Alaska earthquakes

M3.4 earthquake 54 km SE of Adak, Alaska

A magnitude 3.4 earthquake struck 54 km SE of Adak, Alaska on Sat, Nov 27, 2021, 6:47 PM HAST (04:47 UTC), 36 km (22 mi) below the surface.

A larger quake followed: M4.3 107 km SSW 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: 3.4 (ml), minor
Local time: Sat, Nov 27, 2021, 6:47 PM HAST
UTC: 2021-11-28 04:47:51 UTC
Depth: 35.7 km (22.2 mi), shallow
Epicenter: 51.505° N, 176.106° 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 4.7 km horizontally, 15.9 km in depth
Magnitude uncertainty: ±0.13
Depth from: From location
Station coverage gap: 208°, poorly surrounded by stations
Stations used: 21

Nearby

Within 100 km, magnitude 1.5 and up: 155 in the 60 days after this one and 69 in the 30 days before it.

After

The first 60 of 155.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000g7uw (also filed as ak021f9534y5). Read Mon, Sep 28, 2026, 2:15 AM UTC.