Alaska earthquakes

M4.0 earthquake 51 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 51 km WSW of Adak, Alaska on Sun, Mar 1, 2020, 11:26 PM HAST (09:26 UTC), 75 km (46 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: 4.0 (mb), light
Local time: Sun, Mar 1, 2020, 11:26 PM HAST
UTC: 2020-03-02 09:26:57 UTC
Depth: 74.6 km (46.3 mi), intermediate-depth
Epicenter: 51.655° N, 177.288° 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 7.0 km horizontally, 4.2 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 140°
Stations used: 83

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us600087ta (also filed as ak0202uou458). Read Wed, Sep 30, 2026, 4:08 PM UTC.