Alaska earthquakes

M3.4 earthquake 126 km W of Nikolski, Alaska

A magnitude 3.4 earthquake struck 126 km W of Nikolski, Alaska on Fri, Sep 10, 2021, 8:49 AM HADT (17:49 UTC), 217 km (135 mi) below the surface.

A larger quake followed: M3.9 Fox Islands, Aleutian Islands, Alaska. This one was a foreshock.

Unalaska 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: 3.4 (ml), minor
Local time: Fri, Sep 10, 2021, 8:49 AM HADT
UTC: 2021-09-10 17:49:41 UTC
Depth: 217.4 km (135.1 mi), intermediate-depth
Epicenter: 53.035° N, 170.732° 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 13.4 km horizontally, 12.0 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 143°
Stations used: 60

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast293 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 10 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 us6000fsqm (also filed as ak021bmpdrjk). Read Sun, Sep 27, 2026, 10:18 AM UTC.