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 #10: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 9:48:32 PM (PDT) on Thursday, March 27, 2025.
The magnitude 1.1 event occurred 2 km (1 miles) NE (55 degrees) of Upland, CA.
The hypocentral depth is 13 km ( 8 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Thursday, March 27, 2025 at 9:48:32 PM (PDT) Friday, March 28, 2025 at 4:48:32 (UTC) |
| Distance from |
Upland, CA - 2 km (1 miles) NE (55 degrees) Rancho Cucamonga, CA - 5 km (3 miles) WSW (250 degrees) Ontario, CA - 6 km (4 miles) N (359 degrees) Montclair, CA - 7 km (4 miles) ENE (58 degrees) Claremont, CA - 8 km (5 miles) E (81 degrees) |
| Coordinates | 34 deg. 6.5 min. N (34.109N), 117 deg. 37.7 min. W (117.629W) |
| Depth | 12.84 km (8.00 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=35, Nph=57, Dmin=1.6 km, Rmss=0.13 sec, Erho=0.21 km, Erzz=0.39 km, Gp=70 degrees |
| Event ID# | ci40911919 |
| Additional Information | Map First Motion Focal Mechanism Waveforms |
For more information, see https://earthquake.usgs.gov
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