Alaska earthquakes

M3.3 earthquake 259 km WSW of Adak, Alaska

A magnitude 3.3 earthquake struck 259 km WSW of Adak, Alaska on Wed, Jun 21, 2023, 9:54 PM GMT+12 (09:54 UTC), 31 km (19 mi) below the surface.

A larger quake followed: M4.0 229 km W of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Wed, Jun 21, 2023, 9:54 PM GMT+12
UTC: 2023-06-21 09:54:26 UTC
Depth: 30.8 km (19.1 mi), shallow
Epicenter: 51.448° N, 179.683° E
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 3.5 km horizontally, 10.9 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 170°
Stations used: 35

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 85 in the 30 days before it.

After

The first 60 of at least 199.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000kapt (also filed as ak0237wm481l). Read Wed, Sep 30, 2026, 6:32 PM UTC.