Alaska earthquakes

M2.9 earthquake 125 km SW of Nikolski, Alaska

A magnitude 2.9 earthquake struck 125 km SW of Nikolski, Alaska on Mon, Oct 25, 2021, 12:31 PM HADT (21:31 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M4.0 189 km ESE of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Mon, Oct 25, 2021, 12:31 PM HADT
UTC: 2021-10-25 21:31:55 UTC
Depth: 24.4 km (15.1 mi), shallow
Epicenter: 52.224° N, 170.294° 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, 11.4 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 220°, poorly surrounded by stations
Stations used: 17

Nearby

Within 100 km, magnitude 1.5 and up: 26 in the 60 days after this one and 13 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 us6000g9p6 (also filed as ak021dp6uabk). Read Mon, Sep 28, 2026, 8:09 PM UTC.