Alaska earthquakes

M3.8 earthquake 90 km W of Adak, Alaska

A magnitude 3.8 earthquake struck 90 km W of Adak, Alaska on Fri, Jan 31, 2020, 3:32 AM HAST (13:32 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.0 71 km WNW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.8 (mb), minor
Local time: Fri, Jan 31, 2020, 3:32 AM HAST
UTC: 2020-01-31 13:32:40 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.824° N, 177.948° 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 6.3 km horizontally, 1.3 km in depth
Magnitude uncertainty: ±0.15
Depth from: Operator assigned
Station coverage gap: 100°
Stations used: 41

Nearby

Within 100 km, magnitude 1.5 and up: at least 200 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 200.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60007ltn (also filed as av62131266, ak0201fhlc6k). Read Wed, Sep 30, 2026, 10:20 PM UTC.