Alaska earthquakes

M4.1 earthquake 119 km E of McCarthy, Alaska

A magnitude 4.1 earthquake struck 119 km E of McCarthy, Alaska on Thu, Feb 2, 2023, 5:53 PM AKST (02:53 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M4.7 Yukon, Canada. This one was a foreshock.

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Map

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

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The earthquake

Magnitude: 4.1 (mwr), light
Local time: Thu, Feb 2, 2023, 5:53 PM AKST
UTC: 2023-02-03 02:53:15 UTC
Depth: 4.0 km (2.5 mi), shallow
Epicenter: 61.518° N, 140.689° W
Region: Alaska
Strongest shaking: IV, light 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: IV, light shaking
Peak ground acceleration: 6.7% of gravity
Peak ground velocity: 0.8 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: Reverse (thrust)
Moment magnitude: 4.1 Mwr
Nodal plane 1: Strike 104°, dip 52°, rake 75°
Nodal plane 2: Strike 307°, dip 41°, rake 108°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.1 km horizontally, 1.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: From moment tensor inversion
Station coverage gap: 31°
Stations used: 61

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 55 in the 60 days after this one and 24 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 us6000jl3u (also filed as ak0231k9s22n). Read Wed, Sep 30, 2026, 1:08 AM UTC.