Alaska earthquakes

M4.3 earthquake 73 km SSE of Atka, Alaska

A magnitude 4.3 earthquake struck 73 km SSE of Atka, Alaska on Thu, Dec 9, 2021, 9:12 PM HAST (07:12 UTC), 43 km (27 mi) below the surface.

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The earthquake

Magnitude: 4.3 (mb), light
Local time: Thu, Dec 9, 2021, 9:12 PM HAST
UTC: 2021-12-10 07:12:48 UTC
Depth: 43.4 km (27.0 mi), shallow
Epicenter: 51.560° N, 173.920° 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, 7.8 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 190°, poorly surrounded by stations
Stations used: 76

Nearby

Within 100 km, magnitude 1.5 and up: 61 in the 60 days after this one and 35 in the 30 days before it.

After

The first 60 of 61.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000gb3s (also filed as ak021ft143lq). Read Thu, Sep 24, 2026, 5:31 AM UTC.