Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #0: 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 8:51:43 PM (PST) on Sunday, December 21, 2025.
The magnitude 2.3 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 9 km ( 6 miles).
| Magnitude | 2.3 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 8:51:43 PM (PST) Monday, December 22, 2025 at 4:51:43 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (139 degrees) Dublin, CA - 5 km (3 miles) N (351 degrees) Blackhawk, CA - 8 km (5 miles) SSW (203 degrees) Diablo, CA - 9 km (6 miles) S (174 degrees) Danville, CA - 9 km (6 miles) SSE (149 degrees) |
| Coordinates | 37 deg. 45.0 min. N (37.751N), 121 deg. 56.8 min. W (121.946W) |
| Depth | 9.13 km (5.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=30, Nph=30, Dmin=10.6 km, Rmss=0.07 sec, Erho=0.18 km, Erzz=0.469999999 km, Gp=45 degrees |
| Event ID# | nc75284561 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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