Alaska earthquakes

M3.3 earthquake 35 km SW of Atka, Alaska

A magnitude 3.3 earthquake struck 35 km SW of Atka, Alaska on Mon, Dec 28, 2020, 11:39 PM HAST (09:39 UTC), 91 km (56 mi) below the surface.

A larger quake followed: M4.9 91 km S of Atka, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Mon, Dec 28, 2020, 11:39 PM HAST
UTC: 2020-12-29 09:39:36 UTC
Depth: 90.8 km (56.4 mi), intermediate-depth
Epicenter: 51.986° N, 174.600° 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 11.8 km horizontally, 16.2 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 217°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 109 in the 60 days after this one and 38 in the 30 days before it.

After

The first 60 of 109.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000d7it (also filed as ak020gq57nxz). Read Sun, Sep 27, 2026, 12:46 AM UTC.