Alaska earthquakes

M5.2 earthquake 54 km SSW of Adak, Alaska

A magnitude 5.2 earthquake struck 54 km SSW of Adak, Alaska on Fri, Oct 24, 1986, 2:00 AM HADT (11:00 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.9 45 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 5.2 (mw), moderate
Local time: Fri, Oct 24, 1986, 2:00 AM HADT
UTC: 1986-10-24 11:00:47 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.402° N, 176.859° 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 2.2 and up: 8 in the 60 days after this one and 5 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002z9z (also filed as gcmtb102486e, gcmt19861024110047, iscgem484854). Read Tue, Sep 22, 2026, 9:02 PM UTC.