Alaska earthquakes

M3.6 earthquake 50 km SSE of Chignik, Alaska

A magnitude 3.6 earthquake struck 50 km SSE of Chignik, Alaska on Mon, Feb 22, 2021, 7:38 AM AKST (16:38 UTC), 48 km (30 mi) below the surface.

A larger quake followed: M3.7 114 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: Mon, Feb 22, 2021, 7:38 AM AKST
UTC: 2021-02-22 16:38:38 UTC
Depth: 48.2 km (30.0 mi), shallow
Epicenter: 55.847° N, 158.231° W
Region: Alaska
Strongest shaking: III, weak 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: III, weak shaking
Peak ground acceleration: 211.0% of gravity
Peak ground velocity: 0.1 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.

How well it is located

Reviewed by a seismologist.

Stations used: 147

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast154 kmENE

Nearby

Within 100 km, magnitude 1.5 and up: 44 in the 60 days after this one and 35 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 ak0212fx8jyf (also filed as us6000dk3w). Read Sat, Sep 26, 2026, 12:44 PM UTC.