Alaska earthquakes

M4.2 earthquake 45 km E of Atka, Alaska

A magnitude 4.2 earthquake struck 45 km E of Atka, Alaska on Sun, May 30, 2021, 9:07 AM HADT (18:07 UTC), 148 km (92 mi) below the surface.

A larger quake followed: M4.6 125 km ESE of Atka, 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: 4.2 (mb), light
Local time: Sun, May 30, 2021, 9:07 AM HADT
UTC: 2021-05-30 18:07:24 UTC
Depth: 147.6 km (91.7 mi), intermediate-depth
Epicenter: 52.206° N, 173.534° 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 7.3 km horizontally, 6.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 192°, poorly surrounded by stations
Stations used: 46

Nearby

Within 100 km, magnitude 1.5 and up: 62 in the 60 days after this one and 10 in the 30 days before it.

After

The first 60 of 62.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000eg1q (also filed as ak0216wddevi). Read Sat, Sep 26, 2026, 12:00 PM UTC.