Alaska earthquakes

M3.1 earthquake 132 km E of Atka, Alaska

A magnitude 3.1 earthquake struck 132 km E of Atka, Alaska on Mon, Aug 17, 2020, 2:05 AM HADT (11:05 UTC), 99 km (62 mi) below the surface.

A larger quake followed: M3.8 183 km ESE of Atka, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Mon, Aug 17, 2020, 2:05 AM HADT
UTC: 2020-08-17 11:05:23 UTC
Depth: 99.4 km (61.8 mi), intermediate-depth
Epicenter: 52.140° N, 172.272° 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 11.3 km horizontally, 27.9 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 203°, poorly surrounded by stations
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 34 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 us7000bhp3 (also filed as ak020akk6pnq). Read Wed, Sep 30, 2026, 12:01 AM UTC.