Alaska earthquakes

M3.3 earthquake 52 km S of Unalaska, Alaska

A magnitude 3.3 earthquake struck 52 km S of Unalaska, Alaska on Thu, Apr 19, 2018, 3:32 PM AKDT (23:32 UTC), 38 km (24 mi) below the surface.

A larger quake followed: M4.5 96 km SSE of Akutan, 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: 3.3 (ml), minor
Local time: Thu, Apr 19, 2018, 3:32 PM AKDT
UTC: 2018-04-19 23:32:42 UTC
Depth: 38.4 km (23.8 mi), shallow
Epicenter: 53.404° N, 166.567° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

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 6.3 km horizontally, 27.4 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 192°, poorly surrounded by stations
Stations used: 52

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast52 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 122 in the 60 days after this one and 41 in the 30 days before it.

After

The first 60 of 122.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000drq8 (also filed as ak19245089, ak01850ngqv0). Read Wed, Sep 30, 2026, 11:15 PM UTC.