2025-05-23 04:38:38 (M4.0) Rat Islands, Aleutian Islands, Alaska 51.6 178.4 (1cbfb)

[USGS ENS <ens@xxxxxxxxxxxx>]

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

Preliminary Report

Magnitude	4.0
Date-Time	Universal Time (UTC): 23 May 2025 04:38:39 Time near the Epicenter (1): 22 May 2025 18:38:39 Time in your area (1): 22 May 2025 20:38:39
Location	51.642N 178.446E
Depth	72 km
Distances	340.6 km (211.2 mi) W of Adak, Alaska 1262.0 km (782.5 mi) ESE of Klyuchi, Russia 1355.2 km (840.2 mi) ESE of Petropavlovsk-Kamchatsky, Russia 1370.6 km (849.8 mi) ESE of Vilyuchinsk, Russia 1371.4 km (850.3 mi) ESE of Yelizovo, Russia
Location Uncertainty	Horizontal: 8.3 km; Vertical 5.7 km
Parameters	Nph = 50; Dmin = 36.0 km; Rmss = 0.72 seconds; Gp = 179° Version =
Event ID	us 7000q10h

(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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