Alaska earthquakes

M4.0 earthquake 31 km SSE of Adak, Alaska

A magnitude 4.0 earthquake struck 31 km SSE of Adak, Alaska on Mon, Mar 2, 2020, 2:51 AM HAST (12:51 UTC), 48 km (30 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: Mon, Mar 2, 2020, 2:51 AM HAST
UTC: 2020-03-02 12:51:42 UTC
Depth: 48.5 km (30.1 mi), shallow
Epicenter: 51.624° N, 176.422° 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 5.5 km horizontally, 7.4 km in depth
Magnitude uncertainty: ±0.11
Depth from: From location
Station coverage gap: 141°
Stations used: 64

Nearby

Within 100 km, magnitude 1.5 and up: 198 in the 60 days after this one and 144 in the 30 days before it.

After

The first 60 of 198.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60008b4e (also filed as ak0202uqrqo8). Read Wed, Sep 30, 2026, 9:37 AM UTC.