Alaska earthquakes

M2.7 earthquake 12 km WNW of Atka, Alaska

A magnitude 2.7 earthquake struck 12 km WNW of Atka, Alaska on Thu, Mar 11, 2021, 6:04 PM HAST (04:04 UTC), 186 km (115 mi) below the surface.

A larger quake followed: M4.0 33 km S 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: Thu, Mar 11, 2021, 6:04 PM HAST
UTC: 2021-03-12 04:04:37 UTC
Depth: 185.5 km (115.3 mi), intermediate-depth
Epicenter: 52.246° N, 174.361° 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 15.3 km horizontally, 3.7 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 140°
Stations used: 23

Nearby

Within 100 km, magnitude 1.5 and up: 84 in the 60 days after this one and 40 in the 30 days before it.

After

The first 60 of 84.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dxrf (also filed as ak02139hkb9i). Read Thu, Sep 24, 2026, 7:06 AM UTC.