Alaska earthquakes

M4.2 earthquake 123 km SSW of Atka, Alaska

A magnitude 4.2 earthquake struck 123 km SSW of Atka, Alaska on Thu, Feb 13, 2020, 5:38 AM HAST (15:38 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.8 117 km SSW of Atka, 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: Thu, Feb 13, 2020, 5:38 AM HAST
UTC: 2020-02-13 15:38:43 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.182° N, 174.941° 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 4.3 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: Operator assigned
Station coverage gap: 184°, poorly surrounded by stations
Stations used: 102

Nearby

Within 100 km, magnitude 1.5 and up: 99 in the 60 days after this one and 52 in the 30 days before it.

After

The first 60 of 99.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70007ph1 (also filed as ak020210t0lh). Read Wed, Sep 30, 2026, 5:51 PM UTC.