Alaska earthquakes

M3.5 earthquake 105 km WSW of Akhiok, Alaska

A magnitude 3.5 earthquake struck 105 km WSW of Akhiok, Alaska on Sat, Sep 4, 2021, 9:06 PM AKDT (05:06 UTC), 70 km (43 mi) below the surface.

A larger quake followed: M4.8 137 km ESE of Chignik, Alaska. This one was a foreshock.

Womens Bay 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: 3.5 (ml), minor
Local time: Sat, Sep 4, 2021, 9:06 PM AKDT
UTC: 2021-09-05 05:06:43 UTC
Depth: 69.5 km (43.2 mi), shallow
Epicenter: 56.490° N, 155.688° 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: 0.1% of gravity
Peak ground velocity: -3.7 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.

How well it is located

Reviewed by a seismologist.

Stations used: 139

Nearest places

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

Womens Bay, AlaskaPopulation 719. Forecast225 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 193 in the 60 days after this one and 6 in the 30 days before it.

After

The first 60 of 193.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021be8am5e (also filed as us7000f85c). Read Tue, Sep 22, 2026, 9:29 PM UTC.