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 7:23:21 PM (PST) on Saturday, December 20, 2025.
The magnitude 1.5 event occurred 3 km (2 miles) SSE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.5 - duration magnitude (Md) |
| Time | Saturday, December 20, 2025 at 7:23:21 PM (PST) Sunday, December 21, 2025 at 3:23:21 (UTC) |
| Distance from |
San Ramon, CA - 3 km (2 miles) SSE (151 degrees) Dublin, CA - 6 km (4 miles) NNW (339 degrees) Danville, CA - 8 km (5 miles) SSE (155 degrees) Blackhawk, CA - 9 km (5 miles) SSW (212 degrees) Diablo, CA - 9 km (6 miles) S (182 degrees) |
| Coordinates | 37 deg. 45.3 min. N (37.755N), 121 deg. 57.6 min. W (121.961W) |
| Depth | 8.39 km (5.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=9, Nph=9, Dmin=9.4 km, Rmss=0.03 sec, Erho=0.35 km, Erzz=0.5 km, Gp=130 degrees |
| Event ID# | nc75283756 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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