Alaska earthquakes

M3.1 earthquake 216 km W of Adak, Alaska

A magnitude 3.1 earthquake struck 216 km W of Adak, Alaska on Sun, Dec 26, 2021, 1:30 AM HAST (11:30 UTC), 124 km (77 mi) below the surface.

A larger quake followed: M5.1 Andreanof Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Sun, Dec 26, 2021, 1:30 AM HAST
UTC: 2021-12-26 11:30:42 UTC
Depth: 124.2 km (77.2 mi), intermediate-depth
Epicenter: 52.051° N, 179.775° 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 6.9 km horizontally, 7.7 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 94°
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 57 in the 60 days after this one and 24 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 us7000gd83 (also filed as ak021gjk78bc). Read Sat, Sep 26, 2026, 12:35 AM UTC.