Alaska earthquakes

M4.0 earthquake 33 km S of Atka, Alaska

A magnitude 4.0 earthquake struck 33 km S of Atka, Alaska on Sun, Mar 14, 2021, 8:13 PM HADT (05:13 UTC), 23 km (14 mi) below the surface.

A larger quake followed: M4.7 37 km SSW of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.0 (mb), light
Local time: Sun, Mar 14, 2021, 8:13 PM HADT
UTC: 2021-03-15 05:13:30 UTC
Depth: 23.0 km (14.3 mi), shallow
Epicenter: 51.897° N, 174.206° 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 5.1 km horizontally, 6.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 185°, poorly surrounded by stations
Stations used: 108

Nearby

Within 100 km, magnitude 1.5 and up: 102 in the 60 days after this one and 46 in the 30 days before it.

After

The first 60 of 102.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000djfd (also filed as ak0213egtpap). Read Thu, Sep 24, 2026, 8:30 AM UTC.