Alaska earthquakes

M2.5 earthquake 75 km S of Unalaska, Alaska

A magnitude 2.5 earthquake struck 75 km S of Unalaska, Alaska on Thu, Feb 9, 2023, 11:40 PM AKST (08:40 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M3.8 142 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.

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The earthquake

Magnitude: 2.5 (ml), micro
Local time: Thu, Feb 9, 2023, 11:40 PM AKST
UTC: 2023-02-10 08:40:33 UTC
Depth: 35.0 km (21.7 mi), shallow
Epicenter: 53.207° N, 166.717° 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 3.2 km horizontally, 2.0 km in depth
Magnitude uncertainty: ±0.10
Depth from: Operator assigned
Station coverage gap: 239°, poorly surrounded by stations
Stations used: 16

Nearest places

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

Unalaska, AlaskaPopulation 4,491. Forecast75 kmS

Nearby

Within 100 km, magnitude 1.5 and up: 178 in the 60 days after this one and 76 in the 30 days before it.

After

The first 60 of 178.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000jpu3 (also filed as ak0231vy1cfp). Read Wed, Sep 30, 2026, 2:46 AM UTC.