Alaska earthquakes

M5.4 earthquake 125 km SE of Adak, Alaska

A magnitude 5.4 earthquake struck 125 km SE of Adak, Alaska on Sat, Jun 21, 1986, 8:28 PM HADT (05:28 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.8 76 km SSE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 5.4 (mw), moderate
Local time: Sat, Jun 21, 1986, 8:28 PM HADT
UTC: 1986-06-22 05:28:52 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.210° N, 175.176° 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: 46 in the 60 days after this one and 42 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002v9r (also filed as gcmtb062286a, gcmt19860622052852, iscgem493715). Read Tue, Sep 22, 2026, 10:26 PM UTC.