Alaska earthquakes

M3.1 earthquake 63 km SSW of Adak, Alaska

A magnitude 3.1 earthquake struck 63 km SSW of Adak, Alaska on Tue, Feb 18, 2020, 10:41 AM HAST (20:41 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.0 71 km WNW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.1 (ml), minor
Local time: Tue, Feb 18, 2020, 10:41 AM HAST
UTC: 2020-02-18 20:41:49 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.322° N, 176.867° 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 4.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: Operator assigned
Station coverage gap: 212°, poorly surrounded by stations
Stations used: 26

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us600085jm (also filed as ak02029dhkk8). Read Wed, Sep 30, 2026, 9:39 AM UTC.