Alaska earthquakes

M2.5 earthquake 56 km W of Nikolski, Alaska

A magnitude 2.5 earthquake struck 56 km W of Nikolski, Alaska on Thu, Nov 18, 2021, 4:30 AM AKST (13:30 UTC), 85 km (53 mi) below the surface.

A larger quake followed: M4.2 71 km SW of Nikolski, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
2.5 (ml), micro
Local time
UTC
2021-11-18 13:30:43 UTC
Depth
85.2 km (52.9 mi), intermediate-depth
Epicenter
52.941° N, 169.703° 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 5.8 km horizontally, 8.1 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
160°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 12 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000gdwy (also filed as ak021esqywn4). Read Wed, Sep 30, 2026, 10:38 AM UTC.