Alaska earthquakes

M4.3 earthquake 70 km SSE of Akutan, Alaska

A magnitude 4.3 earthquake struck 70 km SSE of Akutan, Alaska on Thu, Aug 20, 2026, 5:11 PM AKDT (01:11 UTC), 50 km (31 mi) below the surface.

Akutan forecast More in Alaska

Map

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

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The earthquake

Magnitude: 4.3 (mwr), light
Local time: Thu, Aug 20, 2026, 5:11 PM AKDT
UTC: 2026-08-21 01:11:51 UTC
Depth: 50.1 km (31.2 mi), shallow
Epicenter: 53.572° N, 165.270° W
Region: Alaska
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: III, weak shaking
Peak ground acceleration: 0.3% of gravity
Peak ground velocity: 0.2 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 4.3 Mwr
Nodal plane 1: Strike 73°, dip 73°, rake 95°
Nodal plane 2: Strike 237°, dip 17°, rake 74°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.6 km horizontally, 6.1 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 158°
Stations used: 82

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Akutan, AlaskaPopulation 1,040. Forecast71 kmSSE

Nearby

Within 100 km, magnitude 1.5 and up: 96 since this one and 82 in the 30 days before it.

After

The first 60 of 96.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tmcf (also filed as aka2026qmpmeq). Read Wed, Sep 23, 2026, 3:35 AM UTC.