Alaska earthquakes

M4.1 earthquake 34 km S of Adak, Alaska

A magnitude 4.1 earthquake struck 34 km S of Adak, Alaska on Fri, Oct 2, 2026, 4:03 PM HADT (01:03 UTC), 49 km (31 mi) below the surface.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.1 (mb, body-wave), light
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Oct 2, 2026, 4:03 PM HADT
UTC: 2026-10-03 01:03:12 UTC
Depth: 49.1 km (30.5 mi), shallow
Epicenter: 51.569° N, 176.686° W
Region: Alaska
Strongest shaking: IV, light shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
4.1	mb, body-wave	USGS National Earthquake Information Center	Preferred · Preliminary · ±0.079 · 43 stations
4.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary · ±0.2 · 35 stations

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: IV, light shaking
Peak ground acceleration: 2.7% of gravity
Peak ground velocity: 0.7 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.5 km horizontally, 3.2 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 182°, poorly surrounded by stations
Stations used: 33

Nearby

Within 100 km, magnitude 1.5 and up: 0 since this one and 131 in the 30 days before it.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tza4 (also filed as aka2026toadbl). Read Sat, Oct 3, 2026, 8:27 AM UTC.