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 2:58:05 AM (PST) on Sunday, December 21, 2025.
The magnitude 1.5 event occurred 2 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.5 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 2:58:05 AM (PST) Sunday, December 21, 2025 at 10:58:05 (UTC) |
| Distance from |
San Ramon, CA - 2 km (2 miles) SE (140 degrees) Dublin, CA - 7 km (4 miles) NNW (342 degrees) Danville, CA - 7 km (5 miles) SSE (152 degrees) Diablo, CA - 8 km (5 miles) S (181 degrees) Blackhawk, CA - 8 km (5 miles) SW (216 degrees) |
| Coordinates | 37 deg. 45.8 min. N (37.763N), 121 deg. 57.6 min. W (121.960W) |
| Depth | 7.52 km (4.70 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=4, Nph=4, Dmin=9.6 km, Rmss=0.01 sec, Erho=1.55 km, Erzz=2.63000011 km, Gp=195 degrees |
| Event ID# | nc75283951 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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