Alaska earthquakes

M5.6 earthquake 90 km SW of Atka, Alaska

A magnitude 5.6 earthquake struck 90 km SW of Atka, Alaska on Fri, Oct 17, 1986, 4:02 PM HADT (01:02 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude: 5.6 (mw), moderate
Local time: Fri, Oct 17, 1986, 4:02 PM HADT
UTC: 1986-10-18 01:02:52 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.730° N, 175.285° 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: 12 in the 60 days after this one and 8 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002z1e (also filed as gcmtb101886a, gcmt19861018010252, iscgem484317). Read Tue, Sep 22, 2026, 9:31 PM UTC.