Alaska earthquakes

M4.2 earthquake 14 km SW of Adak, Alaska

A magnitude 4.2 earthquake struck 14 km SW of Adak, Alaska on Mon, Mar 7, 2022, 11:40 AM HAST (21:40 UTC), 75 km (47 mi) below the surface.

A larger quake followed: M4.7 43 km SSW of Adak, Alaska. This one was a foreshock.

Map

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

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The earthquake

Magnitude: 4.2 (mb), light
Local time: Mon, Mar 7, 2022, 11:40 AM HAST
UTC: 2022-03-07 21:40:52 UTC
Depth: 75.1 km (46.6 mi), intermediate-depth
Epicenter: 51.774° N, 176.769° W
Region: Alaska
Felt reports: 1
Strongest shaking: III, 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: III, weak shaking
Peak ground acceleration: 0.7% of gravity
Peak ground velocity: -2.1 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 8.2 km horizontally, 3.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 142°
Stations used: 94

Nearby

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and 111 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000h2w3 (also filed as ak02231i7ozg). Read Mon, Sep 28, 2026, 9:41 AM UTC.