Alaska earthquakes

M3.7 earthquake 255 km W of Adak, Alaska

A magnitude 3.7 earthquake struck 255 km W of Adak, Alaska on Sat, Feb 27, 2021, 9:28 AM GMT+12 (21:28 UTC), 83 km (51 mi) below the surface.

A larger quake followed: M5.0 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.7 (ml), minor
Local time: Sat, Feb 27, 2021, 9:28 AM GMT+12
UTC: 2021-02-26 21:28:58 UTC
Depth: 82.5 km (51.3 mi), intermediate-depth
Epicenter: 51.605° N, 179.689° 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 15.8 km horizontally, 11.6 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 198°, poorly surrounded by stations
Stations used: 36

Nearby

Within 100 km, magnitude 1.5 and up: 28 in the 60 days after this one and 27 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 us7000dk13 (also filed as ak0212mmb4dw). Read Thu, Sep 24, 2026, 3:35 PM UTC.