Alaska earthquakes

M4.5 earthquake 117 km S of Unalaska, Alaska

A magnitude 4.5 earthquake struck 117 km S of Unalaska, Alaska on Fri, Apr 22, 2022, 11:21 PM AKDT (07:21 UTC), 17 km (10 mi) below the surface.

Unalaska 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: 4.5 (mb), light
Local time: Fri, Apr 22, 2022, 11:21 PM AKDT
UTC: 2022-04-23 07:21:50 UTC
Depth: 16.5 km (10.3 mi), shallow
Epicenter: 52.820° N, 166.703° 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: 0.1% of gravity
Peak ground velocity: -3.3 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.

Location uncertainty: About 4.5 km horizontally, 4.5 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 137°
Stations used: 100

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast118 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 137 in the 60 days after this one and 72 in the 30 days before it.

After

The first 60 of 137.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000hft5 (also filed as ak0225700v22). Read Sun, Sep 27, 2026, 3:50 PM UTC.