Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE 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 earthquake occurred at 8:13:38 AM (PDT) on Sunday, September 21, 2025.
The magnitude 1.0 event occurred 4 km (3 miles) SE of Ridgemark, CA.
The hypocentral depth is 7 km ( 4 miles).
| Magnitude | 1.0 - duration magnitude (Md) |
| Time | Sunday, September 21, 2025 at 8:13:38 AM (PDT) Sunday, September 21, 2025 at 15:13:38 (UTC) |
| Distance from |
Ridgemark, CA - 4 km (3 miles) SE (134 degrees) Hollister, CA - 9 km (6 miles) SE (139 degrees) San Juan Bautista, CA - 20 km (12 miles) ESE (110 degrees) Chualar, CA - 29 km (18 miles) NE (35 degrees) Prunedale, CA - 30 km (19 miles) E (88 degrees) |
| Coordinates | 36 deg. 47.2 min. N (36.786N), 121 deg. 19.9 min. W (121.332W) |
| Depth | 7.23 km (4.50 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=23, Nph=27, Dmin=2.2 km, Rmss=0.06 sec, Erho=0.2 km, Erzz=0.38 km, Gp=72 degrees |
| Event ID# | nc75240262 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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