Alaska earthquakes

M3.1 earthquake 28 km NW of Atka, Alaska

A magnitude 3.1 earthquake struck 28 km NW of Atka, Alaska on Thu, Aug 13, 2020, 11:08 AM HADT (20:08 UTC), 230 km (143 mi) below the surface.

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

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Thu, Aug 13, 2020, 11:08 AM HADT
UTC: 2020-08-13 20:08:48 UTC
Depth: 229.7 km (142.7 mi), intermediate-depth
Epicenter: 52.341° N, 174.546° 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 15.6 km horizontally, 2.1 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 129°
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 55 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 us7000bfd8 (also filed as ak020ae3exfe). Read Tue, Sep 29, 2026, 4:18 AM UTC.