Alaska earthquakes

M3.6 earthquake 213 km ESE of Atka, Alaska

A magnitude 3.6 earthquake struck 213 km ESE of Atka, Alaska on Sun, Dec 20, 2020, 12:53 AM HAST (10:53 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M4.4 174 km SW of Nikolski, 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: 3.6 (ml), minor
Local time: Sun, Dec 20, 2020, 12:53 AM HAST
UTC: 2020-12-20 10:53:39 UTC
Depth: 25.3 km (15.7 mi), shallow
Epicenter: 51.664° N, 171.222° 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 5.3 km horizontally, 6.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 218°, poorly surrounded by stations
Stations used: 38

Nearby

Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 10 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 us7000csqu (also filed as ak020gba2496). Read Tue, Sep 29, 2026, 3:13 PM UTC.