Alaska earthquakes

M4.0 earthquake 155 km ESE of Akutan, Alaska

A magnitude 4.0 earthquake struck 155 km ESE of Akutan, Alaska on Sat, Aug 15, 2020, 12:38 AM AKDT (08:38 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.5 151 km S of False Pass, 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: 4.0 (mb), light
Local time: Sat, Aug 15, 2020, 12:38 AM AKDT
UTC: 2020-08-15 08:38:33 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.434° N, 163.739° 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 6.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: Operator assigned
Station coverage gap: 190°, poorly surrounded by stations
Stations used: 105

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast155 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 77 in the 60 days after this one and 75 in the 30 days before it.

After

The first 60 of 77.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bf44 (also filed as ak020ah7it5m). Read Sat, Sep 26, 2026, 5:53 PM UTC.