Alaska earthquakes

M2.7 earthquake 186 km SSE of Adak, Alaska

A magnitude 2.7 earthquake struck 186 km SSE of Adak, Alaska on Wed, Dec 22, 2021, 8:48 AM HAST (18:48 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.8 161 km S of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.7 (ml), micro
Local time: Wed, Dec 22, 2021, 8:48 AM HAST
UTC: 2021-12-22 18:48:14 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.486° N, 175.129° 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 5.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 288°, poorly surrounded by stations
Stations used: 28

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 10 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 us6000gepp (also filed as ak021gd2bpfw). Read Thu, Sep 24, 2026, 7:06 AM UTC.