Alaska earthquakes

M3.1 earthquake 31 km ESE of Atka, Alaska

A magnitude 3.1 earthquake struck 31 km ESE of Atka, Alaska on Mon, Jun 22, 2020, 4:59 PM HADT (01:59 UTC), 120 km (74 mi) below the surface.

A larger quake followed: M4.1 19 km SSE 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: 3.1 (ml), minor
Local time: Mon, Jun 22, 2020, 4:59 PM HADT
UTC: 2020-06-23 01:59:36 UTC
Depth: 119.8 km (74.4 mi), intermediate-depth
Epicenter: 52.105° N, 173.770° 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 11.6 km horizontally, 11.3 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 194°, poorly surrounded by stations
Stations used: 44

Nearby

Within 100 km, magnitude 1.5 and up: 115 in the 60 days after this one and 38 in the 30 days before it.

After

The first 60 of 115.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000ack0 (also filed as ak02081fzw8h). Read Tue, Sep 29, 2026, 3:33 PM UTC.