Alaska earthquakes

M4.0 earthquake 81 km NE of Adak, Alaska

A magnitude 4.0 earthquake struck 81 km NE of Adak, Alaska on Sun, Aug 21, 2022, 4:26 PM HADT (01:26 UTC), 218 km (136 mi) below the surface.

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The earthquake

Magnitude: 4.0 (mb), light
Local time: Sun, Aug 21, 2022, 4:26 PM HADT
UTC: 2022-08-22 01:26:03 UTC
Depth: 218.2 km (135.6 mi), intermediate-depth
Epicenter: 52.376° N, 175.774° 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 13.9 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 125°
Stations used: 36

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 56 in the 30 days before it.

After

The first 60 of 74.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000icmh (also filed as ak022ar0i81b). Read Wed, Sep 30, 2026, 11:20 PM UTC.