2025-07-31 16:36:50 (M3.1) Southern California 34.1 -117.4 (90be5)

M3.1 Earthquake - Southern California

Preliminary Report

Magnitude	3.1
Date-Time	Universal Time (UTC): 31 Jul 2025 16:36:51 Time near the Epicenter (1): 31 Jul 2025 09:36:51 Time in your area (1): 31 Jul 2025 08:36:51
Location	34.141N 117.412W
Depth	6 km
Distances	5.4 km (3.4 mi) NW of Rialto, California 5.8 km (3.6 mi) NNE of Fontana, California 6.4 km (4.0 mi) WSW of Muscoy, California 8.0 km (4.9 mi) N of Bloomington, California 247.7 km (153.5 mi) NW of Mexicali, Mexico
Location Uncertainty	Horizontal: 0.2 km; Vertical 0.6 km
Parameters	Nph = 132; Dmin = 5.2 km; Rmss = 0.22 seconds; Gp = 18° Version = 4
Event ID	ci 41249512

(1) Nominal Standard Time; local and daylight savings time zone may differ.
For updates, maps, and technical information
see: Event Page or USGS Earthquake Hazards Program
CISN Southern California Management Center
Caltech Seismological Laboratory
U.S. Geological Survey

http://www.cisn.org/scmc.html
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