Alaska earthquakes

M3.9 earthquake 201 km SE of Chignik, Alaska

A magnitude 3.9 earthquake struck 201 km SE of Chignik, Alaska on Wed, Oct 13, 2021, 3:34 AM AKDT (11:34 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M4.0 140 km SSE of Chignik, 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: 3.9 (ml), minor
Local time: Wed, Oct 13, 2021, 3:34 AM AKDT
UTC: 2021-10-13 11:34:21 UTC
Depth: 4.1 km (2.5 mi), shallow
Epicenter: 54.913° N, 156.226° W
Region: Alaska
Felt reports: 1
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: -3.9 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.

How well it is located

Reviewed by a seismologist.

Stations used: 131

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast276 kmE

Nearby

Within 100 km, magnitude 1.5 and up: 42 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 ak021d56gdez (also filed as us6000fu77). Read Wed, Sep 23, 2026, 5:19 AM UTC.