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 12:39:59 PM (PST) on Sunday, December 21, 2025.
The magnitude 1.6 event occurred 2 km (1 miles) SE of San Ramon, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Sunday, December 21, 2025 at 12:39:59 PM (PST) Sunday, December 21, 2025 at 20:39:59 (UTC) |
| Distance from |
San Ramon, CA - 2 km (1 miles) SE (139 degrees) Dublin, CA - 7 km (4 miles) NNW (343 degrees) Danville, CA - 7 km (5 miles) SSE (151 degrees) Diablo, CA - 8 km (5 miles) S (182 degrees) Blackhawk, CA - 8 km (5 miles) SW (216 degrees) |
| Coordinates | 37 deg. 45.9 min. N (37.764N), 121 deg. 57.6 min. W (121.961W) |
| Depth | 6.64 km (4.10 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=6, Nph=6, Dmin=9.7 km, Rmss=0.02 sec, Erho=0.68 km, Erzz=1.55999994 km, Gp=195 degrees |
| Event ID# | nc75284281 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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