Alaska earthquakes

M2.9 earthquake 178 km SE of Atka, Alaska

A magnitude 2.9 earthquake struck 178 km SE of Atka, Alaska on Sat, Aug 21, 2021, 9:04 AM HADT (18:04 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.0 167 km SE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 2.9 (ml), micro
Local time: Sat, Aug 21, 2021, 9:04 AM HADT
UTC: 2021-08-21 18:04:43 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 51.035° N, 172.432° 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 4.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 226°, poorly surrounded by stations
Stations used: 30

Nearby

Within 100 km, magnitude 1.5 and up: 18 in the 60 days after this one and 40 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 us6000f9g2 (also filed as ak021apmynfn). Read Thu, Sep 24, 2026, 7:10 AM UTC.