Alaska earthquakes

M3.3 earthquake 101 km NNE of Adak, Alaska

A magnitude 3.3 earthquake struck 101 km NNE of Adak, Alaska on Fri, Sep 15, 2023, 11:15 AM HADT (20:15 UTC), 200 km (124 mi) below the surface.

A larger quake followed: M6.4 78 km NNW of Adak, Alaska. This one was a foreshock.

Map

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The earthquake

Magnitude: 3.3 (ml), minor
Local time: Fri, Sep 15, 2023, 11:15 AM HADT
UTC: 2023-09-15 20:15:37 UTC
Depth: 199.5 km (124.0 mi), intermediate-depth
Epicenter: 52.655° N, 175.871° 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 10.5 km horizontally, 18.0 km in depth
Magnitude uncertainty: ±0.07
Depth from: From location
Station coverage gap: 152°
Stations used: 32

Nearby

Within 100 km, magnitude 1.5 and up: 43 in the 60 days after this one and 15 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000lbil (also filed as ak023bv0niw8). Read Wed, Sep 30, 2026, 8:37 PM UTC.