Alaska earthquakes

M5.4 earthquake 79 km S of Adak, Alaska

A magnitude 5.4 earthquake struck 79 km S of Adak, Alaska on Wed, May 7, 1986, 4:18 PM HADT (01:18 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.5 80 km SSW of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.4 (mb), moderate
Local time
UTC
1986-05-08 01:18:00 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.161° N, 176.565° 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 2.4 and up: 138 in the 60 days after this one and 11 in the 30 days before it.

After

The first 60 of 138.

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002tp2. Read Wed, Sep 23, 2026, 7:01 PM UTC.