Alaska earthquakes

M5.5 earthquake 88 km WSW of Atka, Alaska

A magnitude 5.5 earthquake struck 88 km WSW of Atka, Alaska on Mon, Jul 28, 1986, 12:57 PM HADT (21:57 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude: 5.5 (mw), moderate
Local time: Mon, Jul 28, 1986, 12:57 PM HADT
UTC: 1986-07-28 21:57:13 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 51.776° N, 175.301° 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: 17 in the 60 days after this one and 27 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wn7 (also filed as gcmtb072886c, gcmt19860728215712, iscgem491937). Read Tue, Sep 22, 2026, 9:41 PM UTC.