Alaska earthquakes

M2.8 earthquake 79 km W of Atka, Alaska

A magnitude 2.8 earthquake struck 79 km W of Atka, Alaska on Sun, Oct 11, 2020, 12:27 AM HADT (09:27 UTC), 228 km (142 mi) below the surface.

A larger quake followed: M3.9 63 km ESE of Adak, 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: 2.8 (ml), micro
Local time: Sun, Oct 11, 2020, 12:27 AM HADT
UTC: 2020-10-11 09:27:56 UTC
Depth: 228.3 km (141.9 mi), intermediate-depth
Epicenter: 52.175° N, 175.366° 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 17.8 km horizontally, 6.3 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 181°, poorly surrounded by stations
Stations used: 19

Nearby

Within 100 km, magnitude 1.5 and up: 87 in the 60 days after this one and 69 in the 30 days before it.

After

The first 60 of 87.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c9ps (also filed as ak020d3hopw2). Read Mon, Sep 28, 2026, 12:56 AM UTC.