Alaska earthquakes

M3.0 earthquake 254 km WSW of Adak, Alaska

A magnitude 3.0 earthquake struck 254 km WSW of Adak, Alaska on Mon, Dec 21, 2020, 7:56 PM GMT+12 (07:56 UTC), 12 km (7 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.

Open the live map with earthquakes

The earthquake

Magnitude: 3.0 (ml), minor
Local time: Mon, Dec 21, 2020, 7:56 PM GMT+12
UTC: 2020-12-21 07:56:27 UTC
Depth: 11.6 km (7.2 mi), shallow
Epicenter: 51.062° N, 179.943° E
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 7.5 km horizontally, 9.0 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 336°, poorly surrounded by stations
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 44 in the 60 days after this one and 26 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 us6000d4au (also filed as ak020gcvtnay). Read Sun, Sep 27, 2026, 4:50 AM UTC.