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 9:19:32 PM (PDT) on Thursday, August 20, 2026.
The magnitude 1.8 event occurred 4 km (2 miles) ENE (76 degrees) of Saint Helena, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 1.8 - duration magnitude (Md) |
| Time | Thursday, August 20, 2026 at 9:19:32 PM (PDT) Friday, August 21, 2026 at 4:19:32 (UTC) |
| Distance from |
Saint Helena, CA - 4 km (2 miles) ENE (76 degrees) Angwin, CA - 7 km (4 miles) SSE (164 degrees) Yountville, CA - 14 km (9 miles) NNW (335 degrees) Calistoga, CA - 15 km (9 miles) ESE (119 degrees) Kenwood, CA - 15 km (9 miles) NE (43 degrees) |
| Coordinates | 38 deg. 30.8 min. N (38.514N), 122 deg. 25.6 min. W (122.427W) |
| Depth | 6.20 km (3.90 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=29, Nph=29, Dmin=5.8 km, Rmss=0.16 sec, Erho=0.29 km, Erzz=0.939999998 km, Gp=51 degrees |
| Event ID# | nc75422217 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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