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 9:35:16 AM (PST) on Sunday, December 21, 2025.
The magnitude 2.1 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 9 km ( 6 miles).
| Magnitude | 2.1 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 9:35:16 AM (PST) Sunday, December 21, 2025 at 17:35:16 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (138 degrees) Dublin, CA - 5 km (3 miles) N (352 degrees) Blackhawk, CA - 9 km (5 miles) SSW (202 degrees) Danville, CA - 9 km (6 miles) SSE (148 degrees) Diablo, CA - 10 km (6 miles) S (173 degrees) |
| Coordinates | 37 deg. 45.0 min. N (37.750N), 121 deg. 56.7 min. W (121.944W) |
| Depth | 9.12 km (5.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=15, Nph=15, Dmin=10.7 km, Rmss=0.04 sec, Erho=0.25 km, Erzz=0.560000002 km, Gp=74 degrees |
| Event ID# | nc75284181 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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