Alaska earthquakes

M2.8 earthquake 68 km WSW of Adak, Alaska

A magnitude 2.8 earthquake struck 68 km WSW of Adak, Alaska on Sat, Dec 4, 2021, 3:45 PM HAST (01:45 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.4 132 km WSW of Adak, Alaska. This one was a foreshock.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 2.8 (ml), micro
Local time: Sat, Dec 4, 2021, 3:45 PM HAST
UTC: 2021-12-05 01:45:56 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.584° N, 177.505° 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 4.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 196°, poorly surrounded by stations
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 182 in the 60 days after this one and 96 in the 30 days before it.

After

The first 60 of 182.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000g9s9 (also filed as ak021fko1uij). Read Sun, Sep 27, 2026, 1:12 PM UTC.