Alaska earthquakes

M3.3 earthquake 43 km ENE of Adak, Alaska

A magnitude 3.3 earthquake struck 43 km ENE of Adak, Alaska on Mon, Nov 1, 2021, 6:48 AM HADT (15:48 UTC), 180 km (112 mi) below the surface.

A larger quake followed: M4.0 29 km SSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Mon, Nov 1, 2021, 6:48 AM HADT
UTC: 2021-11-01 15:48:54 UTC
Depth: 179.7 km (111.7 mi), intermediate-depth
Epicenter: 52.061° N, 176.071° 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 9.1 km horizontally, 5.1 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 101°
Stations used: 38

Nearby

Within 100 km, magnitude 1.5 and up: 116 in the 60 days after this one and 49 in the 30 days before it.

After

The first 60 of 116.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ga5z (also filed as ak021e0o4ral). Read Sat, Sep 26, 2026, 12:44 AM UTC.