Alaska earthquakes

M4.1 earthquake 98 km SE of Atka, Alaska

A magnitude 4.1 earthquake struck 98 km SE of Atka, Alaska on Sat, May 22, 2021, 3:51 AM HADT (12:51 UTC), 45 km (28 mi) below the surface.

A larger quake followed: M4.6 125 km ESE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.1 (mb), light
Local time: Sat, May 22, 2021, 3:51 AM HADT
UTC: 2021-05-22 12:51:09 UTC
Depth: 45.0 km (27.9 mi), shallow
Epicenter: 51.504° N, 173.303° 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 6.5 km horizontally, 8.3 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 142°
Stations used: 77

Nearby

Within 100 km, magnitude 1.5 and up: 48 in the 60 days after this one and 21 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 us7000e5ax (also filed as ak0216j1rg1h). Read Thu, Sep 24, 2026, 10:21 AM UTC.