Alaska earthquakes

M4.0 earthquake 76 km SSW of Unalaska, Alaska

A magnitude 4.0 earthquake struck 76 km SSW of Unalaska, Alaska on Sat, Mar 14, 1987, 4:12 AM AKST (13:12 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.3 91 km SSW of Unalaska, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
4.0 (mb), light
Local time
UTC
1987-03-14 13:12:07 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
53.246° N, 166.990° 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
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Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 32 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00033a5. Read Tue, Sep 22, 2026, 3:08 PM UTC.