Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #905411: 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 3:47:13 AM (PDT) on Saturday, October 4, 2025.
The magnitude 2.1 event occurred 17 km (11 miles) NW of Portola, CA.
The hypocentral depth is -0.31 km (-0.20 miles).
| Magnitude | 2.1 - local magnitude (Ml) |
| Time | Saturday, October 4, 2025 at 3:47:13 AM (PDT) Saturday, October 4, 2025 at 10:47:13 (UTC) |
| Distance from |
Portola, CA - 17 km (11 miles) NW (309 degrees) East Quincy, CA - 23 km (14 miles) E (97 degrees) Quincy, CA - 27 km (17 miles) E (96 degrees) Greenville, CA - 38 km (23 miles) SE (133 degrees) Janesville, CA - 44 km (27 miles) SSW (192 degrees) |
| Coordinates | 39 deg. 54.6 min. N (39.910N), 120 deg. 37.6 min. W (120.627W) |
| Depth | -0.31 km (-0.20 miles) |
| Quality | Poor |
| Location Quality Parameters | Nst=16, Nph=16, Dmin=21.0 km, Rmss=0.07 sec, Erho=0.58 km, Erzz=7.71000004 km, Gp=252.32 degrees |
| Event ID# | nc75244656 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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