Alaska earthquakes

M5.6 earthquake 47 km S of Adak, Alaska

A magnitude 5.6 earthquake struck 47 km S of Adak, Alaska on Thu, Aug 16, 1973, 4:25 AM GMT-10 (14:25 UTC), 62 km (39 mi) below the surface.

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The earthquake

Magnitude
5.6 (mb), moderate
Local time
UTC
1973-08-16 14:25:34 UTC
Depth
62.0 km (38.5 mi), shallow
Epicenter
51.449° N, 176.626° 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
CONSTRAINED_BY_DEPTH_PHASES
Stations used
66

Nearby

Within 100 km, magnitude 2.5 and up: 5 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.037 km SSE of Adak, Alaska · 19395 days ago · 55 km deep · 22 km away
  2. 4.161 km SSE of Adak, Alaska · 19395 days ago · 47 km deep · 18 km away
  3. 4.661 km S of Adak, Alaska · 19395 days ago · 53 km deep · 14 km away
  4. 4.954 km S of Adak, Alaska · 19394 days ago · 51 km deep · 7 km away
  5. 4.779 km SE of Adak, Alaska · 19385 days ago · 40 km deep · 50 km away

Before

  1. 5.263 km S of Adak, Alaska · 19395 days ago · 48 km deep · 17 km away
  2. 5.865 km S of Adak, Alaska · 19395 days ago · 47 km deep · 18 km away
  3. 4.6104 km WSW of Adak, Alaska · 19405 days ago · 55 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000033g (also filed as ushis3246). Read Tue, Sep 22, 2026, 5:16 PM UTC.