Alaska earthquakes

M3.6 earthquake 46 km N of Atka, Alaska

A magnitude 3.6 earthquake struck 46 km N of Atka, Alaska on Fri, Apr 16, 2021, 11:54 PM HADT (08:54 UTC), 192 km (120 mi) below the surface.

A larger quake followed: M4.2 45 km E of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.6 (mb), minor
Local time: Fri, Apr 16, 2021, 11:54 PM HADT
UTC: 2021-04-17 08:54:10 UTC
Depth: 192.5 km (119.6 mi), intermediate-depth
Epicenter: 52.611° N, 174.241° 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 16.0 km horizontally, 7.2 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 130°
Stations used: 46

Nearby

Within 100 km, magnitude 1.5 and up: 22 in the 60 days after this one and 28 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 us6000e2c4 (also filed as ak0214x3l7hq). Read Thu, Sep 24, 2026, 11:11 AM UTC.