Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #3: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 11:01:26 AM (PDT) on Thursday, August 21, 2025.
The magnitude 1.5 event (a probable quarry explosion) occurred 6 km (4 miles) SE of Napa, CA.
The hypocentral depth is -0.14 km (-0.10 miles).
| Magnitude | 1.5 - duration magnitude (Md) |
| Time | Thursday, August 21, 2025 at 11:01:26 AM (PDT) Thursday, August 21, 2025 at 18:01:26 (UTC) |
| Distance from |
Napa, CA - 6 km (4 miles) SE (136 degrees) Green Valley, CA - 7 km (4 miles) W (276 degrees) American Canyon, CA - 10 km (6 miles) N (11 degrees) Vallejo, CA - 16 km (10 miles) N (359 degrees) Fairfield, CA - 17 km (11 miles) W (274 degrees) |
| Coordinates | 38 deg. 15.6 min. N (38.260N), 122 deg. 14.3 min. W (122.239W) |
| Depth | -0.14 km (-0.10 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=41, Nph=41, Dmin=3.1 km, Rmss=0.16 sec, Erho=0.18 km, Erzz=31.61 km, Gp=38 degrees |
| Event ID# | nc75226807 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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