Alaska earthquakes

M4.3 earthquake 162 km SE of Chignik, Alaska

A magnitude 4.3 earthquake struck 162 km SE of Chignik, Alaska on Sat, Dec 25, 2021, 1:15 AM AKST (10:15 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M4.4 128 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: 4.3 (ml), light
Local time: Sat, Dec 25, 2021, 1:15 AM AKST
UTC: 2021-12-25 10:15:55 UTC
Depth: 2.4 km (1.5 mi), shallow
Epicenter: 55.150° N, 156.799° W
Region: Alaska
Strongest shaking: II, 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: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: -3.4 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 4.2 Mwr
Nodal plane 1: Strike 45°, dip 64°, rake 109°
Nodal plane 2: Strike 186°, dip 32°, rake 56°

How well it is located

Reviewed by a seismologist.

Stations used: 165

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast236 kmE

Nearby

Within 100 km, magnitude 1.5 and up: 50 in the 60 days after this one and 18 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 ak021ghvz8wg (also filed as us6000gf78). Read Thu, Sep 24, 2026, 5:56 AM UTC.