Alaska earthquakes

M4.6 earthquake 150 km S of False Pass, Alaska

A magnitude 4.6 earthquake struck 150 km S of False Pass, Alaska on Mon, Dec 25, 2023, 8:32 AM AKST (17:32 UTC), 23 km (14 mi) below the surface.

Akutan forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 4.6 (mwr), light
Local time: Mon, Dec 25, 2023, 8:32 AM AKST
UTC: 2023-12-25 17:32:35 UTC
Depth: 22.9 km (14.2 mi), shallow
Epicenter: 53.499° N, 163.453° W
Region: Alaska
Strongest shaking: II, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: II, weak shaking
Peak ground acceleration: 0.1% of gravity
Peak ground velocity: -2.6 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 4.6 Mwr
Nodal plane 1: Strike 145°, dip 44°, rake 6°
Nodal plane 2: Strike 50°, dip 86°, rake 134°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.0 km horizontally, 5.2 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 135°
Stations used: 81

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Akutan, AlaskaPopulation 1,040. Forecast168 kmESE

Nearby

Within 100 km, magnitude 1.6 and up: 79 in the 60 days after this one and 37 in the 30 days before it.

After

The first 60 of 79.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000lldz (also filed as ak023gi08wby). Read Mon, Sep 28, 2026, 6:40 AM UTC.