Alaska earthquakes

M4.3 earthquake 121 km S of Unalaska, Alaska

A magnitude 4.3 earthquake struck 121 km S of Unalaska, Alaska on Sun, Feb 18, 2024, 10:04 PM AKST (07:04 UTC), 28 km (17 mi) below the surface.

A larger quake followed: M4.6 87 km SSW of Unalaska, Alaska. This one was a foreshock.

Unalaska 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: 4.3 (mb), light
Local time: Sun, Feb 18, 2024, 10:04 PM AKST
UTC: 2024-02-19 07:04:03 UTC
Depth: 27.9 km (17.3 mi), shallow
Epicenter: 52.788° N, 166.700° W
Region: Alaska
Strongest shaking: II, 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: II, weak 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?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.8 km horizontally, 3.7 km in depth
Magnitude uncertainty: ±0.05
Depth from: From location
Station coverage gap: 84°
Stations used: 141

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast121 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 119 in the 60 days after this one and 50 in the 30 days before it.

After

The first 60 of 119.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000m04f (also filed as ak0242at29hc). Read Mon, Sep 28, 2026, 1:18 PM UTC.