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 9:42:33 AM (PST) on Monday, December 8, 2025.
The magnitude 1.7 event occurred 4 km (2 miles) SE of San Ramon, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 1.7 - duration magnitude (Md) |
| Time | Monday, December 8, 2025 at 9:42:33 AM (PST) Monday, December 8, 2025 at 17:42:33 (UTC) |
| Distance from |
San Ramon, CA - 4 km (2 miles) SE (125 degrees) Dublin, CA - 7 km (4 miles) N (354 degrees) Blackhawk, CA - 7 km (5 miles) SSW (205 degrees) Diablo, CA - 8 km (5 miles) S (171 degrees) Danville, CA - 8 km (5 miles) SE (144 degrees) |
| Coordinates | 37 deg. 45.6 min. N (37.761N), 121 deg. 56.6 min. W (121.943W) |
| Depth | 6.01 km (3.70 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=10, Nph=10, Dmin=11.0 km, Rmss=0.11 sec, Erho=0.45 km, Erzz=1.39999998 km, Gp=108 degrees |
| Event ID# | nc75276701 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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