Alaska earthquakes

M5.4 earthquake 299 km W of Adak, Alaska

A magnitude 5.4 earthquake struck 299 km W of Adak, Alaska on Thu, Dec 18, 1986, 3:46 PM GMT+12 (03:46 UTC), 68 km (42 mi) below the surface.

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The earthquake

Magnitude
5.4 (mb), moderate
Local time
UTC
1986-12-18 03:46:30 UTC
Depth
67.8 km (42.1 mi), shallow
Epicenter
51.708° N, 179.033° E
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
CONSTRAINED_BY_DEPTH_PHASES

Nearby

Within 100 km, magnitude 2.4 and up: 1 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.8Rat Islands, Aleutian Islands, Alaska · 14476 days ago · 33 km deep · 64 km away

Before

  1. 5.0Rat Islands, Aleutian Islands, Alaska · 14555 days ago · 78 km deep · 47 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00030yf. Read Wed, Sep 30, 2026, 4:47 PM UTC.