Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #2: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 1:08:44 PM (PDT) on Wednesday, August 12, 2026.
The magnitude 1.8 event (a probable quarry explosion) occurred 3 km (2 miles) SW of Clayton, CA.
The hypocentral depth is -0.21 km (-0.10 miles).
| Magnitude | 1.8 - duration magnitude (Md) |
| Time | Wednesday, August 12, 2026 at 1:08:44 PM (PDT) Wednesday, August 12, 2026 at 20:08:44 (UTC) |
| Distance from |
Clayton, CA - 3 km (2 miles) SW (220 degrees) Concord, CA - 7 km (5 miles) SE (133 degrees) Waldon, CA - 9 km (5 miles) E (92 degrees) Walnut Creek, CA - 10 km (6 miles) E (79 degrees) Pleasant Hill, CA - 10 km (6 miles) ESE (107 degrees) |
| Coordinates | 37 deg. 55.4 min. N (37.923N), 121 deg. 57.3 min. W (121.955W) |
| Depth | -0.21 km (-0.10 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=8, Nph=8, Dmin=4.4 km, Rmss=0.05 sec, Erho=0.35 km, Erzz=31.61 km, Gp=90 degrees |
| Event ID# | nc75417047 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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