Alaska earthquakes

M4.0 earthquake 100 km SW of Atka, Alaska

A magnitude 4.0 earthquake struck 100 km SW of Atka, Alaska on Sun, May 17, 2020, 10:09 AM HADT (19:09 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M4.1 19 km SSE 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: 4.0 (mb), light
Local time: Sun, May 17, 2020, 10:09 AM HADT
UTC: 2020-05-17 19:09:34 UTC
Depth: 39.6 km (24.6 mi), shallow
Epicenter: 51.543° N, 175.218° 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 5.1 km horizontally, 9.1 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 185°, poorly surrounded by stations
Stations used: 51

Nearby

Within 100 km, magnitude 1.5 and up: 151 in the 60 days after this one and 80 in the 30 days before it.

After

The first 60 of 151.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70009j2n (also filed as ak0206cjj4q4). Read Thu, Oct 1, 2026, 12:21 AM UTC.