Alaska earthquakes

M2.9 earthquake 256 km WSW of Adak, Alaska

A magnitude 2.9 earthquake struck 256 km WSW of Adak, Alaska on Sat, Aug 21, 2021, 9:32 AM GMT+12 (21:32 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M6.1 187 km WSW of Adak, 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: 2.9 (ml), micro
Local time: Sat, Aug 21, 2021, 9:32 AM GMT+12
UTC: 2021-08-20 21:32:08 UTC
Depth: 25.1 km (15.6 mi), shallow
Epicenter: 51.258° N, 179.794° E
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 4.9 km horizontally, 7.1 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 218°, poorly surrounded by stations
Stations used: 18

Nearby

Within 100 km, magnitude 1.5 and up: 110 in the 60 days after this one and 74 in the 30 days before it.

After

The first 60 of 110.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000f6kp (also filed as ak021ao1dhq8). Read Thu, Sep 24, 2026, 12:48 PM UTC.