Alaska earthquakes

M3.1 earthquake 37 km ESE of Atka, Alaska

A magnitude 3.1 earthquake struck 37 km ESE of Atka, Alaska on Fri, Dec 18, 2020, 9:39 PM HAST (07:39 UTC), 128 km (79 mi) below the surface.

A larger quake followed: M4.9 91 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: 3.1 (ml), minor
Local time: Fri, Dec 18, 2020, 9:39 PM HAST
UTC: 2020-12-19 07:39:08 UTC
Depth: 127.6 km (79.3 mi), intermediate-depth
Epicenter: 52.071° N, 173.696° 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 13.7 km horizontally, 12.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 193°, poorly surrounded by stations
Stations used: 28

Nearby

Within 100 km, magnitude 1.5 and up: 64 in the 60 days after this one and 30 in the 30 days before it.

After

The first 60 of 64.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000csgs (also filed as ak020g9knaa6). Read Tue, Sep 29, 2026, 11:57 PM UTC.