Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro earthquake occurred at 0:56:13 AM (PST) on Saturday, December 27, 2025.
The magnitude 1.1 event occurred 4 km (3 miles) SSE of San Ramon, CA.
The hypocentral depth is 9 km ( 6 miles).
| Magnitude | 1.1 - duration magnitude (Md) |
| Time | Saturday, December 27, 2025 at 0:56:13 AM (PST) Saturday, December 27, 2025 at 8:56:13 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SSE (156 degrees) Dublin, CA - 5 km (3 miles) NNW (338 degrees) Danville, CA - 9 km (6 miles) SSE (157 degrees) Diablo, CA - 10 km (6 miles) S (180 degrees) Blackhawk, CA - 10 km (6 miles) SSW (207 degrees) |
| Coordinates | 37 deg. 44.6 min. N (37.744N), 121 deg. 57.5 min. W (121.958W) |
| Depth | 9.02 km (5.60 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=17, Nph=19, Dmin=9.5 km, Rmss=0.06 sec, Erho=0.27 km, Erzz=0.58 km, Gp=88 degrees |
| Event ID# | nc75287001 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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