Alaska earthquakes

M2.7 earthquake 39 km NW of Atka, Alaska

A magnitude 2.7 earthquake struck 39 km NW of Atka, Alaska on Sat, Feb 20, 2021, 8:20 AM HAST (18:20 UTC), 229 km (142 mi) below the surface.

A larger quake followed: M4.7 37 km SSW of Atka, 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: 2.7 (ml), micro
Local time: Sat, Feb 20, 2021, 8:20 AM HAST
UTC: 2021-02-20 18:20:42 UTC
Depth: 228.6 km (142.0 mi), intermediate-depth
Epicenter: 52.407° N, 174.674° 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 19.1 km horizontally, 10.1 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 166°
Stations used: 31

Nearby

Within 100 km, magnitude 1.5 and up: 81 in the 60 days after this one and 31 in the 30 days before it.

After

The first 60 of 81.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000djs2 (also filed as ak0212cn90ph). Read Thu, Sep 24, 2026, 11:10 AM UTC.