Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #3: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 11:39:38 AM (PST) on Wednesday, February 19, 2025.
The magnitude 1.6 event (a probable quarry explosion) occurred 3 km (2 miles) SSW of Clayton, CA.
The hypocentral depth is -0.20 km (-0.10 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Wednesday, February 19, 2025 at 11:39:38 AM (PST) Wednesday, February 19, 2025 at 19:39:38 (UTC) |
| Distance from |
Clayton, CA - 3 km (2 miles) SSW (213 degrees) Concord, CA - 8 km (5 miles) SE (134 degrees) Waldon, CA - 9 km (6 miles) E (94 degrees) Diablo, CA - 9 km (6 miles) N (3 degrees) Walnut Creek, CA - 10 km (6 miles) E (81 degrees) |
| Coordinates | 37 deg. 55.2 min. N (37.920N), 121 deg. 57.2 min. W (121.953W) |
| Depth | -0.20 km (-0.10 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=21, Nph=21, Dmin=3.1 km, Rmss=0.17 sec, Erho=0.26 km, Erzz=31.61 km, Gp=63 degrees |
| Event ID# | nc75136262 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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