Alaska earthquakes

M3.4 earthquake 115 km E of Chignik, Alaska

A magnitude 3.4 earthquake struck 115 km E of Chignik, Alaska on Sat, Oct 23, 2021, 3:02 PM AKDT (23:02 UTC), 49 km (30 mi) below the surface.

A larger quake followed: M3.5 99 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: 3.4 (ml), minor
Local time: Sat, Oct 23, 2021, 3:02 PM AKDT
UTC: 2021-10-23 23:02:32 UTC
Depth: 48.7 km (30.3 mi), shallow
Epicenter: 56.326° N, 156.539° 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: 0.3% of gravity
Peak ground velocity: -3.0 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: 70

Nearest places

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

Naknek, AlaskaPopulation 544. Forecast269 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 96 in the 60 days after this one and 103 in the 30 days before it.

After

The first 60 of 96.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021dlws705 (also filed as us6000fx3n). Read Wed, Sep 23, 2026, 1:51 AM UTC.