Alaska earthquakes

M3.7 earthquake 152 km S of False Pass, Alaska

A magnitude 3.7 earthquake struck 152 km S of False Pass, Alaska on Mon, Sep 13, 2021, 8:09 AM AKDT (16:09 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.0 111 km SE 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.

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The earthquake

Magnitude: 3.7 (mb), minor
Local time: Mon, Sep 13, 2021, 8:09 AM AKDT
UTC: 2021-09-13 16:09:19 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 53.482° N, 163.428° 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 6.0 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.25
Depth from: Operator assigned
Station coverage gap: 220°, poorly surrounded by stations
Stations used: 37

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast170 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 56 in the 60 days after this one and 86 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000fc51 (also filed as ak021brn5r4v). Read Wed, Sep 23, 2026, 7:11 PM UTC.