Alaska earthquakes

M5.4 earthquake 72 km SSE of Atka, Alaska

A magnitude 5.4 earthquake struck 72 km SSE of Atka, Alaska on Mon, Aug 29, 1977, 10:59 AM GMT-10 (20:59 UTC), 25 km (16 mi) below the surface.

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The earthquake

Magnitude
5.4 (mb), moderate
Local time
UTC
1977-08-29 20:59:59 UTC
Depth
25.0 km (15.5 mi), shallow
Epicenter
51.563° N, 173.968° 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.

Stations used
246

Nearby

Within 100 km, magnitude 2.4 and up: 5 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 4.660 km SSE of Atka, Alaska · 17921 days ago · 37 km deep · 12 km away
  2. 4.861 km SSE of Atka, Alaska · 17921 days ago · 30 km deep · 11 km away
  3. 4.654 km SSE of Atka, Alaska · 17920 days ago · 42 km deep · 18 km away
  4. 5.495 km SSE of Atka, Alaska · 17920 days ago · 33 km deep · 24 km away
  5. 4.881 km SSE of Atka, Alaska · 17919 days ago · 43 km deep · 11 km away

Before

  1. 4.267 km WSW of Atka, Alaska · 17929 days ago · 33 km deep · 98 km away
  2. 4.278 km WSW of Atka, Alaska · 17932 days ago · 33 km deep · 89 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000qd1 (also filed as iscgem695259). Read Tue, Sep 22, 2026, 10:27 AM UTC.