Alaska earthquakes

M3.1 earthquake 140 km W of Adak, Alaska

A magnitude 3.1 earthquake struck 140 km W of Adak, Alaska on Tue, Oct 13, 2020, 7:40 AM HADT (16:40 UTC), 153 km (95 mi) below the surface.

A larger quake followed: M4.9 182 km WSW 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: 3.1 (ml), minor
Local time: Tue, Oct 13, 2020, 7:40 AM HADT
UTC: 2020-10-13 16:40:38 UTC
Depth: 152.7 km (94.9 mi), intermediate-depth
Epicenter: 51.883° N, 178.672° 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 12.0 km horizontally, 5.1 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 128°
Stations used: 27

Nearby

Within 100 km, magnitude 1.5 and up: 105 in the 60 days after this one and 71 in the 30 days before it.

After

The first 60 of 105.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000c825 (also filed as ak020d6x06zm). Read Sun, Sep 27, 2026, 7:49 PM UTC.