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 #7: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A minor earthquake occurred at 9:36:50 AM (PDT) on Thursday, July 31, 2025.
The magnitude 3.1 event occurred 5 km (3 miles) NW of Rialto, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 3.1 - local magnitude (Ml) |
| Time | Thursday, July 31, 2025 at 9:36:50 AM (PDT) Thursday, July 31, 2025 at 16:36:50 (UTC) |
| Distance from |
Rialto, CA - 5 km (3 miles) NW (317 degrees) Muscoy, CA - 6 km (4 miles) WSW (258 degrees) Fontana, CA - 7 km (4 miles) NE (42 degrees) Bloomington, CA - 8 km (5 miles) N (351 degrees) Devore, CA - 9 km (6 miles) S (185 degrees) |
| Coordinates | 34 deg. 8.5 min. N (34.142N), 117 deg. 24.6 min. W (117.410W) |
| Depth | 5.76 km (3.60 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=143, Nph=264, Dmin=5.4 km, Rmss=0.22 sec, Erho=0.11 km, Erzz=0.38 km, Gp=20 degrees |
| Event ID# | ci41249512 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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