Alaska earthquakes

M3.3 earthquake 288 km W of Adak, Alaska

A magnitude 3.3 earthquake struck 288 km W of Adak, Alaska on Mon, Dec 28, 2020, 10:23 AM GMT+12 (22:23 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M6.1 230 km WSW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Mon, Dec 28, 2020, 10:23 AM GMT+12
UTC: 2020-12-27 22:23:10 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.653° N, 179.203° 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 14.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 197°, poorly surrounded by stations
Stations used: 21

Nearby

Within 100 km, magnitude 1.5 and up: 34 in the 60 days after this one and 17 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 us6000d6j6 (also filed as ak020gn1s4he). Read Sun, Sep 27, 2026, 7:45 AM UTC.