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 #5: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 9:51:19 PM (PDT) on Monday, September 29, 2025.
The magnitude 1.1 event occurred 7 km (4 miles) N of Upland, CA.
The hypocentral depth is 11 km ( 7 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Monday, September 29, 2025 at 9:51:19 PM (PDT) Tuesday, September 30, 2025 at 4:51:19 (UTC) |
| Distance from |
Upland, CA - 7 km (4 miles) N (356 degrees) Rancho Cucamonga, CA - 8 km (5 miles) WNW (302 degrees) Claremont, CA - 9 km (6 miles) NE (40 degrees) Montclair, CA - 10 km (6 miles) NNE (19 degrees) La Verne, CA - 12 km (8 miles) ENE (57 degrees) |
| Coordinates | 34 deg. 9.7 min. N (34.162N), 117 deg. 39.2 min. W (117.654W) |
| Depth | 10.83 km (6.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=29, Nph=51, Dmin=4.8 km, Rmss=0.15 sec, Erho=0.22 km, Erzz=0.31 km, Gp=52 degrees |
| Event ID# | ci41100831 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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