Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #3: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A minor earthquake occurred at 7:57:56 PM (PST) on Friday, December 19, 2025.
The magnitude 3.1 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 5 km ( 3 miles).
| Magnitude | 3.1 - local magnitude (Ml) |
| Time | Friday, December 19, 2025 at 7:57:56 PM (PST) Saturday, December 20, 2025 at 3:57:56 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (142 degrees) Dublin, CA - 5 km (3 miles) NNW (348 degrees) Blackhawk, CA - 9 km (5 miles) SSW (205 degrees) Diablo, CA - 9 km (6 miles) S (175 degrees) Danville, CA - 9 km (6 miles) SSE (150 degrees) |
| Coordinates | 37 deg. 45.0 min. N (37.750N), 121 deg. 56.9 min. W (121.949W) |
| Depth | 4.65 km (2.90 miles) |
| Quality | Poor |
| Location Quality Parameters | Nst=47, Nph=59, Dmin=11.0 km, Rmss=0.68 sec, Erho=1.07 km, Erzz=2.093 km, Gp=38 degrees |
| Event ID# | nc75283036 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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