Alaska earthquakes

M5.2 earthquake 74 km SE of Unalaska, Alaska

A magnitude 5.2 earthquake struck 74 km SE of Unalaska, Alaska on Fri, Jul 18, 1986, 9:04 PM AKDT (05:04 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.0 51 km SW of Unalaska, Alaska. This one was a foreshock.

Unalaska forecast More in Alaska

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The earthquake

Magnitude: 5.2 (mw), moderate
Local time: Fri, Jul 18, 1986, 9:04 PM AKDT
UTC: 1986-07-19 05:04:08 UTC
Depth: 33.0 km (20.5 mi), shallow
Epicenter: 53.339° N, 165.859° 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

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Unalaska, AlaskaPopulation 4,491. Forecast74 kmSE

Nearby

Within 100 km, magnitude 2.2 and up: 17 in the 60 days after this one and 3 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002w5n (also filed as gcmtb071986b, ushis3964, gcmt19860719050408, iscgem491085). Read Wed, Sep 30, 2026, 12:06 AM UTC.