Alaska earthquakes

M5.4 earthquake 75 km SSE of Adak, Alaska

A magnitude 5.4 earthquake struck 75 km SSE of Adak, Alaska on Sun, Jun 29, 1986, 9:23 PM HADT (06:23 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.9 79 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 5.4 (mw), moderate
Local time: Sun, Jun 29, 1986, 9:23 PM HADT
UTC: 1986-06-30 06:23:46 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.259° N, 176.167° 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.

Depth from: OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 2.4 and up: 38 in the 60 days after this one and 32 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002vk3 (also filed as gcmtb063086a, gcmt19860630062346, iscgem494302). Read Tue, Sep 29, 2026, 1:19 AM UTC.