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 5:19:27 AM (PST) on Friday, November 21, 2025.
The magnitude 1.0 event occurred 4 km (3 miles) SE of Ontario, CA.
The hypocentral depth is 4 km ( 3 miles).
| Magnitude | 1.0 - local magnitude (Ml) |
| Time | Friday, November 21, 2025 at 5:19:27 AM (PST) Friday, November 21, 2025 at 13:19:27 (UTC) |
| Distance from |
Ontario, CA - 4 km (3 miles) SE (136 degrees) Mira Loma, CA - 8 km (5 miles) WNW (297 degrees) Chino, CA - 9 km (5 miles) E (79 degrees) Upland, CA - 9 km (6 miles) SSE (149 degrees) Montclair, CA - 10 km (6 miles) SE (124 degrees) |
| Coordinates | 34 deg. 1.6 min. N (34.026N), 117 deg. 35.8 min. W (117.597W) |
| Depth | 4.27 km (2.70 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=37, Nph=59, Dmin=4.0 km, Rmss=0.14 sec, Erho=0.17 km, Erzz=0.37 km, Gp=42 degrees |
| Event ID# | ci41125423 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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