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 11:35:34 PM (PDT) on Thursday, August 21, 2025.
The magnitude 1.6 event occurred 13 km (8 miles) NNW of Angwin, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Thursday, August 21, 2025 at 11:35:34 PM (PDT) Friday, August 22, 2025 at 6:35:34 (UTC) |
| Distance from |
Angwin, CA - 13 km (8 miles) NNW (342 degrees) Middletown, CA - 13 km (8 miles) SE (124 degrees) Calistoga, CA - 14 km (9 miles) NNE (31 degrees) Hidden Valley Lake, CA - 14 km (9 miles) SSE (158 degrees) Saint Helena, CA - 21 km (13 miles) N (354 degrees) |
| Coordinates | 38 deg. 41.3 min. N (38.689N), 122 deg. 29.8 min. W (122.496W) |
| Depth | 6.87 km (4.30 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=11, Nph=11, Dmin=7.8 km, Rmss=0.06 sec, Erho=0.31 km, Erzz=1.21000004 km, Gp=72 degrees |
| Event ID# | nc75227042 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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