Alaska earthquakes

M5.3 earthquake 275 km WSW of Adak, Alaska

A magnitude 5.3 earthquake struck 275 km WSW of Adak, Alaska on Wed, Oct 31, 1984, 4:40 PM GMT+12 (04:40 UTC), 57 km (36 mi) below the surface.

A larger quake followed: M5.9 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.3 (mw), moderate
Local time
UTC
1984-10-31 04:40:05 UTC
Depth
57.3 km (35.6 mi), shallow
Epicenter
51.173° N, 179.559° 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 2.3 and up: 5 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 5.9Rat Islands, Aleutian Islands, Alaska · 15282 days ago · 39 km deep · 32 km away
  2. 4.8286 km WSW of Adak, Alaska · 15279 days ago · 33 km deep · 11 km away
  3. 4.5Rat Islands, Aleutian Islands, Alaska · 15279 days ago · 33 km deep · 35 km away
  4. 4.6Rat Islands, Aleutian Islands, Alaska · 15279 days ago · 33 km deep · 49 km away
  5. 4.5281 km WSW of Adak, Alaska · 15279 days ago · 33 km deep · 24 km away

Before

  1. 5.4282 km WSW of Adak, Alaska · 15302 days ago · 39 km deep · 7 km away
  2. 4.8203 km WSW of Adak, Alaska · 15321 days ago · 33 km deep · 82 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00028nt (also filed as gcmtb103184a, gcmt19841031044004, iscgem542446). Read Tue, Sep 22, 2026, 7:30 AM UTC.