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 8:30:55 AM (PDT) on Monday, September 1, 2025.
The magnitude 1.0 event occurred 5 km (3 miles) SE of Ontario, CA.
The hypocentral depth is 5 km ( 3 miles).
| Magnitude | 1.0 - local magnitude (Ml) |
| Time | Monday, September 1, 2025 at 8:30:55 AM (PDT) Monday, September 1, 2025 at 15:30:55 (UTC) |
| Distance from |
Ontario, CA - 5 km (3 miles) SE (131 degrees) Mira Loma, CA - 7 km (5 miles) WNW (298 degrees) Chino, CA - 9 km (6 miles) E (82 degrees) Upland, CA - 10 km (6 miles) SE (145 degrees) Glen Avon, CA - 10 km (6 miles) W (278 degrees) |
| Coordinates | 34 deg. 1.4 min. N (34.023N), 117 deg. 35.2 min. W (117.587W) |
| Depth | 4.81 km (3.00 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=47, Nph=83, Dmin=3.1 km, Rmss=0.18 sec, Erho=0.17 km, Erzz=0.4 km, Gp=38 degrees |
| Event ID# | ci41280736 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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