Alaska earthquakes

M4.0 earthquake 159 km E of McCarthy, Alaska

A magnitude 4.0 earthquake struck 159 km E of McCarthy, Alaska on Tue, Sep 12, 2023, 10:46 PM AKDT (06:46 UTC), 4 km (2 mi) below the surface.

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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: 4.0 (mwr), light
Local time: Tue, Sep 12, 2023, 10:46 PM AKDT
UTC: 2023-09-13 06:46:43 UTC
Depth: 4.0 km (2.5 mi), shallow
Epicenter: 61.352° N, 139.944° W
Region: Alaska
Strongest shaking: III, 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: III, weak shaking
Peak ground acceleration: 1.7% of gravity
Peak ground velocity: -1.0 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: Oblique reverse
Moment magnitude: 4.0 Mwr
Nodal plane 1: Strike 136°, dip 61°, rake 129°
Nodal plane 2: Strike 257°, dip 47°, rake 42°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.7 km horizontally, 4.3 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 33°
Stations used: 77

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 18 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 us7000kvgv (also filed as ak023brhfecq). Read Tue, Sep 29, 2026, 5:36 PM UTC.