Alaska earthquakes

M2.7 earthquake 154 km W of Adak, Alaska

A magnitude 2.7 earthquake struck 154 km W of Adak, Alaska on Thu, May 27, 2021, 11:33 AM HADT (20:33 UTC), 90 km (56 mi) below the surface.

A larger quake followed: M4.3 83 km W of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 2.7 (ml), micro
Local time: Thu, May 27, 2021, 11:33 AM HADT
UTC: 2021-05-27 20:33:29 UTC
Depth: 90.1 km (56.0 mi), intermediate-depth
Epicenter: 51.652° N, 178.846° 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 9.3 km horizontally, 4.5 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 116°
Stations used: 23

Nearby

Within 100 km, magnitude 1.5 and up: 115 in the 60 days after this one and 37 in the 30 days before it.

After

The first 60 of 115.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000efap (also filed as ak0216rg3tq4). Read Thu, Sep 24, 2026, 5:24 PM UTC.