Alaska earthquakes

M3.0 earthquake 294 km SW of Adak, Alaska

A magnitude 3.0 earthquake struck 294 km SW of Adak, Alaska on Thu, Feb 20, 2020, 3:47 PM GMT+12 (03:47 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.7 239 km WSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.0 (ml), minor
Local time: Thu, Feb 20, 2020, 3:47 PM GMT+12
UTC: 2020-02-20 03:47:09 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 50.405° N, 179.862° E
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 6.3 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.12
Depth from: Operator assigned
Station coverage gap: 243°, poorly surrounded by stations
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 51 in the 60 days after this one and 140 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60008966 (also filed as ak0202ceh3cj). Read Wed, Sep 30, 2026, 10:33 AM UTC.