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 #3: 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 8:23:59 PM (PST) on Tuesday, December 30, 2025.
The magnitude 1.2 event occurred 7 km (5 miles) N of Upland, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 1.2 - local magnitude (Ml) |
| Time | Tuesday, December 30, 2025 at 8:23:59 PM (PST) Wednesday, December 31, 2025 at 4:23:59 (UTC) |
| Distance from |
Upland, CA - 7 km (5 miles) N (359 degrees) Rancho Cucamonga, CA - 8 km (5 miles) NW (305 degrees) Claremont, CA - 10 km (6 miles) NE (41 degrees) Montclair, CA - 10 km (6 miles) NNE (21 degrees) Ontario, CA - 12 km (8 miles) N (351 degrees) |
| Coordinates | 34 deg. 9.8 min. N (34.163N), 117 deg. 39.0 min. W (117.649W) |
| Depth | 9.52 km (5.90 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=48, Nph=79, Dmin=4.8 km, Rmss=0.18 sec, Erho=0.21 km, Erzz=0.35 km, Gp=56 degrees |
| Event ID# | ci41149911 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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