Alaska earthquakes

M1.9 earthquake 170 km W of Adak, Alaska

A magnitude 1.9 earthquake struck 170 km W of Adak, Alaska on Tue, Feb 23, 2021, 3:24 AM HAST (13:24 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M5.4 185 km WSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 1.9 (ml), micro
Local time: Tue, Feb 23, 2021, 3:24 AM HAST
UTC: 2021-02-23 13:24:38 UTC
Depth: 4.5 km (2.8 mi), shallow
Epicenter: 51.766° N, 179.102° 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: 24

Nearby

Within 100 km, magnitude 1.5 and up: 87 in the 60 days after this one and 60 in the 30 days before it.

After

The first 60 of 87.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0212hiwlog (also filed as av91196291). Read Thu, Sep 24, 2026, 1:23 PM UTC.