Alaska earthquakes

M3.0 earthquake 56 km NE of Adak, Alaska

A magnitude 3.0 earthquake struck 56 km NE of Adak, Alaska on Wed, Dec 22, 2021, 9:26 AM HAST (19:26 UTC), 158 km (98 mi) below the surface.

A larger quake followed: M4.0 73 km ESE of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 3.0 (ml), minor
Local time: Wed, Dec 22, 2021, 9:26 AM HAST
UTC: 2021-12-22 19:26:28 UTC
Depth: 157.8 km (98.1 mi), intermediate-depth
Epicenter: 52.231° N, 176.042° 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 15.5 km horizontally, 7.7 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 173°
Stations used: 37

Nearby

Within 100 km, magnitude 1.5 and up: 137 in the 60 days after this one and 49 in the 30 days before it.

After

The first 60 of 137.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gcbi (also filed as ak021gd2sf8l). Read Sat, Sep 26, 2026, 7:47 PM UTC.