Alaska earthquakes

M4.0 earthquake 201 km WSW of Adak, Alaska

A magnitude 4.0 earthquake struck 201 km WSW of Adak, Alaska on Sat, Sep 9, 2023, 5:23 PM HADT (02:23 UTC), 46 km (28 mi) below the surface.

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The earthquake

Magnitude: 4.0 (mb), light
Local time: Sat, Sep 9, 2023, 5:23 PM HADT
UTC: 2023-09-10 02:23:01 UTC
Depth: 45.6 km (28.3 mi), shallow
Epicenter: 51.119° N, 179.267° 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 5.5 km horizontally, 7.7 km in depth
Magnitude uncertainty: ±0.14
Depth from: From location
Station coverage gap: 205°, poorly surrounded by stations
Stations used: 40

Nearby

Within 100 km, magnitude 1.5 and up: 155 in the 60 days after this one and 141 in the 30 days before it.

After

The first 60 of 155.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000kvrf (also filed as ak023bmgalot). Read Thu, Oct 1, 2026, 12:46 AM UTC.