Alaska earthquakes

M2.8 earthquake 266 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 266 km W of Adak, Alaska on Sat, Oct 9, 2021, 1:32 AM GMT+12 (13:32 UTC), 86 km (53 mi) below the surface.

A larger quake followed: M5.2 280 km WSW of Adak, 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: 2.8 (ml), micro
Local time: Sat, Oct 9, 2021, 1:32 AM GMT+12
UTC: 2021-10-08 13:32:19 UTC
Depth: 86.0 km (53.5 mi), intermediate-depth
Epicenter: 51.689° N, 179.508° E
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 4.0 km horizontally, 3.2 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 106°
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 112 in the 60 days after this one and 33 in the 30 days before it.

After

The first 60 of 112.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g9jl (also filed as ak021cwxy2iu). Read Sat, Sep 26, 2026, 8:54 AM UTC.