Alaska earthquakes

M4.1 earthquake 240 km WSW of Adak, Alaska

A magnitude 4.1 earthquake struck 240 km WSW of Adak, Alaska on Wed, Mar 4, 2020, 8:14 AM GMT-12 (20:14 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.2 243 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.1 (mb), light
Local time: Wed, Mar 4, 2020, 8:14 AM GMT-12
UTC: 2020-03-04 20:14:04 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.962° N, 179.765° 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 3.5 km horizontally, 1.8 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 141°
Stations used: 77

Nearby

Within 100 km, magnitude 1.5 and up: 92 in the 60 days after this one and 47 in the 30 days before it.

After

The first 60 of 92.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us600089nv (also filed as ak0202y6dw5c). Read Wed, Sep 30, 2026, 4:11 AM UTC.