Recent Earthquakes in California and Nevada


== PRELIMINARY EARTHQUAKE 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 earthquake occurred at 5:12:07 PM (PDT) on Tuesday, April 6, 2021.
The magnitude 0.9 event occurred 4 km (3 miles) NE (40 degrees) of Rancho Cucamonga, CA.
The hypocentral depth is 11 km ( 7 miles).


Magnitude 0.9 - local magnitude (Ml)
Time Tuesday, April 6, 2021 at 5:12:07 PM (PDT)
Wednesday, April 7, 2021 at 0:12:07 (UTC)
Distance from Rancho Cucamonga, CA - 4 km (3 miles) NE (40 degrees)
Fontana, CA - 10 km (6 miles) NW (307 degrees)
Upland, CA - 11 km (7 miles) NE (56 degrees)
Ontario, CA - 13 km (8 miles) NNE (33 degrees)
Lytle Creek, CA - 13 km (8 miles) SSW (201 degrees)
Coordinates 34 deg. 9.2 min. N (34.153N), 117 deg. 32.9 min. W (117.549W)
Depth 10.66 km (6.6 miles)
Quality Excellent
Location Quality Parameters Nst=22, Nph=42, Dmin=3.5 km, Rmss=0.09 sec, Erho=0.2 km, Erzz=0.24 km, Gp=87 degrees
Event ID# ci39841352
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