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 1:00:20 AM (PDT) on Monday, August 4, 2025.
The magnitude 0.8 event occurred 6 km (4 miles) NW of Rialto, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 0.8 - local magnitude (Ml) |
| Time | Monday, August 4, 2025 at 1:00:20 AM (PDT) Monday, August 4, 2025 at 8:00:20 (UTC) |
| Distance from |
Rialto, CA - 6 km (4 miles) NW (317 degrees) Fontana, CA - 7 km (4 miles) NE (37 degrees) Muscoy, CA - 7 km (4 miles) W (261 degrees) Bloomington, CA - 8 km (5 miles) NNW (348 degrees) Devore, CA - 9 km (5 miles) S (188 degrees) |
| Coordinates | 34 deg. 8.7 min. N (34.145N), 117 deg. 24.9 min. W (117.415W) |
| Depth | 6.94 km (4.30 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=45, Nph=75, Dmin=5.4 km, Rmss=0.16 sec, Erho=0.2 km, Erzz=0.35 km, Gp=45 degrees |
| Event ID# | ci41252512 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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