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 micro earthquake occurred at 10:37:21 PM (PDT) on Tuesday, October 21, 2025.
The magnitude 1.0 event occurred 6 km (4 miles) SSW of Lytle Creek, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 1.0 - local magnitude (Ml) |
| Time | Tuesday, October 21, 2025 at 10:37:21 PM (PDT) Wednesday, October 22, 2025 at 5:37:21 (UTC) |
| Distance from |
Lytle Creek, CA - 6 km (4 miles) SSW (202 degrees) Rancho Cucamonga, CA - 11 km (7 miles) NNE (28 degrees) Devore, CA - 11 km (7 miles) W (262 degrees) Fontana, CA - 14 km (8 miles) NNW (334 degrees) Upland, CA - 17 km (10 miles) NE (43 degrees) |
| Coordinates | 34 deg. 12.5 min. N (34.208N), 117 deg. 31.5 min. W (117.524W) |
| Depth | 5.76 km (3.60 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=15, Nph=22, Dmin=2.3 km, Rmss=0.12 sec, Erho=0.23 km, Erzz=0.46 km, Gp=126 degrees |
| Event ID# | ci41112567 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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