2025-09-21 09:30:27 UPDATED: (M5.5) Andreanof Islands, Aleutian Islands, Alaska 51.2 -178.1 (70fa9)

M5.5 Earthquake - Andreanof Islands, Aleutian Islands, Alaska

Preliminary Report

Magnitude	5.5
Date-Time	Universal Time (UTC): 21 Sep 2025 09:30:27 Time near the Epicenter (1): 20 Sep 2025 23:30:27 Time in your area (1): 21 Sep 2025 15:00:27
Location	51.215N 178.097W
Depth	24 km
Distances	125.3 km (77.7 mi) SW of Adak, Alaska 1492.8 km (925.5 mi) ESE of Klyuchi, Russia 1527.1 km (946.8 mi) S of Anadyr, Russia 1599.5 km (991.7 mi) ESE of Petropavlovsk-Kamchatsky, Russia 1615.1 km (1001.3 mi) ESE of Vilyuchinsk, Russia
Location Uncertainty	Horizontal: 4.0 km; Vertical 4.9 km
Parameters	Nph = 146; Dmin = 61.8 km; Rmss = 1.13 seconds; Gp = 53° Version =
Event ID	us 7000qxp1

(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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