Alaska earthquakes

M4.0 earthquake 65 km SW of Adak, Alaska

A magnitude 4.0 earthquake struck 65 km SW of Adak, Alaska on Wed, May 26, 2021, 3:41 PM HADT (00:41 UTC), 43 km (27 mi) below the surface.

A larger quake followed: M5.0 49 km ESE of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 4.0 (mb), light
Local time: Wed, May 26, 2021, 3:41 PM HADT
UTC: 2021-05-27 00:41:06 UTC
Depth: 43.4 km (27.0 mi), shallow
Epicenter: 51.388° N, 177.177° 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 5.4 km horizontally, 5.4 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 100°
Stations used: 104

Nearby

Within 100 km, magnitude 1.5 and up: 132 in the 60 days after this one and 39 in the 30 days before it.

After

The first 60 of 132.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000eeza (also filed as ak0216r48tck). Read Thu, Sep 24, 2026, 11:12 AM UTC.