Alaska earthquakes

M4.6 earthquake 87 km SSW of Unalaska, Alaska

A magnitude 4.6 earthquake struck 87 km SSW of Unalaska, Alaska on Tue, Apr 9, 2024, 5:55 PM AKDT (01:55 UTC), 35 km (22 mi) below the surface.

Unalaska forecast More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 4.6 (mwr), light
Local time: Tue, Apr 9, 2024, 5:55 PM AKDT
UTC: 2024-04-10 01:55:13 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 53.100° N, 166.797° 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: 0.6% of gravity
Peak ground velocity: -1.1 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 IV, light shaking.

Fault motion and ground failure

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

Faulting: Oblique normal
Moment magnitude: 4.6 Mwr
Nodal plane 1: Strike 181°, dip 62°, rake -45°
Nodal plane 2: Strike 296°, dip 52°, rake -143°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.7 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 58°
Stations used: 103

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast88 kmSSW

Nearby

Within 100 km, magnitude 1.6 and up: 117 in the 60 days after this one and 73 in the 30 days before it.

After

The first 60 of 117.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000mb3x (also filed as ak0244n27b1r). Read Mon, Sep 28, 2026, 4:35 PM UTC.