Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 11:51:07 AM (PST) on Sunday, December 21, 2025.
The magnitude 2.0 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 9 km ( 6 miles).
| Magnitude | 2.0 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 11:51:07 AM (PST) Sunday, December 21, 2025 at 19:51:07 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (145 degrees) Dublin, CA - 5 km (3 miles) NNW (346 degrees) Danville, CA - 9 km (6 miles) SSE (152 degrees) Blackhawk, CA - 9 km (6 miles) SSW (205 degrees) Diablo, CA - 10 km (6 miles) S (176 degrees) |
| Coordinates | 37 deg. 44.9 min. N (37.748N), 121 deg. 57.0 min. W (121.950W) |
| Depth | 9.46 km (5.90 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=62, Nph=67, Dmin=4.6 km, Rmss=0.13 sec, Erho=0.14 km, Erzz=0.26 km, Gp=32 degrees |
| Event ID# | nc75284241 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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