Alaska earthquakes

M2.8 earthquake 29 km NNE of Atka, Alaska

A magnitude 2.8 earthquake struck 29 km NNE of Atka, Alaska on Thu, Aug 19, 2021, 2:51 PM HADT (23:51 UTC), 217 km (135 mi) below the surface.

A larger quake followed: M4.7 67 km ESE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.8 (ml), micro
Local time: Thu, Aug 19, 2021, 2:51 PM HADT
UTC: 2021-08-19 23:51:12 UTC
Depth: 217.3 km (135.0 mi), intermediate-depth
Epicenter: 52.446° N, 174.065° 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 21.4 km horizontally, 8.8 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 168°
Stations used: 34

Nearby

Within 100 km, magnitude 1.5 and up: 53 in the 60 days after this one and 47 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 us6000f8k7 (also filed as ak021amf553e). Read Thu, Sep 24, 2026, 1:39 PM UTC.