Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California
Version #0: This report supersedes any earlier reports of this event. This is a computer-generated message. This event has not yet been reviewed by a seismologist.
A micro earthquake occurred at 1:33:27 AM (PDT) on Tuesday, September 23, 2025.
The magnitude 1.1 event occurred 3 km (2 miles) NNW of Piedmont, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.1 - duration magnitude (Md) |
| Time | Tuesday, September 23, 2025 at 1:33:27 AM (PDT) Tuesday, September 23, 2025 at 8:33:27 (UTC) |
| Distance from |
Piedmont, CA - 3 km (2 miles) NNW (347 degrees) Berkeley, CA - 4 km (2 miles) ESE (123 degrees) Emeryville, CA - 5 km (3 miles) ENE (57 degrees) Albany, CA - 6 km (4 miles) SE (126 degrees) Orinda, CA - 6 km (4 miles) WSW (244 degrees) |
| Coordinates | 37 deg. 51.3 min. N (37.854N), 122 deg. 14.4 min. W (122.240W) |
| Depth | 7.07 km (4.40 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=11, Nph=11, Dmin=2.5 km, Rmss=0.03 sec, Erho=0.31 km, Erzz=0.5 km, Gp=79 degrees |
| Event ID# | nc75240827 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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