Alaska earthquakes

M3.6 earthquake 207 km SE of Perryville, Alaska

A magnitude 3.6 earthquake struck 207 km SE of Perryville, Alaska on Tue, Aug 31, 2021, 2:15 PM AKDT (22:15 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M3.7 131 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: 3.6 (ml), minor
Local time: Tue, Aug 31, 2021, 2:15 PM AKDT
UTC: 2021-08-31 22:15:52 UTC
Depth: 24.9 km (15.5 mi), shallow
Epicenter: 54.611° N, 156.800° W
Region: Alaska
Strongest shaking: I, not felt shaking
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: -5.8 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.

How well it is located

Reviewed by a seismologist.

Stations used: 115

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast250 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 59 in the 60 days after this one and 140 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 ak021b68s6tw (also filed as us7000f6f2). Read Tue, Sep 22, 2026, 8:36 PM UTC.