Alaska earthquakes

M6.9 earthquake 67 km SW of Unalaska, Alaska

A magnitude 6.9 earthquake struck 67 km SW of Unalaska, Alaska on Thu, Feb 26, 1987, 11:31 PM AKST (08:31 UTC), 10 km (6 mi) below the surface.

Unalaska forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 6.9 (mw), strong
Local time: Thu, Feb 26, 1987, 11:31 PM AKST
UTC: 1987-02-27 08:31:54 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 53.470° N, 167.291° W
Region: Alaska
Strongest shaking: VI, strong shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: VI, strong shaking
Peak ground acceleration: 26.2% of gravity
Peak ground velocity: 3.4 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

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. Forecast67 kmSW

Nearby

Within 100 km, magnitude 2.5 and up: 44 in the 60 days after this one and 0 in the 30 days before it.

After

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00032u7 (also filed as choy19870227083154, gcmtc022787c, ushis4015, gcmt19870227083154, atlas19870227083156, iscgem475439). Read Tue, Sep 22, 2026, 9:36 AM UTC.