Alaska earthquakes

M3.1 earthquake 105 km WSW of Nikolski, Alaska

A magnitude 3.1 earthquake struck 105 km WSW of Nikolski, Alaska on Wed, Mar 17, 2021, 10:40 AM HADT (19:40 UTC), 137 km (85 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.

Open the live map with earthquakes

The earthquake

Magnitude: 3.1 (ml), minor
Local time: Wed, Mar 17, 2021, 10:40 AM HADT
UTC: 2021-03-17 19:40:50 UTC
Depth: 137.4 km (85.4 mi), intermediate-depth
Epicenter: 52.753° N, 170.392° 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 17.8 km horizontally, 10.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 173°
Stations used: 35

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast285 kmWSW

Nearby

Within 100 km, magnitude 1.5 and up: 28 in the 60 days after this one and 9 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 us6000dz6y (also filed as ak0213i0ean0). Read Mon, Sep 28, 2026, 2:50 PM UTC.