Alaska earthquakes

M3.9 earthquake 65 km NE of Adak, Alaska

A magnitude 3.9 earthquake struck 65 km NE of Adak, Alaska on Tue, Feb 25, 2020, 5:51 PM HAST (03:51 UTC), 150 km (93 mi) below the surface.

A larger quake followed: M4.0 31 km SSE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.9 (ml), minor
Local time: Tue, Feb 25, 2020, 5:51 PM HAST
UTC: 2020-02-26 03:51:07 UTC
Depth: 150.5 km (93.5 mi), intermediate-depth
Epicenter: 52.233° N, 175.883° 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 16.9 km horizontally, 13.2 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 177°
Stations used: 40

Nearby

Within 100 km, magnitude 1.5 and up: 112 in the 60 days after this one and 62 in the 30 days before it.

After

The first 60 of 112.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60008as9 (also filed as ak0202mbq14d). Read Wed, Sep 30, 2026, 5:31 PM UTC.