Alaska earthquakes

M2.5 earthquake 65 km SSW of Nikolski, Alaska

A magnitude 2.5 earthquake struck 65 km SSW of Nikolski, Alaska on Sun, Dec 19, 2021, 7:30 PM AKST (04:30 UTC), 28 km (17 mi) below the surface.

A larger quake followed: M6.6 53 km SE of Nikolski, Alaska. This one was a foreshock.

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Map

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
2021-12-20 04:30:23 UTC
Depth
28.1 km (17.5 mi), shallow
Epicenter
52.409° N, 169.288° 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 9.6 km horizontally, 9.7 km in depth
Magnitude uncertainty
±0.15
Depth from
From location
Station coverage gap
344°, poorly surrounded by stations
Stations used
15

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 17 in the 30 days before it.

After

The first 60 of at least 199.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000gg00 (also filed as ak021g9it2gh). Read Wed, Sep 30, 2026, 5:27 AM UTC.