Alaska earthquakes

M2.8 earthquake 47 km S of Atka, Alaska

A magnitude 2.8 earthquake struck 47 km S of Atka, Alaska on Wed, Nov 17, 2021, 1:00 AM HAST (11:00 UTC), 68 km (42 mi) below the surface.

A larger quake followed: M3.3 46 km S of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Wed, Nov 17, 2021, 1:00 AM HAST
UTC: 2021-11-17 11:00:50 UTC
Depth: 68.2 km (42.4 mi), shallow
Epicenter: 51.775° N, 174.081° 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 9.8 km horizontally, 11.3 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 207°, poorly surrounded by stations
Stations used: 12

Nearby

Within 100 km, magnitude 1.5 and up: 57 in the 60 days after this one and 38 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 us6000g45r (also filed as ak021er228r4). Read Thu, Sep 24, 2026, 3:51 AM UTC.