Alaska earthquakes

M3.6 earthquake 55 km SE of Chignik, Alaska

A magnitude 3.6 earthquake struck 55 km SE of Chignik, Alaska on Sun, Sep 20, 2026, 9:10 AM AKDT (17:10 UTC), 34 km (21 mi) below the surface.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.6 (ml), minor
Local time: Sun, Sep 20, 2026, 9:10 AM AKDT
UTC: 2026-09-20 17:10:13 UTC
Depth: 33.7 km (20.9 mi), shallow
Epicenter: 55.946° N, 157.772° 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: 0.4% of gravity
Peak ground velocity: 0.1 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. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.9 km horizontally, 6.2 km in depth
Magnitude uncertainty: ±0.20
Station coverage gap: 196°, poorly surrounded by stations
Stations used: 90

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast184 kmENE

Nearby

Within 100 km, magnitude 1.5 and up: 0 since this one and 24 in the 30 days before it.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event aka2026srgcdi (also filed as us7000tisd). Read Tue, Sep 22, 2026, 8:21 AM UTC.