Alaska earthquakes

M3.8 earthquake 182 km ESE of Atka, Alaska

A magnitude 3.8 earthquake struck 182 km ESE of Atka, Alaska on Sat, Mar 13, 2021, 5:02 AM HAST (15:02 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.0 163 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.

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The earthquake

Magnitude: 3.8 (ml), minor
Local time: Sat, Mar 13, 2021, 5:02 AM HAST
UTC: 2021-03-13 15:02:12 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.710° N, 171.661° 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 4.5 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 213°, poorly surrounded by stations
Stations used: 39

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 12 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000dvr9 (also filed as ak0213bbmzob). Read Thu, Sep 24, 2026, 4:07 AM UTC.