Alaska earthquakes

M3.6 earthquake 160 km SE of Chignik, Alaska

A magnitude 3.6 earthquake struck 160 km SE of Chignik, Alaska on Mon, Dec 13, 2021, 4:49 AM AKST (13:49 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M4.3 145 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: 3.6 (ml), minor
Local time: Mon, Dec 13, 2021, 4:49 AM AKST
UTC: 2021-12-13 13:49:48 UTC
Depth: 24.6 km (15.3 mi), shallow
Epicenter: 55.202° N, 156.742° 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: -5.0 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: 117

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast239 kmE

Nearby

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 21 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 ak021fy3inwx (also filed as us6000gbvl). Read Tue, Sep 22, 2026, 9:28 PM UTC.