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 6:41:21 PM (PST) on Saturday, December 20, 2025.
The magnitude 1.8 event occurred 3 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 5 km ( 3 miles).
| Magnitude | 1.8 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 6:41:21 PM (PST) Sunday, December 21, 2025 at 2:41:21 (UTC) |
| Distance from |
San Ramon, CA - 3 km (2 miles) SE (133 degrees) Dublin, CA - 7 km (4 miles) NNW (347 degrees) Diablo, CA - 8 km (5 miles) S (177 degrees) Danville, CA - 8 km (5 miles) SSE (148 degrees) Blackhawk, CA - 8 km (5 miles) SSW (211 degrees) |
| Coordinates | 37 deg. 45.7 min. N (37.762N), 121 deg. 57.2 min. W (121.953W) |
| Depth | 5.38 km (3.30 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=8, Nph=8, Dmin=10.2 km, Rmss=0.12 sec, Erho=0.62 km, Erzz=1.96000004 km, Gp=143 degrees |
| Event ID# | nc75283706 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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