Alaska earthquakes

M4.7 earthquake 83 km SSW of Unalaska, Alaska

A magnitude 4.7 earthquake struck 83 km SSW of Unalaska, Alaska on Tue, Oct 11, 2022, 2:07 PM AKDT (22:07 UTC), 44 km (27 mi) below the surface.

A larger quake followed: M4.8 82 km SSW of Unalaska, Alaska. This one was a foreshock.

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: 4.7 (mwr), light
Local time: Tue, Oct 11, 2022, 2:07 PM AKDT
UTC: 2022-10-11 22:07:33 UTC
Depth: 44.2 km (27.4 mi), shallow
Epicenter: 53.158° N, 166.892° 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: 0.3% of gravity
Peak ground velocity: -2.3 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.

Fault motion and ground failure

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

Faulting: Reverse (thrust)
Moment magnitude: 4.7 Mwr
Nodal plane 1: Strike 61°, dip 69°, rake 89°
Nodal plane 2: Strike 245°, dip 21°, rake 93°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 2.0 km horizontally, 5.1 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 127°
Stations used: 75

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast83 kmSSW

Nearby

Within 100 km, magnitude 1.7 and up: 139 in the 60 days after this one and 46 in the 30 days before it.

After

The first 60 of 139.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000isur (also filed as ak022d21rnvq). Read Mon, Sep 28, 2026, 8:55 AM UTC.