Alaska earthquakes

M2.8 earthquake 112 km WSW of Adak, Alaska

A magnitude 2.8 earthquake struck 112 km WSW of Adak, Alaska on Thu, Nov 18, 2021, 7:21 AM HAST (17:21 UTC), 22 km (14 mi) below the surface.

A larger quake followed: M5.1 Andreanof Islands, Aleutian Islands, 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: 2.8 (ml), micro
Local time: Thu, Nov 18, 2021, 7:21 AM HAST
UTC: 2021-11-18 17:21:36 UTC
Depth: 22.3 km (13.8 mi), shallow
Epicenter: 51.395° N, 178.071° 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 4.9 km horizontally, 15.8 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 201°, poorly surrounded by stations
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 142 in the 60 days after this one and 61 in the 30 days before it.

After

The first 60 of 142.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000gdwg (also filed as ak021estap2n). Read Thu, Sep 24, 2026, 1:43 PM UTC.