Alaska earthquakes

M3.1 earthquake 267 km W of Adak, Alaska

A magnitude 3.1 earthquake struck 267 km W of Adak, Alaska on Mon, Feb 22, 2021, 1:57 PM GMT+12 (01:57 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.3 225 km W of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Mon, Feb 22, 2021, 1:57 PM GMT+12
UTC: 2021-02-22 01:57:25 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.509° N, 179.543° E
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, 2.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: Operator assigned
Station coverage gap: 346°, poorly surrounded by stations
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 22 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 us7000dhcp (also filed as ak0212fof4ak). Read Sat, Sep 26, 2026, 3:06 PM UTC.