Alaska earthquakes

M3.8 earthquake 260 km WSW of Adak, Alaska

A magnitude 3.8 earthquake struck 260 km WSW of Adak, Alaska on Tue, Dec 8, 2020, 8:38 AM GMT+12 (20:38 UTC), 5 km (3 mi) below the surface.

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

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The earthquake

Magnitude: 3.8 (mb), minor
Local time: Tue, Dec 8, 2020, 8:38 AM GMT+12
UTC: 2020-12-07 20:38:23 UTC
Depth: 5.4 km (3.3 mi), shallow
Epicenter: 51.238° N, 179.746° 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 5.0 km horizontally, 9.1 km in depth
Magnitude uncertainty: ±0.19
Depth from: From location
Station coverage gap: 222°, poorly surrounded by stations
Stations used: 28

Nearby

Within 100 km, magnitude 1.5 and up: 52 in the 60 days after this one and 15 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 us7000crd7 (also filed as ak020fpxxl11). Read Sun, Sep 27, 2026, 12:15 AM UTC.