2026-08-21 01:49:29 UPDATED: (M3.4) Rat Islands, Aleutian Islands, Alaska 52.0 176.4 (90be5)

M3.4 Earthquake - Rat Islands, Aleutian Islands, Alaska

Preliminary Report

Magnitude	3.4
Date-Time	Universal Time (UTC): 21 Aug 2026 01:49:30 Time near the Epicenter (1): 20 Aug 2026 15:49:30 Time in your area (1): 20 Aug 2026 17:49:30
Location	52.009N 176.359E
Depth	32 km
Distances	235.1 km (145.7 mi) ESE of Attu Station, Alaska 1117.9 km (693.1 mi) ESE of Klyuchi, Russia 1205.8 km (747.6 mi) ESE of Petropavlovsk-Kamchatsky, Russia 1221.2 km (757.2 mi) ESE of Vilyuchinsk, Russia 1221.9 km (757.6 mi) ESE of Yelizovo, Russia
Location Uncertainty	Horizontal: 7.0 km; Vertical 6.6 km
Parameters	Nph = 21; Dmin = 148.1 km; Rmss = 0.70 seconds; Gp = 190° Version =
Event ID	us 6000tmds ***This event supersedes event AKa2026qmqtbs.

(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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