Alaska earthquakes

M4.1 earthquake 83 km SW of Unalaska, Alaska

A magnitude 4.1 earthquake struck 83 km SW of Unalaska, Alaska on Mon, Nov 16, 2020, 7:43 AM AKST (16:43 UTC), 36 km (22 mi) below the surface.

A larger quake followed: M6.4 46 km ESE of Nikolski, Alaska. This one was a foreshock.

Unalaska forecast More in Alaska

Map

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

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The earthquake

Magnitude: 4.1 (mb), light
Local time: Mon, Nov 16, 2020, 7:43 AM AKST
UTC: 2020-11-16 16:43:06 UTC
Depth: 35.9 km (22.3 mi), shallow
Epicenter: 53.311° N, 167.366° 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 4.3 km horizontally, 8.7 km in depth
Magnitude uncertainty: ±0.11
Depth from: From location
Station coverage gap: 142°
Stations used: 66

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Unalaska, AlaskaPopulation 4,491. Forecast83 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 190 in the 60 days after this one and 35 in the 30 days before it.

After

The first 60 of 190.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000cfrd (also filed as ak020er5akk4). Read Sat, Sep 26, 2026, 1:46 AM UTC.