Alaska earthquakes

M3.5 earthquake 68 km SE of Unalaska, Alaska

A magnitude 3.5 earthquake struck 68 km SE of Unalaska, Alaska on Thu, Dec 10, 2020, 7:17 AM AKST (16:17 UTC), 34 km (21 mi) below the surface.

A larger quake followed: M4.0 68 km SSW 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.

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The earthquake

Magnitude: 3.5 (ml), minor
Local time: Thu, Dec 10, 2020, 7:17 AM AKST
UTC: 2020-12-10 16:17:41 UTC
Depth: 34.4 km (21.4 mi), shallow
Epicenter: 53.417° N, 165.847° 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 3.0 km horizontally, 10.3 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 193°, poorly surrounded by stations
Stations used: 70

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast68 kmSE

Nearby

Within 100 km, magnitude 1.5 and up: 103 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 103.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000cpy4 (also filed as ak020fuu1en4). Read Thu, Sep 24, 2026, 10:21 AM UTC.