Alaska earthquakes

M3.4 earthquake 87 km SSW of Unalaska, Alaska

A magnitude 3.4 earthquake struck 87 km SSW of Unalaska, Alaska on Tue, Aug 18, 2026, 5:05 AM AKDT (13:05 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M4.0 92 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.

Open the live map with earthquakes

The earthquake

Magnitude: 3.4 (ml), minor
Local time: Tue, Aug 18, 2026, 5:05 AM AKDT
UTC: 2026-08-18 13:05:17 UTC
Depth: 26.8 km (16.6 mi), shallow
Epicenter: 53.117° N, 166.862° 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: 0.2% of gravity
Peak ground velocity: 0.0 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 4.1 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 212°, poorly surrounded by stations
Stations used: 38

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast87 kmSSW

Nearby

Within 100 km, magnitude 1.5 and up: 104 since this one and 74 in the 30 days before it.

After

The first 60 of 104.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000tlq8 (also filed as aka2026qhzeww). Read Tue, Sep 29, 2026, 8:40 PM UTC.