)
Quality Fair
Location Quality Parameters Nst=12, Nph=12, Dmin=6.0 km, Rmss=0.22 sec, Erho=0.83 km, Erzz=31.61 km, Gp=135 degrees
Event ID# ci37473581
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