Alaska earthquakes

M4.7 earthquake 85 km SW of Atka, Alaska

A magnitude 4.7 earthquake struck 85 km SW of Atka, Alaska on Mon, Jul 28, 1986, 2:29 PM HADT (23:29 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.8 83 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
4.7 (mb), light
Local time
UTC
1986-07-28 23:29:18 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.748° N, 175.203° 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 1.7 and up: 16 in the 60 days after this one and 27 in the 30 days before it.

After

  1. 4.4Andreanof Islands, Aleutian Islands, Alaska · 14666 days ago · 33 km deep · 19 km away
  2. 4.883 km SSE of Adak, Alaska · 14662 days ago · 33 km deep · 94 km away
  3. 4.986 km SSE of Adak, Alaska · 14662 days ago · 33 km deep · 92 km away
  4. 5.492 km S of Atka, Alaska · 14662 days ago · 33 km deep · 76 km away
  5. 4.889 km S of Atka, Alaska · 14662 days ago · 33 km deep · 77 km away
  6. 4.986 km S of Atka, Alaska · 14662 days ago · 33 km deep · 78 km away
  7. 4.354 km SSE of Adak, Alaska · 14662 days ago · 33 km deep · 81 km away
  8. 4.571 km S of Atka, Alaska · 14662 days ago · 33 km deep · 76 km away
  9. 5.076 km SE of Adak, Alaska · 14662 days ago · 33 km deep · 73 km away
  10. 4.795 km SSW of Atka, Alaska · 14661 days ago · 33 km deep · 49 km away
  11. 5.087 km S of Atka, Alaska · 14661 days ago · 33 km deep · 81 km away
  12. 4.3Andreanof Islands, Aleutian Islands, Alaska · 14654 days ago · 33 km deep · 56 km away
  13. 4.888 km SW of Atka, Alaska · 14649 days ago · 33 km deep · 8 km away
  14. 4.237 km E of Adak, Alaska · 14645 days ago · 33 km deep · 62 km away
  15. 4.364 km ESE of Adak, Alaska · 14642 days ago · 33 km deep · 38 km away
  16. 4.488 km SW of Atka, Alaska · 14631 days ago · 33 km deep · 9 km away

Before

  1. 5.588 km WSW of Atka, Alaska · 14666 days ago · 33 km deep · 7 km away
  2. 4.844 km E of Adak, Alaska · 14667 days ago · 33 km deep · 56 km away
  3. 5.4Andreanof Islands, Aleutian Islands, Alaska · 14667 days ago · 33 km deep · 78 km away
  4. 4.793 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 82 km away
  5. 4.669 km ESE of Adak, Alaska · 14669 days ago · 33 km deep · 31 km away
  6. 5.683 km SSE of Adak, Alaska · 14670 days ago · 33 km deep · 82 km away
  7. 5.876 km SSE of Adak, Alaska · 14670 days ago · 33 km deep · 87 km away
  8. 4.993 km SW of Atka, Alaska · 14670 days ago · 33 km deep · 9 km away
  9. 4.983 km SSE of Adak, Alaska · 14672 days ago · 33 km deep · 90 km away
  10. 5.257 km SSE of Adak, Alaska · 14672 days ago · 33 km deep · 77 km away
  11. 4.879 km SE of Adak, Alaska · 14673 days ago · 33 km deep · 49 km away
  12. 4.631 km SW of Atka, Alaska · 14674 days ago · 33 km deep · 53 km away
  13. 4.0101 km SW of Atka, Alaska · 14675 days ago · 33 km deep · 28 km away
  14. 4.888 km SSW of Atka, Alaska · 14677 days ago · 33 km deep · 55 km away
  15. 5.527 km E of Adak, Alaska · 14685 days ago · 50 km deep · 73 km away
  16. 4.5Andreanof Islands, Aleutian Islands, Alaska · 14686 days ago · 33 km deep · 39 km away
  17. 4.569 km SE of Adak, Alaska · 14687 days ago · 33 km deep · 70 km away
  18. 4.975 km ESE of Adak, Alaska · 14691 days ago · 33 km deep · 45 km away
  19. 5.063 km SE of Adak, Alaska · 14691 days ago · 33 km deep · 58 km away
  20. 4.484 km SSE of Adak, Alaska · 14695 days ago · 33 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wnc. Read Tue, Sep 22, 2026, 8:45 PM UTC.