Alaska earthquakes

M5.6 earthquake 83 km SSE of Adak, Alaska

A magnitude 5.6 earthquake struck 83 km SSE of Adak, Alaska on Fri, Jul 25, 1986, 12:04 AM HADT (09:04 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: 5.6 (ms), moderate
Local time: Fri, Jul 25, 1986, 12:04 AM HADT
UTC: 1986-07-25 09:04:16 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.223° N, 176.035° 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 2.5 and up: 23 in the 60 days after this one and 22 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wg8 (also filed as ushis3990, iscgem491657). Read Tue, Sep 22, 2026, 10:28 PM UTC.