Alaska earthquakes

M3.8 earthquake 289 km WSW of Adak, Alaska

A magnitude 3.8 earthquake struck 289 km WSW of Adak, Alaska on Tue, Dec 15, 2020, 8:22 PM GMT+12 (08:22 UTC), 29 km (18 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 15, 2020, 8:22 PM GMT+12
UTC: 2020-12-15 08:22:48 UTC
Depth: 29.5 km (18.3 mi), shallow
Epicenter: 50.980° N, 179.458° 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 5.7 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 180°
Stations used: 54

Nearby

Within 100 km, magnitude 1.5 and up: 33 in the 60 days after this one and 20 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 us7000crb7 (also filed as ak020g2yzve2). Read Tue, Sep 29, 2026, 7:14 PM UTC.