Alaska earthquakes

M2.8 earthquake 223 km W of Adak, Alaska

A magnitude 2.8 earthquake struck 223 km W of Adak, Alaska on Mon, Sep 13, 2021, 1:06 PM HADT (22:06 UTC), 78 km (48 mi) below the surface.

A larger quake followed: M4.0 257 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: Mon, Sep 13, 2021, 1:06 PM HADT
UTC: 2021-09-13 22:06:37 UTC
Depth: 78.0 km (48.5 mi), intermediate-depth
Epicenter: 51.561° N, 179.835° 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 5.2 km horizontally, 7.4 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 161°
Stations used: 31

Nearby

Within 100 km, magnitude 1.5 and up: 121 in the 60 days after this one and 78 in the 30 days before it.

After

The first 60 of 121.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fqwg (also filed as ak021brqpr0i). Read Thu, Sep 24, 2026, 8:59 AM UTC.