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 8:31:25 PM (PST) on Friday, December 12, 2025.
The magnitude 2.2 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 2.2 - duration magnitude (Md) |
| Time | Friday, December 12, 2025 at 8:31:25 PM (PST) Saturday, December 13, 2025 at 4:31:25 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (131 degrees) Dublin, CA - 6 km (4 miles) N (356 degrees) Blackhawk, CA - 8 km (5 miles) SSW (201 degrees) Diablo, CA - 9 km (6 miles) S (170 degrees) Danville, CA - 9 km (6 miles) SE (145 degrees) |
| Coordinates | 37 deg. 45.2 min. N (37.754N), 121 deg. 56.4 min. W (121.940W) |
| Depth | 7.30 km (4.50 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=26, Nph=25, Dmin=11.1 km, Rmss=0.05 sec, Erho=0.16 km, Erzz=0.49000001 km, Gp=42 degrees |
| Event ID# | nc75278971 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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