Alaska earthquakes

M4.7 earthquake 156 km SSE of Akutan, Alaska

A magnitude 4.7 earthquake struck 156 km SSE of Akutan, Alaska on Tue, Oct 20, 2020, 7:35 PM AKDT (03:35 UTC), 10 km (6 mi) below the surface.

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: 4.7 (mwr), light
Local time: Tue, Oct 20, 2020, 7:35 PM AKDT
UTC: 2020-10-21 03:35:20 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 52.921° N, 164.570° 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.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 4.7 Mwr
Nodal plane 1: Strike 11°, dip 90°, rake 152°
Nodal plane 2: Strike 101°, dip 62°, rake 0°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.5 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 68°
Stations used: 140

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast157 kmSSE

Nearby

Within 100 km, magnitude 1.7 and up: 73 in the 60 days after this one and 17 in the 30 days before it.

After

The first 60 of 73.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000cahd (also filed as ak020djxj8vc, iscgem620220831). Read Mon, Sep 28, 2026, 8:22 AM UTC.