Alaska earthquakes

M3.8 earthquake 88 km E of Nikolski, Alaska

A magnitude 3.8 earthquake struck 88 km E of Nikolski, Alaska on Fri, Nov 20, 2020, 10:16 AM AKST (19:16 UTC), 71 km (44 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: 3.8 (mb), minor
Local time: Fri, Nov 20, 2020, 10:16 AM AKST
UTC: 2020-11-20 19:16:10 UTC
Depth: 71.0 km (44.1 mi), intermediate-depth
Epicenter: 53.002° N, 167.551° 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 5.6 km horizontally, 6.8 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 166°
Stations used: 78

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast118 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 34 in the 30 days before it.

After

The first 60 of 186.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000cs1e (also filed as ak020ext2hf1). Read Sun, Sep 27, 2026, 11:19 PM UTC.