Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
Southern California Seismic Network: a cooperative project of
U.S. Geological Survey, Pasadena California
Caltech Seismological Laboratory, Pasadena, California
Version #5: 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 quarry occurred at 4:24:31 PM (PDT) on Sunday, September 21, 2025.
The magnitude 1.1 event (a probable quarry explosion) occurred 4 km (3 miles) NW of Boron, CA.
The hypocentral depth is -0.27 km (-0.20 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Sunday, September 21, 2025 at 4:24:31 PM (PDT) Sunday, September 21, 2025 at 23:24:31 (UTC) |
| Distance from |
Boron, CA - 4 km (3 miles) NW (319 degrees) Edwards Air Force Base, CA - 27 km (16 miles) ENE (59 degrees) California City, CA - 30 km (19 miles) ESE (111 degrees) Johannesburg, CA - 39 km (24 miles) S (186 degrees) Mojave, CA - 45 km (28 miles) E (93 degrees) |
| Coordinates | 35 deg. 1.6 min. N (35.027N), 117 deg. 40.8 min. W (117.680W) |
| Depth | -0.27 km (-0.20 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=29, Nph=38, Dmin=10.4 km, Rmss=0.19 sec, Erho=0.33 km, Erzz=0.7 km, Gp=42 degrees |
| Event ID# | ci40447722 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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