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 #6: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 12:29:49 PM (PDT) on Thursday, July 31, 2025.
The magnitude 1.1 event (a probable quarry explosion) occurred 7 km (4 miles) ENE (66 degrees) of Vista, CA.
The hypocentral depth is -0.39 km (-0.20 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Thursday, July 31, 2025 at 12:29:49 PM (PDT) Thursday, July 31, 2025 at 19:29:49 (UTC) |
| Distance from |
Vista, CA - 7 km (4 miles) ENE (66 degrees) San Marcos, CA - 9 km (6 miles) N (355 degrees) Valley Center, CA - 13 km (8 miles) W (273 degrees) Oceanside, CA - 14 km (9 miles) E (84 degrees) Escondido, CA - 14 km (9 miles) NW (322 degrees) |
| Coordinates | 33 deg. 13.5 min. N (33.225N), 117 deg. 10.5 min. W (117.175W) |
| Depth | -0.39 km (-0.20 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=23, Nph=23, Dmin=7.2 km, Rmss=0.23 sec, Erho=0.5 km, Erzz=31.61 km, Gp=100 degrees |
| Event ID# | ci41249824 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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