Alaska earthquakes

M3.9 earthquake 87 km NNE of Adak, Alaska

A magnitude 3.9 earthquake struck 87 km NNE of Adak, Alaska on Thu, Dec 28, 2023, 9:44 PM HAST (07:44 UTC), 216 km (134 mi) below the surface.

A larger quake followed: M4.4 74 km WNW 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: 3.9 (mb), minor
Local time: Thu, Dec 28, 2023, 9:44 PM HAST
UTC: 2023-12-29 07:44:27 UTC
Depth: 215.9 km (134.2 mi), intermediate-depth
Epicenter: 52.543° N, 175.958° 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 13.1 km horizontally, 7.1 km in depth
Magnitude uncertainty: ±0.16
Depth from: From location
Station coverage gap: 128°
Stations used: 41

Nearby

Within 100 km, magnitude 1.5 and up: 31 in the 60 days after this one and 27 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 us6000m2qc (also filed as ak023gogiifz). Read Thu, Oct 1, 2026, 12:45 AM UTC.