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

A micro earthquake occurred at 4:38:06 PM (PDT) on Thursday, July 24, 2025.
The magnitude 0.8 event occurred 11 km (7 miles) NNW of Upland, CA.
The hypocentral depth is 5 km ( 3 miles).


Magnitude 0.8 - local magnitude (Ml)
Time Thursday, July 24, 2025 at 4:38:06 PM (PDT)
Thursday, July 24, 2025 at 23:38:06 (UTC)
Distance from Upland, CA - 11 km (7 miles) NNW (344 degrees)
Claremont, CA - 12 km (7 miles) NNE (17 degrees)
Rancho Cucamonga, CA - 12 km (8 miles) NW (310 degrees)
Montclair, CA - 13 km (8 miles) N (3 degrees)
La Verne, CA - 13 km (8 miles) NE (37 degrees)
Coordinates 34 deg. 11.7 min. N (34.196N), 117 deg. 41.0 min. W (117.683W)
Depth 5.27 km (3.30 miles)
Quality Excellent
Location Quality Parameters Nst=18, Nph=31, Dmin=1.9 km, Rmss=0.12 sec, Erho=0.22 km, Erzz=0.26 km, Gp=67 degrees
Event ID# ci41031583
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