Alaska earthquakes

M5.1 earthquake 122 km E of Chignik, Alaska

A magnitude 5.1 earthquake struck 122 km E of Chignik, Alaska on Tue, Sep 20, 2022, 12:37 AM AKDT (08:37 UTC), 27 km (17 mi) below the surface.

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: 5.1 (mww), moderate
Local time: Tue, Sep 20, 2022, 12:37 AM AKDT
UTC: 2022-09-20 08:37:39 UTC
Depth: 26.6 km (16.5 mi), shallow
Epicenter: 56.131° N, 156.448° W
Region: Alaska
Strongest shaking: III, weak shaking
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

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: 1.5% of gravity
Peak ground velocity: -0.7 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.

Fault motion and ground failure

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

Faulting: Normal
Moment magnitude: 5.1 Mww
Nodal plane 1: Strike 23°, dip 24°, rake -95°
Nodal plane 2: Strike 208°, dip 66°, rake -88°

How well it is located

Reviewed by a seismologist.

Stations used: 209

Nearest places

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

Sand Point, AlaskaPopulation 1,064. Forecast269 kmENE

Nearby

Within 100 km, magnitude 2.1 and up: 45 in the 60 days after this one and 25 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 ak022c33bs2x (also filed as at00rii2ms, us7000i9hn). Read Tue, Sep 29, 2026, 10:44 PM UTC.