2025-09-28 16:21:18 (M3.0) Idaho-Montana border region 44.6 -112.3 (90be5)

M3.0 Earthquake - Idaho-Montana border region

Preliminary Report

Magnitude	3.0
Date-Time	Universal Time (UTC): 28 Sep 2025 16:21:19 Time near the Epicenter (1): 28 Sep 2025 10:21:19 Time in your area (1): 28 Sep 2025 08:21:19
Location	44.571N 112.257W
Depth	10 km
Distances	24.1 km (14.9 mi) NNW of Spencer, Idaho 90.8 km (56.3 mi) NNW of Rexburg, Idaho 124.0 km (76.9 mi) N of Idaho Falls, Idaho 124.6 km (77.2 mi) N of Ammon, Idaho 225.4 km (139.7 mi) S of Helena, Montana
Location Uncertainty	Horizontal: 2.2 km; Vertical 2.0 km
Parameters	Nph = 36; Dmin = 31.1 km; Rmss = 0.51 seconds; Gp = 35° Version =
Event ID	us 6000rdg8

(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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