Alaska earthquakes

M3.9 earthquake 55 km SSE of Atka, Alaska

A magnitude 3.9 earthquake struck 55 km SSE of Atka, Alaska on Fri, May 21, 2021, 3:14 PM HADT (00:14 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.2 95 km SE of Atka, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude: 3.9 (mb), minor
Local time: Fri, May 21, 2021, 3:14 PM HADT
UTC: 2021-05-22 00:14:21 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.735° N, 173.896° 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 2.0 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.19
Depth from: Operator assigned
Station coverage gap: 285°, poorly surrounded by stations
Stations used: 23

Nearby

Within 100 km, magnitude 1.5 and up: 74 in the 60 days after this one and 27 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 us7000e59d (also filed as ak0216iuec0l). Read Thu, Sep 24, 2026, 9:19 AM UTC.