Alaska earthquakes

M3.6 earthquake 103 km SE of Atka, Alaska

A magnitude 3.6 earthquake struck 103 km SE of Atka, Alaska on Fri, Nov 20, 2020, 5:16 PM HAST (03:16 UTC), 35 km (22 mi) below the surface.

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

Map

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The earthquake

Magnitude: 3.6 (ml), minor
Local time: Fri, Nov 20, 2020, 5:16 PM HAST
UTC: 2020-11-21 03:16:37 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.660° N, 172.980° 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 6.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 189°, poorly surrounded by stations
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 43 in the 60 days after this one and 18 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 us6000crb9 (also filed as ak020ez72yq1). Read Tue, Sep 29, 2026, 12:45 AM UTC.