Alaska earthquakes

M4.8 earthquake 72 km WSW of Nikolski, Alaska

A magnitude 4.8 earthquake struck 72 km WSW of Nikolski, Alaska on Fri, Mar 26, 2021, 6:41 AM AKDT (14:41 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M4.9 128 km WSW 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: 4.8 (mb), light
Local time: Fri, Mar 26, 2021, 6:41 AM AKDT
UTC: 2021-03-26 14:41:19 UTC
Depth: 11.8 km (7.3 mi), shallow
Epicenter: 52.777° N, 169.911° 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 5.2 km horizontally, 2.8 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 88°
Stations used: 92

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast255 kmWSW

Nearby

Within 100 km, magnitude 1.8 and up: 29 in the 60 days after this one and 11 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 us6000dwqm (also filed as av91213356, ak0213wt9edw). Read Sun, Sep 27, 2026, 4:11 PM UTC.