Alaska earthquakes

M3.4 earthquake 116 km S of Unalaska, Alaska

A magnitude 3.4 earthquake struck 116 km S of Unalaska, Alaska on Sat, Jul 22, 2023, 4:55 AM AKDT (12:55 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M4.5 93 km S of Unalaska, Alaska. This one was a foreshock.

Unalaska forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Open the live map with earthquakes

The earthquake

Magnitude: 3.4 (mb), minor
Local time: Sat, Jul 22, 2023, 4:55 AM AKDT
UTC: 2023-07-22 12:55:08 UTC
Depth: 39.5 km (24.6 mi), shallow
Epicenter: 52.848° N, 166.861° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

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 6.1 km horizontally, 7.6 km in depth
Magnitude uncertainty: ±0.10
Depth from: From location
Station coverage gap: 127°
Stations used: 75

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast116 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 140 in the 60 days after this one and 74 in the 30 days before it.

After

The first 60 of 140.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000khmd (also filed as ak0239bxkgil). Read Tue, Sep 29, 2026, 2:42 PM UTC.