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 Sat, Jun 3, 2023, 2:49 PM AKDT (22:49 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.8 113 km S of False Pass, Alaska. This one was a foreshock.

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: Sat, Jun 3, 2023, 2:49 PM AKDT
UTC: 2023-06-03 22:49:23 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.503° N, 163.291° W
Region: Alaska
Strongest shaking: I, not felt 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: I, not felt shaking
Peak ground acceleration: 0.0% of gravity
Peak ground velocity: -3.6 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: Reverse (thrust)
Moment magnitude: 4.6 Mwr
Nodal plane 1: Strike 74°, dip 69°, rake 82°
Nodal plane 2: Strike 276°, dip 23°, rake 110°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.2 km horizontally, 1.5 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 168°
Stations used: 141

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast177 kmESE

Nearby

Within 100 km, magnitude 1.6 and up: 146 in the 60 days after this one and 91 in the 30 days before it.

After

The first 60 of 146.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000k661 (also filed as ak0237325ji7). Read Mon, Sep 28, 2026, 11:08 PM UTC.