Alaska earthquakes

M2.8 earthquake 239 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 239 km W of Adak, Alaska on Sun, Dec 5, 2021, 9:05 PM HAST (07:05 UTC), 176 km (109 mi) below the surface.

A larger quake followed: M5.0 242 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Sun, Dec 5, 2021, 9:05 PM HAST
UTC: 2021-12-06 07:05:34 UTC
Depth: 176.1 km (109.4 mi), intermediate-depth
Epicenter: 52.003° N, 179.892° E
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 10.7 km horizontally, 11.9 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 184°, poorly surrounded by stations
Stations used: 16

Nearby

Within 100 km, magnitude 1.5 and up: 52 in the 60 days after this one and 26 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 us7000gb5i (also filed as ak021fmex6dw). Read Sun, Sep 27, 2026, 2:37 AM UTC.