Alaska earthquakes

M5.9 earthquake 79 km S of Adak, Alaska

A magnitude 5.9 earthquake struck 79 km S of Adak, Alaska on Sun, Aug 3, 1986, 4:29 AM HADT (13:29 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude: 5.9 (mw), moderate
Local time: Sun, Aug 3, 1986, 4:29 AM HADT
UTC: 1986-08-03 13:29:10 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.164° N, 176.800° 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 2.9 and up: 9 in the 60 days after this one and 16 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wuj (also filed as gcmtb080386a, ushis3998, gcmt19860803132910, iscgem487861). Read Mon, Sep 28, 2026, 6:19 AM UTC.