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 8:48:28 AM (PST) on Sunday, December 21, 2025.
The magnitude 2.1 event occurred 4 km (3 miles) ESE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 2.1 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 8:48:28 AM (PST) Sunday, December 21, 2025 at 16:48:28 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) ESE (119 degrees) Dublin, CA - 7 km (4 miles) N (360 degrees) Blackhawk, CA - 7 km (4 miles) SSW (201 degrees) Diablo, CA - 8 km (5 miles) SSE (167 degrees) Danville, CA - 9 km (5 miles) SE (140 degrees) |
| Coordinates | 37 deg. 45.7 min. N (37.762N), 121 deg. 56.2 min. W (121.936W) |
| Depth | 7.50 km (4.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=18, Nph=18, Dmin=11.7 km, Rmss=0.09 sec, Erho=0.29 km, Erzz=0.620000005 km, Gp=57 degrees |
| Event ID# | nc75284131 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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