Alaska earthquakes

M4.2 earthquake 116 km WSW of Nikolski, Alaska

A magnitude 4.2 earthquake struck 116 km WSW of Nikolski, Alaska on Thu, Jan 28, 2021, 3:48 PM HAST (01:48 UTC), 44 km (27 mi) below the surface.

A larger quake followed: M4.3 127 km SSW of Nikolski, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.2 (mb), light
Local time: Thu, Jan 28, 2021, 3:48 PM HAST
UTC: 2021-01-29 01:48:51 UTC
Depth: 43.7 km (27.1 mi), shallow
Epicenter: 52.381° N, 170.326° 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 6.5 km horizontally, 7.3 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 175°
Stations used: 73

Nearby

Within 100 km, magnitude 1.5 and up: 37 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 us6000depn (also filed as ak0211bzgw9t). Read Thu, Sep 24, 2026, 4:08 AM UTC.