Alaska earthquakes

M5.2 earthquake 165 km SE of Nikolski, Alaska

A magnitude 5.2 earthquake struck 165 km SE of Nikolski, Alaska on Sat, Dec 4, 2021, 4:01 PM AKST (01:01 UTC), 10 km (6 mi) below the surface.

Unalaska forecast More in Alaska

Map

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

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The earthquake

Magnitude: 5.2 (mb), moderate
Local time: Sat, Dec 4, 2021, 4:01 PM AKST
UTC: 2021-12-05 01:01:21 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.937° N, 167.066° W
Region: Alaska
Felt reports: 5
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: III, weak shaking
Peak ground acceleration: 0.2% of gravity
Peak ground velocity: -2.1 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

5 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.3 km horizontally, 1.5 km in depth
Magnitude uncertainty: ±0.03
Depth from: Operator assigned
Station coverage gap: 66°
Stations used: 134

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast218 kmS

Nearby

Within 100 km, magnitude 2.2 and up: 200 in the 60 days after this one and 0 in the 30 days before it.

After

The first 60 of 200.

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000g960 (also filed as ak021fknscf3). Read Thu, Sep 24, 2026, 6:15 AM UTC.