Alaska earthquakes

M5.3 earthquake 151 km WSW of Adak, Alaska

A magnitude 5.3 earthquake struck 151 km WSW of Adak, Alaska on Fri, Sep 11, 2026, 1:47 AM HADT (10:47 UTC), 41 km (25 mi) below the surface.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.3 (mb), moderate
Local time: Fri, Sep 11, 2026, 1:47 AM HADT
UTC: 2026-09-11 10:47:12 UTC
Depth: 40.9 km (25.4 mi), shallow
Epicenter: 51.213° N, 178.543° W
Region: Alaska
Strongest shaking: V, moderate shaking
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Tsunami Information Statement from the NTWC. Read the message

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: V, moderate shaking
Peak ground acceleration: 19.0% of gravity
Peak ground velocity: 5.7 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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.

Aftershock forecast

The chance of at least one aftershock this large or larger, from the USGS operational aftershock forecast, issued Tue, Sep 22, 2026, 10:47 AM UTC. The USGS updates it as the sequence unfolds.

Within	M3+	M4+	M5+	M6+	M7+
1 day	7%	Under 1%	Under 1%	Under 1%	Under 1%
1 week	30%	4%	Under 1%	Under 1%	Under 1%
1 month	58%	11%	1%	Under 1%	Under 1%
1 year	85%	27%	3%	Under 1%	Under 1%

In the coming week the USGS expects about 0 aftershocks of magnitude 3 or more, and most likely between 0 and 2.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.0 km horizontally, 4.6 km in depth
Magnitude uncertainty: ±0.02
Depth from: From location
Station coverage gap: 127°
Stations used: 107

Nearby

Within 100 km, magnitude 2.3 and up: 37 since this one and 76 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 us7000tgky (also filed as attl74mn, aka2026sadcxu). Read Tue, Sep 22, 2026, 10:34 PM UTC.