Alaska earthquakes

M3.6 earthquake 100 km E of Atka, Alaska

A magnitude 3.6 earthquake struck 100 km E of Atka, Alaska on Wed, Sep 30, 2020, 10:22 PM HADT (07:22 UTC), 151 km (94 mi) below the surface.

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

Map

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The earthquake

Magnitude: 3.6 (mb), minor
Local time: Wed, Sep 30, 2020, 10:22 PM HADT
UTC: 2020-10-01 07:22:14 UTC
Depth: 150.7 km (93.7 mi), intermediate-depth
Epicenter: 52.359° N, 172.753° 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 12.0 km horizontally, 6.7 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 132°
Stations used: 62

Nearby

Within 100 km, magnitude 1.5 and up: 27 in the 60 days after this one and 15 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 us6000c779 (also filed as ak020cmx398f). Read Mon, Sep 28, 2026, 5:05 AM UTC.