Alaska earthquakes

M2.7 earthquake 215 km W of Adak, Alaska

A magnitude 2.7 earthquake struck 215 km W of Adak, Alaska on Thu, Sep 16, 2021, 3:18 AM HADT (12:18 UTC), 73 km (45 mi) below the surface.

A larger quake followed: M6.1 187 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.

Open the live map with earthquakes

The earthquake

Magnitude: 2.7 (ml), micro
Local time: Thu, Sep 16, 2021, 3:18 AM HADT
UTC: 2021-09-16 12:18:57 UTC
Depth: 72.6 km (45.1 mi), intermediate-depth
Epicenter: 51.585° N, 179.714° 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, 7.1 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 159°
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 92 in the 30 days before it.

After

The first 60 of 107.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000fueg (also filed as ak021bwjg2eo). Read Thu, Sep 24, 2026, 12:17 PM UTC.