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 11:38:41 AM (PDT) on Tuesday, March 17, 2026.
The magnitude 1.3 event (a probable quarry explosion) occurred 7 km (4 miles) WSW of Calistoga, CA.
The hypocentral depth is -1 km (-0.30 miles).
| Magnitude | 1.3 - duration magnitude (Md) |
| Time | Tuesday, March 17, 2026 at 11:38:41 AM (PDT) Tuesday, March 17, 2026 at 18:38:41 (UTC) |
| Distance from |
Calistoga, CA - 7 km (4 miles) WSW (251 degrees) Larkfield-Wikiup, CA - 9 km (6 miles) ENE (58 degrees) Santa Rosa, CA - 13 km (8 miles) NNE (18 degrees) Windsor, CA - 14 km (9 miles) E (85 degrees) Roseland, CA - 16 km (10 miles) NNE (22 degrees) |
| Coordinates | 38 deg. 33.5 min. N (38.558N), 122 deg. 39.5 min. W (122.658W) |
| Depth | -0.53 km (-0.30 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=39, Nph=39, Dmin=4.6 km, Rmss=0.11 sec, Erho=0.17 km, Erzz=31.61 km, Gp=31 degrees |
| Event ID# | nc75328977 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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