2026-08-21 03:14:24 (M4.2) Unimak Island region, Alaska 53.9 -163.3 (90be5)

M4.2 Earthquake - Unimak Island region, Alaska

Preliminary Report

Magnitude	4.2
Date-Time	Universal Time (UTC): 21 Aug 2026 03:14:24 Time near the Epicenter (1): 20 Aug 2026 19:14:24 Time in your area (1): 20 Aug 2026 19:14:24
Location	53.950N 163.341W
Depth	30 km
Distances	100.8 km (62.5 mi) S of False Pass, Alaska 1136.8 km (704.8 mi) SW of Anchorage, Alaska 1157.9 km (717.9 mi) SW of Eagle River, Alaska 1170.1 km (725.4 mi) SW of Knik-Fairview, Alaska 1609.1 km (997.6 mi) SE of Anadyr, Russia
Location Uncertainty	Horizontal: 4.6 km; Vertical 8.2 km
Parameters	Nph = 35; Dmin = 101.2 km; Rmss = 0.64 seconds; Gp = 154° Version =
Event ID	us 6000tmd6

(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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