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 9:59:01 PM (PDT) on Tuesday, October 21, 2025.
The magnitude 1.6 event occurred 9 km (5 miles) SW of Ridgemark, CA.
The hypocentral depth is 5 km ( 3 miles).
| Magnitude | 1.6 - duration magnitude (Md) |
| Time | Tuesday, October 21, 2025 at 9:59:01 PM (PDT) Wednesday, October 22, 2025 at 4:59:01 (UTC) |
| Distance from |
Ridgemark, CA - 9 km (5 miles) SW (235 degrees) Hollister, CA - 10 km (6 miles) SSW (205 degrees) San Juan Bautista, CA - 12 km (7 miles) SE (136 degrees) Prunedale, CA - 20 km (12 miles) E (92 degrees) Salinas, CA - 20 km (12 miles) ENE (62 degrees) |
| Coordinates | 36 deg. 46.1 min. N (36.769N), 121 deg. 26.7 min. W (121.445W) |
| Depth | 5.16 km (3.20 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=22, Nph=22, Dmin=0.5 km, Rmss=0.20 sec, Erho=0.48 km, Erzz=0.680000007 km, Gp=69 degrees |
| Event ID# | nc75252706 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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