Alaska earthquakes

M2.7 earthquake 112 km W of Adak, Alaska

A magnitude 2.7 earthquake struck 112 km W of Adak, Alaska on Mon, Dec 21, 2020, 11:05 AM HAST (21:05 UTC), 107 km (67 mi) below the surface.

A larger quake followed: M4.8 184 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.

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The earthquake

Magnitude: 2.7 (ml), micro
Local time: Mon, Dec 21, 2020, 11:05 AM HAST
UTC: 2020-12-21 21:05:20 UTC
Depth: 107.1 km (66.6 mi), intermediate-depth
Epicenter: 51.773° N, 178.262° 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 6.3 km horizontally, 5.3 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 143°
Stations used: 23

Nearby

Within 100 km, magnitude 1.5 and up: 122 in the 60 days after this one and 64 in the 30 days before it.

After

The first 60 of 122.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000d1rn (also filed as ak020gd3urvu). Read Sat, Sep 26, 2026, 12:56 PM UTC.