Alaska earthquakes

M2.5 earthquake 44 km S of Unalaska, Alaska

A magnitude 2.5 earthquake struck 44 km S of Unalaska, Alaska on Wed, Jan 4, 2023, 2:21 AM AKST (11:21 UTC), 92 km (57 mi) below the surface.

A larger quake followed: M3.9 89 km ENE of Nikolski, Alaska. This one was a foreshock.

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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
2.5 (ml), micro
Local time
UTC
2023-01-04 11:21:08 UTC
Depth
91.9 km (57.1 mi), intermediate-depth
Epicenter
53.478° N, 166.630° 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 12.2 km horizontally, 17.0 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
190°, poorly surrounded by stations
Stations used
42

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 154 in the 60 days after this one and 78 in the 30 days before it.

After

The first 60 of 154.

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000j5v2 (also filed as ak0236stoci). Read Tue, Sep 29, 2026, 2:41 AM UTC.