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 1:59:33 AM (PST) on Saturday, December 20, 2025.
The magnitude 1.7 event occurred 4 km (3 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 1:59:33 AM (PST) Saturday, December 20, 2025 at 9:59:33 (UTC) |
| Distance from |
San Ramon, CA - 4 km (3 miles) SE (144 degrees) Dublin, CA - 5 km (3 miles) NNW (347 degrees) Blackhawk, CA - 9 km (5 miles) SSW (205 degrees) Danville, CA - 9 km (6 miles) SSE (151 degrees) Diablo, CA - 10 km (6 miles) S (176 degrees) |
| Coordinates | 37 deg. 45.0 min. N (37.750N), 121 deg. 57.0 min. W (121.950W) |
| Depth | 8.40 km (5.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=14, Nph=14, Dmin=10.2 km, Rmss=0.06 sec, Erho=0.37 km, Erzz=0.720000029 km, Gp=137 degrees |
| Event ID# | nc75283271 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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