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 3:47:48 PM (PST) on Sunday, December 28, 2025.
The magnitude 1.9 event occurred 4 km (2 miles) ESE of San Ramon, CA.
The hypocentral depth is 8 km ( 5 miles).
| Magnitude | 1.9 - duration magnitude (Md) |
| Time | Sunday, December 28, 2025 at 3:47:48 PM (PST) Sunday, December 28, 2025 at 23:47:48 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) ESE (123 degrees) Dublin, CA - 7 km (4 miles) N (356 degrees) Blackhawk, CA - 7 km (5 miles) SSW (204 degrees) Diablo, CA - 8 km (5 miles) S (170 degrees) Danville, CA - 8 km (5 miles) SE (143 degrees) |
| Coordinates | 37 deg. 45.7 min. N (37.761N), 121 deg. 56.5 min. W (121.941W) |
| Depth | 7.53 km (4.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=20, Nph=19, Dmin=11.2 km, Rmss=0.04 sec, Erho=0.19 km, Erzz=0.49000001 km, Gp=59 degrees |
| Event ID# | nc75287806 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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