Alaska earthquakes

M4.0 earthquake 340 km W of Adak, Alaska

A magnitude 4.0 earthquake struck 340 km W of Adak, Alaska on Fri, Nov 18, 2022, 10:40 AM GMT+12 (22:40 UTC), 170 km (106 mi) below the surface.

A larger quake followed: M6.3 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.0 (mb), light
Local time: Fri, Nov 18, 2022, 10:40 AM GMT+12
UTC: 2022-11-17 22:40:38 UTC
Depth: 170.0 km (105.6 mi), intermediate-depth
Epicenter: 52.237° N, 178.438° E
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

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 8.1 km horizontally, 5.6 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 52°
Stations used: 57

Nearby

Within 100 km, magnitude 1.5 and up: 106 in the 60 days after this one and 21 in the 30 days before it.

After

The first 60 of 106.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000irkb (also filed as ak022er8uled). Read Wed, Sep 30, 2026, 4:13 AM UTC.