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 9:59:44 PM (PDT) on Tuesday, April 21, 2026.
The magnitude 1.5 event occurred 4 km (3 miles) SSW of Clayton, CA.
The hypocentral depth is 10 km ( 6 miles).
| Magnitude | 1.5 - duration magnitude (Md) |
| Time | Tuesday, April 21, 2026 at 9:59:44 PM (PDT) Wednesday, April 22, 2026 at 4:59:44 (UTC) |
| Distance from |
Clayton, CA - 4 km (3 miles) SSW (206 degrees) Diablo, CA - 8 km (5 miles) N (0 degrees) Concord, CA - 9 km (5 miles) SE (143 degrees) Walnut Creek, CA - 9 km (6 miles) E (90 degrees) Waldon, CA - 9 km (6 miles) ESE (104 degrees) |
| Coordinates | 37 deg. 54.4 min. N (37.906N), 121 deg. 57.4 min. W (121.957W) |
| Depth | 9.79 km (6.10 miles) |
| Quality | Good |
| Location Quality Parameters | Nst=25, Nph=24, Dmin=4.5 km, Rmss=0.06 sec, Erho=0.24 km, Erzz=0.50999999 km, Gp=102 degrees |
| Event ID# | nc75349382 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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