Alaska earthquakes

M3.8 earthquake 29 km SE of Unalaska, Alaska

A magnitude 3.8 earthquake struck 29 km SE of Unalaska, Alaska on Fri, Nov 20, 2020, 10:19 PM AKST (07:19 UTC), 74 km (46 mi) below the surface.

A larger quake followed: M4.0 67 km SE of Unalaska, 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.

Open the live map with earthquakes

The earthquake

Magnitude: 3.8 (mb), minor
Local time: Fri, Nov 20, 2020, 10:19 PM AKST
UTC: 2020-11-21 07:19:40 UTC
Depth: 73.9 km (45.9 mi), intermediate-depth
Epicenter: 53.661° N, 166.268° 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 7.2 km horizontally, 7.5 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 156°
Stations used: 102

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast29 kmSE

Nearby

Within 100 km, magnitude 1.5 and up: 94 in the 60 days after this one and 61 in the 30 days before it.

After

The first 60 of 94.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000crbc (also filed as ak020ez9hbxj). Read Fri, Sep 25, 2026, 10:38 PM UTC.