Alaska earthquakes

M4.2 earthquake 229 km W of Adak, Alaska

A magnitude 4.2 earthquake struck 229 km W of Adak, Alaska on Mon, Feb 3, 2020, 4:13 PM HAST (02:13 UTC), 97 km (60 mi) below the surface.

A larger quake followed: M5.7 239 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: 4.2 (mb), light
Local time: Mon, Feb 3, 2020, 4:13 PM HAST
UTC: 2020-02-04 02:13:41 UTC
Depth: 97.3 km (60.5 mi), intermediate-depth
Epicenter: 51.756° N, 179.956° 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 7.3 km horizontally, 2.4 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 117°
Stations used: 99

Nearby

Within 100 km, magnitude 1.5 and up: 107 in the 60 days after this one and 158 in the 30 days before it.

After

The first 60 of 107.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us60007p2k (also filed as ak0201lx2w14). Read Wed, Sep 30, 2026, 7:52 AM UTC.