Alaska earthquakes

M4.8 earthquake 79 km SE of Adak, Alaska

A magnitude 4.8 earthquake struck 79 km SE of Adak, Alaska on Mon, Jul 21, 1986, 5:00 PM HADT (02:00 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.2 57 km SSE of Adak, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.8 (mb), light
Local time
UTC
1986-07-22 02:00:06 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.445° N, 175.712° 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
OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 1.8 and up: 30 in the 60 days after this one and 25 in the 30 days before it.

After

  1. 5.257 km SSE of Adak, Alaska · 14672 days ago · 33 km deep · 33 km away
  2. 4.983 km SSE of Adak, Alaska · 14672 days ago · 33 km deep · 42 km away
  3. 4.952 km S of Adak, Alaska · 14671 days ago · 33 km deep · 68 km away
  4. 4.993 km SW of Atka, Alaska · 14670 days ago · 33 km deep · 40 km away
  5. 5.876 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 39 km away
  6. 5.683 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 33 km away
  7. 4.669 km ESE of Adak, Alaska · 14669 days ago · 33 km deep · 35 km away
  8. 4.793 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 35 km away
  9. 4.497 km SSE of Adak, Alaska · 14668 days ago · 33 km deep · 52 km away
  10. 4.844 km E of Adak, Alaska · 14667 days ago · 33 km deep · 51 km away
  11. 5.588 km WSW of Atka, Alaska · 14666 days ago · 33 km deep · 46 km away
  12. 4.785 km SW of Atka, Alaska · 14666 days ago · 33 km deep · 49 km away
  13. 4.4Andreanof Islands, Aleutian Islands, Alaska · 14666 days ago · 33 km deep · 66 km away
  14. 4.883 km SSE of Adak, Alaska · 14662 days ago · 33 km deep · 45 km away
  15. 4.986 km SSE of Adak, Alaska · 14662 days ago · 33 km deep · 43 km away
  16. 5.492 km S of Atka, Alaska · 14662 days ago · 33 km deep · 99 km away
  17. 4.354 km SSE of Adak, Alaska · 14662 days ago · 33 km deep · 38 km away
  18. 5.076 km SE of Adak, Alaska · 14662 days ago · 33 km deep · 24 km away
  19. 4.795 km SSW of Atka, Alaska · 14661 days ago · 33 km deep · 66 km away
  20. 5.979 km S of Adak, Alaska · 14660 days ago · 33 km deep · 82 km away
  21. 4.784 km S of Adak, Alaska · 14660 days ago · 33 km deep · 78 km away
  22. 4.987 km S of Adak, Alaska · 14660 days ago · 33 km deep · 80 km away
  23. 4.780 km S of Adak, Alaska · 14660 days ago · 33 km deep · 76 km away
  24. 4.3Andreanof Islands, Aleutian Islands, Alaska · 14654 days ago · 33 km deep · 69 km away
  25. 4.888 km SW of Atka, Alaska · 14649 days ago · 33 km deep · 45 km away
  26. 4.237 km E of Adak, Alaska · 14645 days ago · 33 km deep · 51 km away
  27. 4.364 km ESE of Adak, Alaska · 14642 days ago · 33 km deep · 27 km away
  28. 4.488 km SW of Atka, Alaska · 14631 days ago · 33 km deep · 45 km away
  29. 4.946 km SW of Adak, Alaska · 14618 days ago · 33 km deep · 96 km away
  30. 4.594 km SSW of Adak, Alaska · 14615 days ago · 33 km deep · 98 km away

Before

  1. 4.0101 km SW of Atka, Alaska · 14675 days ago · 33 km deep · 39 km away
  2. 4.888 km SSW of Atka, Alaska · 14677 days ago · 33 km deep · 78 km away
  3. 5.026 km SW of Adak, Alaska · 14685 days ago · 57 km deep · 84 km away
  4. 5.527 km E of Adak, Alaska · 14685 days ago · 50 km deep · 63 km away
  5. 4.5Andreanof Islands, Aleutian Islands, Alaska · 14686 days ago · 33 km deep · 39 km away
  6. 4.569 km SE of Adak, Alaska · 14687 days ago · 33 km deep · 23 km away
  7. 4.975 km ESE of Adak, Alaska · 14691 days ago · 33 km deep · 6 km away
  8. 5.063 km SE of Adak, Alaska · 14691 days ago · 33 km deep · 17 km away
  9. 4.761 km SW of Adak, Alaska · 14694 days ago · 33 km deep · 98 km away
  10. 4.484 km SSE of Adak, Alaska · 14695 days ago · 33 km deep · 43 km away
  11. 4.291 km SSE of Adak, Alaska · 14695 days ago · 33 km deep · 46 km away
  12. 4.093 km SSE of Adak, Alaska · 14695 days ago · 33 km deep · 48 km away
  13. 4.236 km S of Adak, Alaska · 14695 days ago · 33 km deep · 62 km away
  14. 5.475 km SSE of Adak, Alaska · 14695 days ago · 33 km deep · 38 km away
  15. 4.455 km SE of Adak, Alaska · 14695 days ago · 33 km deep · 25 km away
  16. 4.558 km S of Adak, Alaska · 14695 days ago · 33 km deep · 69 km away
  17. 4.853 km S of Adak, Alaska · 14695 days ago · 33 km deep · 68 km away
  18. 4.383 km SW of Atka, Alaska · 14701 days ago · 33 km deep · 50 km away
  19. 4.6101 km SE of Adak, Alaska · 14702 days ago · 33 km deep · 27 km away
  20. 4.4109 km SW of Atka, Alaska · 14702 days ago · 33 km deep · 35 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wbf. Read Tue, Sep 22, 2026, 7:42 PM UTC.