Alaska earthquakes

M3.3 earthquake 121 km WSW of Adak, Alaska

A magnitude 3.3 earthquake struck 121 km WSW of Adak, Alaska on Wed, Mar 29, 2023, 2:55 AM HADT (11:55 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.1 150 km SW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Wed, Mar 29, 2023, 2:55 AM HADT
UTC: 2023-03-29 11:55:50 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 51.327° N, 178.158° 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 3.1 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.09
Depth from: Operator assigned
Station coverage gap: 205°, poorly surrounded by stations
Stations used: 30

Nearby

Within 100 km, magnitude 1.5 and up: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of at least 201.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000k2nd (also filed as ak02341q67d4). Read Wed, Sep 30, 2026, 5:54 AM UTC.