Alaska earthquakes

M3.1 earthquake 75 km ENE of Adak, Alaska

A magnitude 3.1 earthquake struck 75 km ENE of Adak, Alaska on Sat, Oct 17, 2020, 1:39 AM HADT (10:39 UTC), 158 km (98 mi) below the surface.

A larger quake followed: M4.2 58 km SSE of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Sat, Oct 17, 2020, 1:39 AM HADT
UTC: 2020-10-17 10:39:16 UTC
Depth: 157.8 km (98.1 mi), intermediate-depth
Epicenter: 52.118° N, 175.607° 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 10.0 km horizontally, 6.1 km in depth
Magnitude uncertainty: ±0.12
Depth from: From location
Station coverage gap: 159°
Stations used: 24

Nearby

Within 100 km, magnitude 1.5 and up: 96 in the 60 days after this one and 74 in the 30 days before it.

After

The first 60 of 96.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000c7up (also filed as ak020ddfkq29). Read Mon, Sep 28, 2026, 7:37 AM UTC.