Alaska earthquakes

M2.8 earthquake 65 km SE of Nikolski, Alaska

A magnitude 2.8 earthquake struck 65 km SE of Nikolski, Alaska on Mon, Apr 19, 2021, 5:20 PM AKDT (01:20 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.2 34 km SSE 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: 2.8 (ml), micro
Local time: Mon, Apr 19, 2021, 5:20 PM AKDT
UTC: 2021-04-20 01:20:10 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 52.601° N, 168.064° 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 3.4 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 236°, poorly surrounded by stations
Stations used: 21

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast174 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 27 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 us7000e39e (also filed as ak02151xtx3h). Read Thu, Sep 24, 2026, 12:15 AM UTC.