2025-07-31 16:32:24 UPDATED: (M4.2) Southern California 34.2 -117.4 (1cbfb)

[USGS ENS <ens@xxxxxxxxxxxx>]

M4.2 Earthquake - Southern California

Preliminary Report

Magnitude	4.2
Date-Time	Universal Time (UTC): 31 Jul 2025 16:32:24 Time near the Epicenter (1): 31 Jul 2025 09:32:24 Time in your area (1): 31 Jul 2025 08:32:24
Location	34.155N 117.412W
Depth	5 km
Distances	6.2 km (3.8 mi) W of Muscoy, California 6.6 km (4.1 mi) NW of Rialto, California 7.3 km (4.5 mi) NNE of Fontana, California 9.5 km (5.9 mi) N of Bloomington, California 248.7 km (154.2 mi) NW of Mexicali, Mexico
Location Uncertainty	Horizontal: 0.3 km; Vertical 0.7 km
Parameters	Nph = 121; Dmin = 4.4 km; Rmss = 0.26 seconds; Gp = 27° Version = 2
Event ID	ci 41249496 ***This event supersedes event EW1753979540.

(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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