Alaska earthquakes

M3.4 earthquake 134 km W of Adak, Alaska

A magnitude 3.4 earthquake struck 134 km W of Adak, Alaska on Fri, Aug 11, 2023, 3:57 PM HADT (00:57 UTC), 94 km (58 mi) below the surface.

A larger quake followed: M4.7 149 km SW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.4 (ml), minor
Local time: Fri, Aug 11, 2023, 3:57 PM HADT
UTC: 2023-08-12 00:57:48 UTC
Depth: 93.8 km (58.3 mi), intermediate-depth
Epicenter: 51.696° N, 178.558° 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 5.0 km horizontally, 3.5 km in depth
Magnitude uncertainty: ±0.09
Depth from: From location
Station coverage gap: 143°
Stations used: 22

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 115 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 us7000kr2v (also filed as ak023aagq266). Read Wed, Sep 30, 2026, 10:30 PM UTC.