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 0:46:10 AM (PST) on Saturday, December 20, 2025.
The magnitude 1.6 event occurred 3 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 0:46:10 AM (PST) Saturday, December 20, 2025 at 8:46:10 (UTC) |
| Distance from |
San Ramon, CA - 3 km (2 miles) SE (135 degrees) Dublin, CA - 7 km (4 miles) NNW (346 degrees) Diablo, CA - 8 km (5 miles) S (178 degrees) Danville, CA - 8 km (5 miles) SSE (149 degrees) Blackhawk, CA - 8 km (5 miles) SSW (212 degrees) |
| Coordinates | 37 deg. 45.7 min. N (37.762N), 121 deg. 57.3 min. W (121.955W) |
| Depth | 6.81 km (4.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=10, Nph=10, Dmin=10.0 km, Rmss=0.02 sec, Erho=0.31 km, Erzz=0.980000019 km, Gp=143 degrees |
| Event ID# | nc75283241 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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