Recent Earthquakes in California and Nevada
== PRELIMINARY EVENT REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #5: This report supersedes any earlier reports of this event. This event has been reviewed by a seismologist.
A micro quarry occurred at 1:02:50 PM (PDT) on Wednesday, September 3, 2025.
The magnitude 1.9 event (a probable quarry explosion) occurred 3 km (2 miles) SW of Clayton, CA.
The hypocentral depth is -0.26 km (-0.20 miles).
| Magnitude | 1.9 - duration magnitude (Md) |
| Time | Wednesday, September 3, 2025 at 1:02:50 PM (PDT) Wednesday, September 3, 2025 at 20:02:50 (UTC) |
| Distance from |
Clayton, CA - 3 km (2 miles) SW (218 degrees) Concord, CA - 7 km (5 miles) SE (133 degrees) Waldon, CA - 9 km (6 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. 57.2 min. W (121.954W) |
| Depth | -0.26 km (-0.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=27, Nph=27, Dmin=3.0 km, Rmss=0.19 sec, Erho=0.25 km, Erzz=31.61 km, Gp=69 degrees |
| Event ID# | nc75232782 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
[
Index map ||
Big earthquake list ||
All earthquake list ||
Glossary of terms ||
Top page
]
[
Did you feel it? ||
ShakeMaps
|| Relative2Me
]
[ Data Sources ]
Special maps
Long Valley || Los Angeles || San Francisco
Data Sources
US and World - USGS/NEIC = National Earthquake Information Center
Northern California - UCB = University of California, Berkeley
Southern California - Caltech = California Institute of Technology
Nevada - UNR = University of Nevada, Reno
Offshore = West Coast & Alaska Tsunami Warning Center
...all members of the Advanced National Seismic System (ANSS)
