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 9:45:34 PM (PST) on Sunday, December 28, 2025.
The magnitude 2.1 event occurred 2 km (1 miles) ESE of San Ramon, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 2.1 - duration magnitude (Md) |
| Time | Sunday, December 28, 2025 at 9:45:34 PM (PST) Monday, December 29, 2025 at 5:45:34 (UTC) |
| Distance from |
San Ramon, CA - 2 km (1 miles) ESE (103 degrees) Blackhawk, CA - 6 km (4 miles) SW (218 degrees) Diablo, CA - 7 km (4 miles) S (176 degrees) Danville, CA - 7 km (4 miles) SE (141 degrees) Dublin, CA - 8 km (5 miles) N (350 degrees) |
| Coordinates | 37 deg. 46.5 min. N (37.775N), 121 deg. 57.1 min. W (121.952W) |
| Depth | 6.44 km (4.00 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=17, Nph=17, Dmin=9.9 km, Rmss=0.12 sec, Erho=0.35 km, Erzz=0.959999979 km, Gp=95 degrees |
| Event ID# | nc75288011 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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