Alaska earthquakes

M3.9 earthquake 191 km WSW of Adak, Alaska

A magnitude 3.9 earthquake struck 191 km WSW of Adak, Alaska on Fri, Dec 25, 2020, 2:25 AM HAST (12:25 UTC), 83 km (52 mi) below the surface.

A larger quake followed: M6.1 230 km WSW of Adak, 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: 3.9 (mb), minor
Local time: Fri, Dec 25, 2020, 2:25 AM HAST
UTC: 2020-12-25 12:25:16 UTC
Depth: 82.9 km (51.5 mi), intermediate-depth
Epicenter: 51.378° N, 179.282° 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 13.5 km horizontally, 8.6 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 302°, poorly surrounded by stations
Stations used: 56

Nearby

Within 100 km, magnitude 1.5 and up: 110 in the 60 days after this one and 43 in the 30 days before it.

After

The first 60 of 110.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000d62z (also filed as ak020gjkrjde). Read Mon, Sep 28, 2026, 9:55 AM UTC.