Alaska earthquakes

M4.2 earthquake 70 km SW of Nikolski, Alaska

A magnitude 4.2 earthquake struck 70 km SW of Nikolski, Alaska on Sat, Dec 26, 2020, 7:45 PM AKST (04:45 UTC), 46 km (29 mi) below the surface.

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

Unalaska forecast More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude: 4.2 (mb), light
Local time: Sat, Dec 26, 2020, 7:45 PM AKST
UTC: 2020-12-27 04:45:26 UTC
Depth: 46.4 km (28.8 mi), shallow
Epicenter: 52.513° N, 169.642° W
Region: Alaska
Felt reports: 1
Tsunami flag: No
Status: Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 7.0 km horizontally, 5.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 141°
Stations used: 71

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast256 kmSW

Nearby

Within 100 km, magnitude 1.5 and up: 40 in the 60 days after this one and 98 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 us6000d3bt (also filed as ak020gmr72iw). Read Wed, Sep 30, 2026, 6:09 AM UTC.