Alaska earthquakes

M3.1 earthquake 137 km SSE of Perryville, Alaska

A magnitude 3.1 earthquake struck 137 km SSE of Perryville, Alaska on Thu, Oct 28, 2021, 4:23 AM AKDT (12:23 UTC), 20 km (13 mi) below the surface.

A larger quake followed: M5.1 95 km SSE 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: 3.1 (ml), minor
Local time: Thu, Oct 28, 2021, 4:23 AM AKDT
UTC: 2021-10-28 12:23:15 UTC
Depth: 20.4 km (12.7 mi), shallow
Epicenter: 54.767° N, 158.313° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.2 km horizontally, 8.0 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 217°, poorly surrounded by stations
Stations used: 25

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast153 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 124 in the 60 days after this one and 53 in the 30 days before it.

After

The first 60 of 124.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g9rf (also filed as ak021du01n32). Read Thu, Sep 24, 2026, 3:38 AM UTC.