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 0:23:57 AM (PDT) on Thursday, July 31, 2025.
The magnitude 0.8 event occurred 7 km (4 miles) E of Ontario, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 0.8 - local magnitude (Ml) |
| Time | Thursday, July 31, 2025 at 0:23:57 AM (PDT) Thursday, July 31, 2025 at 7:23:57 (UTC) |
| Distance from |
Ontario, CA - 7 km (4 miles) E (101 degrees) Mira Loma, CA - 7 km (4 miles) NW (325 degrees) Glen Avon, CA - 7 km (5 miles) WNW (296 degrees) Rancho Cucamonga, CA - 9 km (6 miles) SSE (167 degrees) Pedley, CA - 10 km (7 miles) NW (315 degrees) |
| Coordinates | 34 deg. 2.5 min. N (34.041N), 117 deg. 33.4 min. W (117.557W) |
| Depth | 9.92 km (6.20 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=27, Nph=46, Dmin=9.2 km, Rmss=0.14 sec, Erho=0.25 km, Erzz=0.39 km, Gp=79 degrees |
| Event ID# | ci41249184 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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