Alaska earthquakes

M2.6 earthquake 39 km ENE of Adak, Alaska

A magnitude 2.6 earthquake struck 39 km ENE of Adak, Alaska on Mon, Sep 21, 2026, 5:40 AM HADT (14:40 UTC), 171 km (107 mi) below the surface.

A larger quake followed: M4.1 34 km S 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: 2.6 (ML, local (Richter)), micro
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Sep 21, 2026, 5:40 AM HADT
UTC: 2026-09-21 14:40:39 UTC
Depth: 171.4 km (106.5 mi), intermediate-depth
Epicenter: 52.042° N, 176.131° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Confirmed · ±0.085 · 18 stations
2.1	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.6 · 12 stations

Did you feel it?

No one has reported feeling this quake to the USGS. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 15.8 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 88°
Stations used: 20

Nearby

Within 100 km, magnitude 1.5 and up: 21 since this one and 116 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tyeh (also filed as aka2026ssxdca). Read Sun, Oct 4, 2026, 1:54 AM UTC.