Alaska earthquakes

M1.8 earthquake 42 km SSE of Adak, Alaska

A magnitude 1.8 earthquake struck 42 km SSE of Adak, Alaska on Thu, Sep 28, 2017, 11:32 PM HADT (08:32 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M4.6 68 km SW of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 1.8 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Thu, Sep 28, 2017, 11:32 PM HADT
UTC: 2017-09-29 08:32:25 UTC
Depth: 1.2 km (0.7 mi), shallow
Epicenter: 51.552° N, 176.291° 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.

Stations used: 10

Nearby

Within 100 km, magnitude 1.5 and up: 135 in the 60 days after this one and 46 in the 30 days before it.

After

The first 60 of 135.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak017chz4s17 (also filed as ak16989188). Read Fri, Oct 2, 2026, 11:54 AM UTC.