Alaska earthquakes

M3.9 earthquake 139 km SE of Atka, Alaska

A magnitude 3.9 earthquake struck 139 km SE of Atka, Alaska on Fri, Dec 29, 2023, 9:20 AM HAST (19:20 UTC), 41 km (25 mi) below the surface.

A larger quake followed: M4.1 155 km ESE of Atka, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.9 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Fri, Dec 29, 2023, 9:20 AM HAST
UTC: 2023-12-29 19:20:01 UTC
Depth: 40.6 km (25.2 mi), shallow
Epicenter: 51.449° N, 172.576° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.9	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.194 · 7 stations
3.0	ML, local (Richter)	Alaska Earthquake Center	Preliminary

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 4.3 km horizontally, 9.5 km in depth
Magnitude uncertainty: ±0.19
Depth from: From location
Station coverage gap: 151°
Stations used: 34

Nearby

Within 100 km, magnitude 1.5 and up: 33 in the 60 days after this one and 13 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 us6000m2qs (also filed as ak023gonij9i). Read Thu, Oct 1, 2026, 10:06 AM UTC.