Alaska earthquakes

M4.1 earthquake 200 km SE of Perryville, Alaska

A magnitude 4.1 earthquake struck 200 km SE of Perryville, Alaska on Wed, Aug 11, 2021, 12:15 AM AKDT (08:15 UTC), 30 km (18 mi) below the surface.

A larger quake followed: M6.9 125 km SE of Perryville, Alaska. This one was a foreshock.

Sand Point 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: 4.1 (ml), light
Local time: Wed, Aug 11, 2021, 12:15 AM AKDT
UTC: 2021-08-11 08:15:15 UTC
Depth: 29.5 km (18.3 mi), shallow
Epicenter: 54.689° N, 156.818° W
Region: Alaska
Strongest shaking: I, not felt shaking
PAGER alert: Green
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

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

Strongest estimated: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -4.1 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.

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	69%
1 to 10	29%
10 to 100	2%
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	65%
1 to 10	30%
10 to 100	4%
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%

How well it is located

Reviewed by a seismologist.

Stations used: 169

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast246 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 186 in the 60 days after this one and 13 in the 30 days before it.

After

The first 60 of 186.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021a8xp3lk (also filed as us6000f43h). Read Tue, Sep 22, 2026, 7:42 PM UTC.