Alaska earthquakes

M3.9 earthquake 45 km SE of Atka, Alaska

A magnitude 3.9 earthquake struck 45 km SE of Atka, Alaska on Sun, Oct 11, 2020, 11:05 PM HADT (08:05 UTC), 20 km (13 mi) below the surface.

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The earthquake

Magnitude: 3.9 (mb), minor
Local time: Sun, Oct 11, 2020, 11:05 PM HADT
UTC: 2020-10-12 08:05:23 UTC
Depth: 20.1 km (12.5 mi), shallow
Epicenter: 51.924° N, 173.700° 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 6.8 km horizontally, 6.1 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 179°
Stations used: 72

Nearby

Within 100 km, magnitude 1.5 and up: 51 in the 60 days after this one and 53 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c7qg (also filed as ak020d54huqn). Read Wed, Sep 30, 2026, 5:01 PM UTC.