Alaska earthquakes

M4.9 earthquake 108 km SSW of False Pass, Alaska

A magnitude 4.9 earthquake struck 108 km SSW of False Pass, Alaska on Tue, Sep 12, 2023, 1:48 PM AKDT (21:48 UTC), 47 km (29 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: 4.9 (mb), light
Local time: Tue, Sep 12, 2023, 1:48 PM AKDT
UTC: 2023-09-12 21:48:57 UTC
Depth: 46.8 km (29.1 mi), shallow
Epicenter: 53.962° N, 164.079° 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: 0.4% of gravity
Peak ground velocity: -1.4 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.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.4 km horizontally, 4.9 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 119°
Stations used: 191

Nearest places

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

Akutan, AlaskaPopulation 1,040. Forecast112 kmE

Nearby

Within 100 km, magnitude 1.9 and up: 100 in the 60 days after this one and 68 in the 30 days before it.

After

The first 60 of 100.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000kvdm (also filed as ak023bq2u0fg). Read Mon, Sep 28, 2026, 9:11 AM UTC.