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 #4: This report supersedes any earlier reports of this event. This is a computer-generated message. This event has not yet been reviewed by a seismologist.
A micro earthquake occurred at 7:38:01 PM (PDT) on Thursday, September 11, 2025.
The magnitude 1.0 event occurred 5 km (3 miles) NNE (12 degrees) of Rancho Cucamonga, CA.
The hypocentral depth is 11 km ( 7 miles).
| Magnitude | 1.0 - local magnitude (Ml) |
| Time | Thursday, September 11, 2025 at 7:38:01 PM (PDT) Friday, September 12, 2025 at 2:38:01 (UTC) |
| Distance from |
Rancho Cucamonga, CA - 5 km (3 miles) NNE (12 degrees) Upland, CA - 10 km (6 miles) NE (45 degrees) Lytle Creek, CA - 12 km (8 miles) SSW (211 degrees) Fontana, CA - 13 km (8 miles) NW (306 degrees) Ontario, CA - 14 km (8 miles) NNE (24 degrees) |
| Coordinates | 34 deg. 9.9 min. N (34.164N), 117 deg. 34.1 min. W (117.569W) |
| Depth | 10.76 km (6.70 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=36, Nph=61, Dmin=8.0 km, Rmss=0.14 sec, Erho=0.17 km, Erzz=0.23 km, Gp=45 degrees |
| Event ID# | ci41289576 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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