Alaska earthquakes

M3.1 earthquake 158 km WSW of Nikolski, Alaska

A magnitude 3.1 earthquake struck 158 km WSW of Nikolski, Alaska on Wed, Dec 8, 2021, 3:17 PM HAST (01:17 UTC), 123 km (76 mi) below the surface.

A larger quake followed: M4.8 171 km W of Nikolski, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Wed, Dec 8, 2021, 3:17 PM HAST
UTC: 2021-12-09 01:17:36 UTC
Depth: 122.8 km (76.3 mi), intermediate-depth
Epicenter: 52.499° N, 171.090° 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 15.9 km horizontally, 13.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 191°, poorly surrounded by stations
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: 26 in the 60 days after this one and 3 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gam8 (also filed as ak021fra16vz). Read Sun, Sep 27, 2026, 11:14 PM UTC.