Alaska earthquakes

M1.7 earthquake 77 km WSW of Adak, Alaska

A magnitude 1.7 earthquake struck 77 km WSW of Adak, Alaska on Tue, Dec 21, 2021, 3:43 PM HAST (01:43 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M4.4 132 km WSW of Adak, Alaska. This one was a foreshock.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 1.7 (ml), micro
Local time: Tue, Dec 21, 2021, 3:43 PM HAST
UTC: 2021-12-22 01:43:13 UTC
Depth: 26.0 km (16.2 mi), shallow
Epicenter: 51.526° N, 177.610° 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.

Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 197 in the 60 days after this one and 75 in the 30 days before it.

After

The first 60 of 197.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021gcs689p (also filed as av91448856). Read Thu, Sep 24, 2026, 1:43 PM UTC.