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 #7: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 4:06:11 AM (PDT) on Thursday, August 28, 2025.
The magnitude 1.9 event occurred 5 km (3 miles) ENE (66 degrees) of Rancho Cucamonga, CA.
The hypocentral depth is 13 km ( 8 miles).
| Magnitude | 1.9 - local magnitude (Ml) |
| Time | Thursday, August 28, 2025 at 4:06:11 AM (PDT) Thursday, August 28, 2025 at 11:06:11 (UTC) |
| Distance from |
Rancho Cucamonga, CA - 5 km (3 miles) ENE (66 degrees) Fontana, CA - 8 km (5 miles) NW (306 degrees) Upland, CA - 12 km (7 miles) ENE (66 degrees) Ontario, CA - 13 km (8 miles) NE (42 degrees) Lytle Creek, CA - 13 km (8 miles) SSW (192 degrees) |
| Coordinates | 34 deg. 8.5 min. N (34.141N), 117 deg. 31.8 min. W (117.531W) |
| Depth | 13.09 km (8.10 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=102, Nph=170, Dmin=2.2 km, Rmss=0.17 sec, Erho=0.12 km, Erzz=0.24 km, Gp=21 degrees |
| Event ID# | ci41277296 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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