Alaska earthquakes

M4.0 earthquake 162 km S of False Pass, Alaska

A magnitude 4.0 earthquake struck 162 km S of False Pass, Alaska on Sat, Sep 19, 2020, 6:07 PM AKDT (02:07 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: Sat, Sep 19, 2020, 6:07 PM AKDT
UTC: 2020-09-20 02:07:42 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.397° N, 163.589° 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 II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.8 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.16
Depth from: Operator assigned
Station coverage gap: 166°
Stations used: 65

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: 71 in the 60 days after this one and 33 in the 30 days before it.

After

The first 60 of 71.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000bqcq (also filed as ak020c4n4396). Read Sun, Sep 27, 2026, 4:34 PM UTC.