Alaska earthquakes

M3.6 earthquake 135 km E of Atka, Alaska

A magnitude 3.6 earthquake struck 135 km E of Atka, Alaska on Wed, Apr 20, 2022, 6:31 AM HADT (15:31 UTC), 72 km (45 mi) below the surface.

A larger quake followed: M3.9 66 km E of Atka, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.6 (mb), minor
Local time: Wed, Apr 20, 2022, 6:31 AM HADT
UTC: 2022-04-20 15:31:22 UTC
Depth: 72.0 km (44.7 mi), intermediate-depth
Epicenter: 52.128° N, 172.230° 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 9.0 km horizontally, 19.1 km in depth
Magnitude uncertainty: ±0.16
Depth from: From location
Station coverage gap: 200°, poorly surrounded by stations
Stations used: 25

Nearby

Within 100 km, magnitude 1.5 and up: 75 in the 60 days after this one and 15 in the 30 days before it.

After

The first 60 of 75.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000hf30 (also filed as ak0225268eex). Read Wed, Sep 30, 2026, 3:56 PM UTC.