Alaska earthquakes

M2.9 earthquake 67 km ESE of Atka, Alaska

A magnitude 2.9 earthquake struck 67 km ESE of Atka, Alaska on Wed, Sep 23, 2020, 10:11 PM HADT (07:11 UTC), 71 km (44 mi) below the surface.

A larger quake followed: M4.3 130 km ENE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Wed, Sep 23, 2020, 10:11 PM HADT
UTC: 2020-09-24 07:11:32 UTC
Depth: 71.1 km (44.2 mi), intermediate-depth
Epicenter: 51.971° N, 173.293° 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 14.7 km horizontally, 29.5 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 200°, poorly surrounded by stations
Stations used: 35

Nearby

Within 100 km, magnitude 1.5 and up: 53 in the 60 days after this one and 24 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 us6000c5ug (also filed as ak020cbc9hi3). Read Mon, Sep 28, 2026, 3:38 PM UTC.