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 1:17:39 PM (PDT) on Monday, April 20, 2026.
The magnitude 1.1 event (a probable quarry explosion) occurred 7 km (5 miles) NNW of La Mesa, CA.
The hypocentral depth is -0.10 km (-0.10 miles).
| Magnitude | 1.1 - local magnitude (Ml) |
| Time | Monday, April 20, 2026 at 1:17:39 PM (PDT) Monday, April 20, 2026 at 20:17:39 (UTC) |
| Distance from |
La Mesa, CA - 7 km (5 miles) NNW (338 degrees) Santee, CA - 7 km (5 miles) W (262 degrees) El Cajon, CA - 9 km (6 miles) WNW (294 degrees) San Diego, CA - 10 km (6 miles) ENE (58 degrees) Lemon Grove, CA - 10 km (6 miles) N (349 degrees) |
| Coordinates | 32 deg. 49.7 min. N (32.829N), 117 deg. 3.1 min. W (117.052W) |
| Depth | -0.10 km (-0.10 miles) |
| Quality | Fair |
| Location Quality Parameters | Nst=31, Nph=37, Dmin=8.3 km, Rmss=0.28 sec, Erho=0.47 km, Erzz=31.61 km, Gp=84 degrees |
| Event ID# | ci41445784 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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