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 2:30:34 PM (PDT) on Tuesday, August 18, 2026.
The magnitude 1.4 event (a probable quarry explosion) occurred 5 km (3 miles) NE (48 degrees) of Rancho San Diego, CA.
The hypocentral depth is -0.26 km (-0.20 miles).
| Magnitude | 1.4 - local magnitude (Ml) |
| Time | Tuesday, August 18, 2026 at 2:30:34 PM (PDT) Tuesday, August 18, 2026 at 21:30:34 (UTC) |
| Distance from |
Rancho San Diego, CA - 5 km (3 miles) NE (48 degrees) Bostonia, CA - 5 km (3 miles) SE (128 degrees) El Cajon, CA - 7 km (4 miles) ESE (105 degrees) Jamul, CA - 7 km (4 miles) NNW (347 degrees) Winter Gardens, CA - 7 km (4 miles) SSE (147 degrees) |
| Coordinates | 32 deg. 46.7 min. N (32.779N), 116 deg. 53.6 min. W (116.894W) |
| Depth | -0.26 km (-0.20 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=36, Nph=36, Dmin=6.6 km, Rmss=0.26 sec, Erho=0.4 km, Erzz=31.61 km, Gp=78 degrees |
| Event ID# | ci41529648 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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