Alaska earthquakes

M3.5 earthquake 103 km E of Chignik, Alaska

A magnitude 3.5 earthquake struck 103 km E of Chignik, Alaska on Mon, Dec 27, 2021, 11:13 AM AKST (20:13 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.6 139 km E of Chignik, Alaska. This one was a foreshock.

Naknek 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: 3.5 (ml), minor
Local time: Mon, Dec 27, 2021, 11:13 AM AKST
UTC: 2021-12-27 20:13:12 UTC
Depth: 2.1 km (1.3 mi), shallow
Epicenter: 56.445° N, 156.750° 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: 1.1% of gravity
Peak ground velocity: -0.9 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: 111

Nearest places

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

Naknek, AlaskaPopulation 544. Forecast254 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 49 in the 60 days after this one and 43 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 ak021glczrrd (also filed as us6000gfp3). Read Wed, Sep 23, 2026, 10:58 PM UTC.