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 11:29:11 PM (PDT) on Thursday, July 23, 2026.
The magnitude 2.1 event occurred 6 km (3 miles) E (97 degrees) of Challenge-Brownsville, CA.
The hypocentral depth is 6 km ( 4 miles).
| Magnitude | 2.1 - duration magnitude (Md) |
| Time | Thursday, July 23, 2026 at 11:29:11 PM (PDT) Friday, July 24, 2026 at 6:29:11 (UTC) |
| Distance from |
Challenge-Brownsville, CA - 6 km (3 miles) E (97 degrees) Oroville East, CA - 24 km (15 miles) ESE (104 degrees) Loma Rica, CA - 25 km (15 miles) NE (49 degrees) Lake Wildwood, CA - 25 km (16 miles) N (0 degrees) Nevada City, CA - 27 km (17 miles) NW (324 degrees) |
| Coordinates | 39 deg. 27.5 min. N (39.458N), 121 deg. 11.9 min. W (121.199W) |
| Depth | 5.95 km (3.70 miles) |
| Quality | Poor |
| Location Quality Parameters | Nst=5, Nph=5, Dmin=24.5 km, Rmss=0.08 sec, Erho=0.65 km, Erzz=5.11999989 km, Gp=128 degrees |
| Event ID# | nc75404832 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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