Alaska earthquakes

M4.8 earthquake 157 km E of McCarthy, Alaska

A magnitude 4.8 earthquake struck 157 km E of McCarthy, Alaska on Sun, Aug 6, 2023, 12:22 PM AKDT (20:22 UTC), 3 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: 4.8 (mwr), light
Local time: Sun, Aug 6, 2023, 12:22 PM AKDT
UTC: 2023-08-06 20:22:04 UTC
Depth: 3.0 km (1.8 mi), shallow
Epicenter: 61.346° N, 139.974° W
Region: Alaska
Felt reports: 7
Strongest shaking: VI, strong 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: VI, strong shaking
Peak ground acceleration: 18.9% of gravity
Peak ground velocity: 2.0 cm/s
Map: Automatic

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

Did you feel it?

7 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

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: 4.8 Mwr
Nodal plane 1: Strike 140°, dip 54°, rake 117°
Nodal plane 2: Strike 279°, dip 44°, rake 58°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 1.1 km horizontally, 3.5 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 44°
Stations used: 148

Nearest places

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

Nearby

Within 100 km, magnitude 1.8 and up: 23 in the 60 days after this one and 5 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 us6000kybs (also filed as ak023a0v71tt, ak023a0v7bec). Read Tue, Sep 29, 2026, 4:31 PM UTC.