2025-10-03 03:19:01 (M3.9) Idaho-Montana border region 44.6 -112.2 (90be5)

M3.9 Earthquake - Idaho-Montana border region

Preliminary Report

Magnitude	3.9
Date-Time	Universal Time (UTC): 3 Oct 2025 03:19:02 Time near the Epicenter (1): 2 Oct 2025 21:19:02 Time in your area (1): 2 Oct 2025 19:19:02
Location	44.564N 112.248W
Depth	5 km
Distances	23.2 km (14.4 mi) NNW of Spencer, Idaho 89.8 km (55.7 mi) NNW of Rexburg, Idaho 123.2 km (76.4 mi) N of Idaho Falls, Idaho 123.7 km (76.7 mi) N of Ammon, Idaho 226.1 km (140.2 mi) S of Helena, Montana
Location Uncertainty	Horizontal: 1.9 km; Vertical 1.9 km
Parameters	Nph = 54; Dmin = 31.9 km; Rmss = 0.52 seconds; Gp = 34° Version =
Event ID	us 6000reed

(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
National Earthquake Information Center
U.S. Geological Survey


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