Alaska earthquakes

M5.5 earthquake 18 km W of Adak, Alaska

A magnitude 5.5 earthquake struck 18 km W of Adak, Alaska on Fri, Jun 22, 1973, 7:26 PM GMT-10 (05:26 UTC), 62 km (39 mi) below the surface.

A larger quake followed: M5.8 65 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.5 (mb), moderate
Local time
UTC
1973-06-23 05:26:49 UTC
Depth
62.0 km (38.5 mi), shallow
Epicenter
51.875° N, 176.900° 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
77

Nearby

Within 100 km, magnitude 2.5 and up: 9 in the 60 days after this one and 0 in the 30 days before it.

After

  1. 5.138 km ENE of Adak, Alaska · 19434 days ago · 63 km deep · 56 km away
  2. 4.6104 km WSW of Adak, Alaska · 19409 days ago · 55 km deep · 88 km away
  3. 5.865 km S of Adak, Alaska · 19399 days ago · 47 km deep · 68 km away
  4. 5.263 km S of Adak, Alaska · 19399 days ago · 48 km deep · 66 km away
  5. 5.647 km S of Adak, Alaska · 19399 days ago · 62 km deep · 51 km away
  6. 4.037 km SSE of Adak, Alaska · 19399 days ago · 55 km deep · 49 km away
  7. 4.161 km SSE of Adak, Alaska · 19399 days ago · 47 km deep · 68 km away
  8. 4.661 km S of Adak, Alaska · 19399 days ago · 53 km deep · 64 km away
  9. 4.954 km S of Adak, Alaska · 19398 days ago · 51 km deep · 58 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00002be (also filed as ushis3239, iscgem759758). Read Sat, Sep 26, 2026, 10:48 AM UTC.