Alaska earthquakes

M4.1 earthquake 118 km SSW of Nikolski, Alaska

A magnitude 4.1 earthquake struck 118 km SSW of Nikolski, Alaska on Sun, Sep 27, 2020, 12:17 AM AKDT (08:17 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M5.2 120 km SSW of Nikolski, 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.

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The earthquake

Magnitude: 4.1 (mb), light
Local time: Sun, Sep 27, 2020, 12:17 AM AKDT
UTC: 2020-09-27 08:17:49 UTC
Depth: 26.3 km (16.3 mi), shallow
Epicenter: 52.028° N, 169.755° 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 6.7 km horizontally, 6.3 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 185°, poorly surrounded by stations
Stations used: 84

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast298 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 24 in the 60 days after this one and 14 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c1vr (also filed as ak020cgbi9jf). Read Wed, Sep 30, 2026, 9:08 AM UTC.