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 5:18:58 AM (PST) on Sunday, December 28, 2025.
The magnitude 2.6 event occurred 4 km (3 miles) ESE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 2.6 - duration magnitude (Md) |
| Time | Sunday, December 28, 2025 at 5:18:58 AM (PST) Sunday, December 28, 2025 at 13:18:58 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) ESE (109 degrees) Blackhawk, CA - 6 km (4 miles) SSW (201 degrees) Dublin, CA - 7 km (5 miles) N (2 degrees) Danville, CA - 8 km (5 miles) SE (136 degrees) Diablo, CA - 8 km (5 miles) SSE (164 degrees) |
| Coordinates | 37 deg. 46.1 min. N (37.768N), 121 deg. 56.0 min. W (121.933W) |
| Depth | 7.32 km (4.50 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=50, Nph=47, Dmin=11.4 km, Rmss=0.06 sec, Erho=0.12 km, Erzz=0.310000002 km, Gp=39 degrees |
| Event ID# | nc75287496 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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