Alaska earthquakes

M4.6 earthquake 156 km ESE of Akutan, Alaska

A magnitude 4.6 earthquake struck 156 km ESE of Akutan, Alaska on Thu, Mar 21, 2024, 9:36 PM AKDT (05:36 UTC), 25 km (15 mi) below the surface.

A larger quake followed: M5.2 187 km SE of Akutan, Alaska. This one was a foreshock.

Akutan 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: 4.6 (mwr), light
Local time: Thu, Mar 21, 2024, 9:36 PM AKDT
UTC: 2024-03-22 05:36:30 UTC
Depth: 24.6 km (15.3 mi), shallow
Epicenter: 53.449° N, 163.695° W
Region: Alaska
Felt reports: 1
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: 0.1% of gravity
Peak ground velocity: -3.2 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.

Fault motion and ground failure

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

Faulting: Oblique reverse
Moment magnitude: 4.6 Mwr
Nodal plane 1: Strike 74°, dip 82°, rake 128°
Nodal plane 2: Strike 175°, dip 38°, rake 14°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.9 km horizontally, 5.7 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 171°
Stations used: 135

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast156 kmESE

Nearby

Within 100 km, magnitude 1.6 and up: 110 in the 60 days after this one and 49 in the 30 days before it.

After

The first 60 of 110.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000mkf7 (also filed as ak0243rp9eoe). Read Tue, Sep 29, 2026, 6:19 PM UTC.