Alaska earthquakes

M4.0 earthquake 68 km SSW of Unalaska, Alaska

A magnitude 4.0 earthquake struck 68 km SSW of Unalaska, Alaska on Wed, Jan 27, 2021, 10:29 AM AKST (19:29 UTC), 59 km (37 mi) below the surface.

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: 4.0 (mb), light
Local time: Wed, Jan 27, 2021, 10:29 AM AKST
UTC: 2021-01-27 19:29:53 UTC
Depth: 58.8 km (36.5 mi), shallow
Epicenter: 53.288° N, 166.863° 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 7.5 km horizontally, 15.0 km in depth
Magnitude uncertainty: ±0.14
Depth from: From location
Station coverage gap: 118°
Stations used: 49

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast69 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 67 in the 60 days after this one and 36 in the 30 days before it.

After

The first 60 of 67.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dcgv (also filed as ak02118yzxr4). Read Wed, Sep 23, 2026, 9:30 PM UTC.