Alaska earthquakes

M5.5 earthquake 88 km SE of Akutan, Alaska

A magnitude 5.5 earthquake struck 88 km SE of Akutan, Alaska on Sat, Apr 25, 2026, 12:05 AM AKDT (08:05 UTC), 24 km (15 mi) below the surface.

Akutan forecast More in Alaska

Map

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

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The earthquake

Magnitude: 5.5 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Apr 25, 2026, 12:05 AM AKDT
UTC: 2026-04-25 08:05:54 UTC
Depth: 23.6 km (14.7 mi), shallow
Epicenter: 53.583° N, 164.805° W
Region: Alaska
Felt reports: 12
Strongest shaking: IV, light shaking
PAGER alert: Green
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
5.5	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.046 · 46 stations
5.5	ML, local (Richter)	Alaska Earthquake Center	Reviewed · ±0.1 · 55 stations
5.5	Mww, W-phase moment	USGS, automatic first solution	First automatic solution · Preliminary

Shaking

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

Strongest estimated: IV, light shaking
Peak ground acceleration: 2.2% of gravity
Peak ground velocity: 1.8 cm/s
Map: Automatic

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

Did you feel it?

12 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Deaths: estimated chance of each range
Range	Chance
Under 1	95%
1 to 10	5%
10 to 100	Under 1%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Economic losses: estimated chance of each range
Range, million USD	Chance
Under 1	90%
1 to 10	9%
10 to 100	Under 1%
100 to 1,000	Under 1%
1,000 to 10,000	Under 1%
10,000 to 100,000	Under 1%
100,000 to 10,000,000	Under 1%

Aftershock forecast

The chance of at least one aftershock this large or larger, from the USGS operational aftershock forecast, issued Sat, Sep 26, 2026, 8:05 AM UTC. The USGS updates it as the sequence unfolds.

Within	M3+	M4+	M5+	M6+	M7+
1 day	3%	Under 1%	Under 1%	Under 1%	Under 1%
1 week	18%	2%	Under 1%	Under 1%	Under 1%
1 month	53%	8%	Under 1%	Under 1%	Under 1%
1 year	99%	43%	6%	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 1.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Oblique reverse
Moment magnitude: 5.5 Mww
Nodal plane 1: Strike 291°, dip 8°, rake 142°
Nodal plane 2: Strike 59°, dip 85°, rake 84°

More from the USGS

Thank you Rob

This marks the final public earthquake release issued by Rob at the USGS National Earthquake Information Center. Over the course of 12 years of distinguished service on the night shift, Rob processed more than 28,000 earthquakes and analyzed over 1.2 million seismic arrivals. The unparalleled quality of the nation’s earthquake assessments is made possible through the steadfast dedication and expertise of seismologists like Rob. We extend our deepest appreciation for Rob’s exemplary public service and offer our warmest wishes for a fulfilling time in his next adventures.

From the USGS event page for us6000sssg. U.S. Geological Survey text and figures are in the public domain.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.6 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 63°
Stations used: 120

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Akutan, AlaskaPopulation 1,040. Forecast88 kmSE

Nearby

Within 100 km, magnitude 2.5 and up: 149 in the 60 days after this one and 34 in the 30 days before it.

After

The first 60 of 149.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000sssg (also filed as usauto6000sssg, aka2026ibwxbm). Read Thu, Oct 1, 2026, 9:31 PM UTC.