Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
Southern California Seismic Network: a cooperative project of
U.S. Geological Survey, Pasadena California
Caltech Seismological Laboratory, Pasadena, California
Version #3: 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 1:38:05 AM (PST) on Sunday, January 4, 2026.
The magnitude 1.0 event occurred 4 km (3 miles) SE of Ontario, CA.
The hypocentral depth is 4 km ( 2 miles).
| Magnitude | 1.0 - local magnitude (Ml) |
| Time | Sunday, January 4, 2026 at 1:38:05 AM (PST) Sunday, January 4, 2026 at 9:38:05 (UTC) |
| Distance from |
Ontario, CA - 4 km (3 miles) SE (137 degrees) Mira Loma, CA - 8 km (5 miles) WNW (296 degrees) Chino, CA - 9 km (5 miles) E (80 degrees) Upland, CA - 9 km (6 miles) SSE (149 degrees) Montclair, CA - 10 km (6 miles) SE (124 degrees) |
| Coordinates | 34 deg. 1.5 min. N (34.025N), 117 deg. 35.8 min. W (117.597W) |
| Depth | 4.06 km (2.50 miles) |
| Quality | Excellent |
| Location Quality Parameters | Nst=43, Nph=60, Dmin=1.3 km, Rmss=0.14 sec, Erho=0.15 km, Erzz=0.41 km, Gp=62 degrees |
| Event ID# | ci41151999 |
| Additional Information | Map |
For more information, see https://earthquake.usgs.gov
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