Alaska earthquakes

M4.0 earthquake 163 km S of False Pass, Alaska

A magnitude 4.0 earthquake struck 163 km S of False Pass, Alaska on Wed, Oct 14, 2020, 8:33 AM AKDT (16:33 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.7 156 km SSE of Akutan, 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: Wed, Oct 14, 2020, 8:33 AM AKDT
UTC: 2020-10-14 16:33:59 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.390° N, 163.599° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.5 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 210°, poorly surrounded by stations
Stations used: 72

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast165 kmESE

Nearby

Within 100 km, magnitude 1.5 and up: 65 in the 60 days after this one and 31 in the 30 days before it.

After

The first 60 of 65.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c8az (also filed as ak020d8ki6c8). Read Thu, Sep 24, 2026, 1:38 PM UTC.