Alaska earthquakes

M4.1 earthquake 332 km WSW of Adak, Alaska

A magnitude 4.1 earthquake struck 332 km WSW of Adak, Alaska on Fri, Sep 30, 2022, 6:52 AM GMT+12 (18:52 UTC), 29 km (18 mi) below the surface.

A larger quake followed: M4.2 324 km ESE of Attu Station, Alaska. This one was a foreshock.

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 4.1 (mb), light
Local time: Fri, Sep 30, 2022, 6:52 AM GMT+12
UTC: 2022-09-29 18:52:14 UTC
Depth: 28.5 km (17.7 mi), shallow
Epicenter: 51.241° N, 178.686° E
Region: Alaska
Strongest shaking: I, not felt 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: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -4.1 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.7 km horizontally, 6.6 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 159°
Stations used: 61

Nearby

Within 100 km, magnitude 1.5 and up: 82 in the 60 days after this one and 45 in the 30 days before it.

After

The first 60 of 82.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ipf0 (also filed as ak022ci57dla). Read Wed, Sep 30, 2026, 10:35 AM UTC.