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 5:42:20 PM (PDT) on Thursday, September 18, 2025.
The magnitude 1.1 event occurred 7 km (4 miles) N (2 degrees) of Upland, CA.
The hypocentral depth is 11 km ( 7 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Thursday, September 18, 2025 at 5:42:20 PM (PDT) Friday, September 19, 2025 at 0:42:20 (UTC) |
| Distance from |
Upland, CA - 7 km (4 miles) N (2 degrees) Rancho Cucamonga, CA - 7 km (5 miles) NW (304 degrees) Claremont, CA - 10 km (6 miles) NE (44 degrees) Montclair, CA - 10 km (6 miles) NNE (23 degrees) Ontario, CA - 12 km (8 miles) N (352 degrees) |
| Coordinates | 34 deg. 9.6 min. N (34.160N), 117 deg. 38.8 min. W (117.646W) |
| Depth | 11.13 km (6.90 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=21, Nph=37, Dmin=7.1 km, Rmss=0.13 sec, Erho=0.25 km, Erzz=0.42 km, Gp=65 degrees |
| Event ID# | ci40445346 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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