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 event has been reviewed by a seismologist.
A micro earthquake occurred at 2:38:35 AM (PST) on Tuesday, November 18, 2025.
The magnitude 1.1 event occurred 6 km (4 miles) NNW of Rancho Cucamonga, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Tuesday, November 18, 2025 at 2:38:35 AM (PST) Tuesday, November 18, 2025 at 10:38:35 (UTC) |
| Distance from |
Rancho Cucamonga, CA - 6 km (4 miles) NNW (329 degrees) Upland, CA - 9 km (5 miles) NNE (22 degrees) Ontario, CA - 13 km (8 miles) N (6 degrees) Montclair, CA - 13 km (8 miles) NE (34 degrees) Claremont, CA - 13 km (8 miles) NE (50 degrees) |
| Coordinates | 34 deg. 10.2 min. N (34.170N), 117 deg. 36.8 min. W (117.614W) |
| Depth | 10.45 km (6.50 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=43, Nph=68, Dmin=6.0 km, Rmss=0.16 sec, Erho=0.18 km, Erzz=0.27 km, Gp=47 degrees |
| Event ID# | ci41123383 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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