Alaska earthquakes

M4.9 earthquake 59 km WSW of Unalaska, Alaska

A magnitude 4.9 earthquake struck 59 km WSW of Unalaska, Alaska on Tue, May 9, 2023, 6:10 AM AKDT (14:10 UTC), 92 km (57 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: 4.9 (mww), light
Local time: Tue, May 9, 2023, 6:10 AM AKDT
UTC: 2023-05-09 14:10:44 UTC
Depth: 92.3 km (57.3 mi), intermediate-depth
Epicenter: 53.709° N, 167.397° W
Region: Alaska
Felt reports: 6
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: 1.1% of gravity
Peak ground velocity: -1.1 cm/s
Map: Automatic

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

Did you feel it?

6 people reported to the USGS what they felt; the strongest reported shaking was VII, very strong shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Strike-slip
Moment magnitude: 4.9 Mww
Nodal plane 1: Strike 158°, dip 42°, rake -165°
Nodal plane 2: Strike 57°, dip 80°, rake -49°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 5.6 km horizontally, 2.9 km in depth
Magnitude uncertainty: ±0.06
Depth from: From location
Station coverage gap: 48°
Stations used: 161

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast60 kmWSW

Nearby

Within 100 km, magnitude 1.9 and up: 70 in the 60 days after this one and 42 in the 30 days before it.

After

The first 60 of 70.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000kamj (also filed as ak0235xkq2uy). Read Wed, Sep 30, 2026, 4:11 AM UTC.