Alaska earthquakes

M3.0 earthquake 108 km SE of Atka, Alaska

A magnitude 3.0 earthquake struck 108 km SE of Atka, Alaska on Tue, Oct 12, 2021, 2:37 PM HADT (23:37 UTC), 31 km (19 mi) below the surface.

A larger quake followed: M4.0 69 km SSE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.0 (ml), minor
Local time: Tue, Oct 12, 2021, 2:37 PM HADT
UTC: 2021-10-12 23:37:04 UTC
Depth: 30.5 km (19.0 mi), shallow
Epicenter: 51.571° N, 172.990° 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 3.0 km horizontally, 10.8 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 220°, poorly surrounded by stations
Stations used: 17

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 16 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 us6000g9up (also filed as ak021d3q2usm). Read Thu, Sep 24, 2026, 7:04 AM UTC.