Alaska earthquakes

M3.2 earthquake 99 km ENE of Chignik, Alaska

A magnitude 3.2 earthquake struck 99 km ENE of Chignik, Alaska on Fri, Sep 17, 2021, 10:19 AM AKDT (18:19 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M4.8 137 km ESE 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: 3.2 (ml), minor
Local time: Fri, Sep 17, 2021, 10:19 AM AKDT
UTC: 2021-09-17 18:19:55 UTC
Depth: 6.7 km (4.2 mi), shallow
Epicenter: 56.617° N, 156.902° 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: 0.0% of gravity
Peak ground velocity: -4.7 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: 79

Nearest places

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

Naknek, AlaskaPopulation 544. Forecast235 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 179 in the 60 days after this one and 20 in the 30 days before it.

After

The first 60 of 179.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021byak7fd (also filed as us7000fc6q). Read Wed, Sep 23, 2026, 3:54 AM UTC.