Alaska earthquakes

M3.3 earthquake 84 km W of Atka, Alaska

A magnitude 3.3 earthquake struck 84 km W of Atka, Alaska on Tue, Sep 22, 2020, 8:39 AM HADT (17:39 UTC), 144 km (90 mi) below the surface.

A larger quake followed: M5.3 76 km SW of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Tue, Sep 22, 2020, 8:39 AM HADT
UTC: 2020-09-22 17:39:59 UTC
Depth: 144.1 km (89.6 mi), intermediate-depth
Epicenter: 52.205° N, 175.439° 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 12.7 km horizontally, 6.4 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 157°
Stations used: 38

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 63 in the 30 days before it.

After

The first 60 of 101.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c6c2 (also filed as ak020c87b9am). Read Mon, Sep 28, 2026, 12:49 AM UTC.