Alaska earthquakes

M3.7 earthquake 152 km SE of Akutan, Alaska

A magnitude 3.7 earthquake struck 152 km SE of Akutan, Alaska on Fri, Aug 20, 2021, 1:02 AM AKDT (09:02 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M4.5 147 km S of False Pass, Alaska. This one was a foreshock.

Akutan forecast More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 3.7 (mb), minor
Local time: Fri, Aug 20, 2021, 1:02 AM AKDT
UTC: 2021-08-20 09:02:02 UTC
Depth: 27.3 km (17.0 mi), shallow
Epicenter: 53.280° N, 163.964° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.1 km horizontally, 3.3 km in depth
Magnitude uncertainty: ±0.14
Depth from: From location
Station coverage gap: 172°
Stations used: 56

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast152 kmSE

Nearby

Within 100 km, magnitude 1.5 and up: 113 in the 60 days after this one and 62 in the 30 days before it.

After

The first 60 of 113.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f8qw (also filed as ak021anu1v0t). Read Wed, Sep 23, 2026, 3:20 PM UTC.