Alaska earthquakes

M4.2 earthquake 66 km SSW of Atka, Alaska

A magnitude 4.2 earthquake struck 66 km SSW of Atka, Alaska on Mon, Mar 1, 2021, 6:32 AM HAST (16:32 UTC), 63 km (39 mi) below the surface.

A larger quake followed: M4.4 61 km WSW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 4.2 (mb), light
Local time: Mon, Mar 1, 2021, 6:32 AM HAST
UTC: 2021-03-01 16:32:02 UTC
Depth: 62.5 km (38.8 mi), shallow
Epicenter: 51.671° N, 174.647° 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 5.9 km horizontally, 5.6 km in depth
Magnitude uncertainty: ±0.08
Depth from: From location
Station coverage gap: 126°
Stations used: 65

Nearby

Within 100 km, magnitude 1.5 and up: 130 in the 60 days after this one and 58 in the 30 days before it.

After

The first 60 of 130.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000del5 (also filed as ak0212rhymlc, ak0212rhymk0). Read Thu, Sep 24, 2026, 8:05 AM UTC.