Alaska earthquakes

M3.6 earthquake 88 km W of Adak, Alaska

A magnitude 3.6 earthquake struck 88 km W of Adak, Alaska on Thu, Feb 27, 2020, 9:40 PM HAST (07:40 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M5.0 71 km WNW 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: 3.6 (mb), minor
Local time: Thu, Feb 27, 2020, 9:40 PM HAST
UTC: 2020-02-28 07:40:33 UTC
Depth: 10.6 km (6.6 mi), shallow
Epicenter: 51.899° N, 177.923° 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 2.0 km horizontally, 3.2 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 91°
Stations used: 62

Nearby

Within 100 km, magnitude 1.5 and up: 183 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 183.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000860v (also filed as av62141226, ak0202pp45me). Read Wed, Sep 30, 2026, 10:34 AM UTC.