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 4:41:13 AM (PDT) on Thursday, August 21, 2025.
The magnitude 1.8 event occurred 15 km (10 miles) S of Ridgemark, CA.
The hypocentral depth is 2 km ( 1 mile).
| Magnitude | 1.8 - duration magnitude (Md) |
| Time | Thursday, August 21, 2025 at 4:41:13 AM (PDT) Thursday, August 21, 2025 at 11:41:13 (UTC) |
| Distance from |
Ridgemark, CA - 15 km (10 miles) S (172 degrees) Chualar, CA - 20 km (12 miles) NE (54 degrees) Hollister, CA - 20 km (12 miles) SSE (165 degrees) Gonzales, CA - 21 km (13 miles) NNE (26 degrees) San Juan Bautista, CA - 26 km (16 miles) SE (137 degrees) |
| Coordinates | 36 deg. 40.5 min. N (36.675N), 121 deg. 20.5 min. W (121.342W) |
| Depth | 2.19 km (1.40 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=28, Nph=27, Dmin=3.6 km, Rmss=0.15 sec, Erho=0.29 km, Erzz=0.870000005 km, Gp=52 degrees |
| Event ID# | nc75226707 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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