2026-04-03 04:27:59 UPDATED: (M4.0) Rat Islands, Aleutian Islands, Alaska 52.0 176.3 (90be5)

M4.0 Earthquake - Rat Islands, Aleutian Islands, Alaska

Preliminary Report

Magnitude	4.0
Date-Time	Universal Time (UTC): 3 Apr 2026 04:28:00 Time near the Epicenter (1): 2 Apr 2026 18:28:00 Time in your area (1): 2 Apr 2026 20:28:00
Location	51.977N 176.298E
Depth	40 km
Distances	232.8 km (144.3 mi) ESE of Attu Station, Alaska 1116.2 km (692.0 mi) ESE of Klyuchi, Russia 1202.4 km (745.5 mi) ESE of Petropavlovsk-Kamchatsky, Russia 1217.8 km (755.1 mi) ESE of Vilyuchinsk, Russia 1218.6 km (755.6 mi) ESE of Yelizovo, Russia
Location Uncertainty	Horizontal: 8.0 km; Vertical 10.4 km
Parameters	Nph = 36; Dmin = 152.3 km; Rmss = 1.11 seconds; Gp = 193° Version =
Event ID	us 6000sma7 ***This event supersedes event AKa2026gnfrya.

(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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