Alaska earthquakes

M3.5 earthquake 84 km WNW of Atka, Alaska

A magnitude 3.5 earthquake struck 84 km WNW of Atka, Alaska on Tue, Feb 4, 2020, 12:16 AM HAST (10:16 UTC), 233 km (145 mi) below the surface.

A larger quake followed: M4.2 53 km NNW 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: 3.5 (mb), minor
Local time: Tue, Feb 4, 2020, 12:16 AM HAST
UTC: 2020-02-04 10:16:01 UTC
Depth: 233.1 km (144.8 mi), intermediate-depth
Epicenter: 52.443° N, 175.370° 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 13.3 km horizontally, 9.2 km in depth
Magnitude uncertainty: ±0.19
Depth from: From location
Station coverage gap: 126°
Stations used: 33

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 35 in the 30 days before it.

After

The first 60 of 74.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70007plm (also filed as ak0201m1ux4g). Read Wed, Sep 30, 2026, 11:18 PM UTC.