Alaska earthquakes

M4.3 earthquake 64 km ESE of Adak, Alaska

A magnitude 4.3 earthquake struck 64 km ESE of Adak, Alaska on Thu, Aug 21, 1986, 3:24 AM HADT (12:24 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.6 90 km SW of Atka, 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
4.3 (mb), light
Local time
UTC
1986-08-21 12:24:31 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.689° N, 175.745° 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 1.5 and up: 13 in the 60 days after this one and 25 in the 30 days before it.

After

  1. 4.488 km SW of Atka, Alaska · 14638 days ago · 33 km deep · 40 km away
  2. 4.946 km SW of Adak, Alaska · 14625 days ago · 33 km deep · 94 km away
  3. 4.1108 km SE of Adak, Alaska · 14612 days ago · 33 km deep · 52 km away
  4. 4.199 km SW of Atka, Alaska · 14612 days ago · 33 km deep · 43 km away
  5. 5.0110 km SSW of Atka, Alaska · 14611 days ago · 33 km deep · 67 km away
  6. 5.445 km ESE of Adak, Alaska · 14609 days ago · 33 km deep · 19 km away
  7. 4.977 km SSE of Adak, Alaska · 14605 days ago · 33 km deep · 55 km away
  8. 5.225 km E of Adak, Alaska · 14604 days ago · 43 km deep · 40 km away
  9. 4.579 km SE of Adak, Alaska · 14604 days ago · 33 km deep · 33 km away
  10. 4.767 km SE of Adak, Alaska · 14603 days ago · 33 km deep · 21 km away
  11. 5.690 km SW of Atka, Alaska · 14592 days ago · 33 km deep · 32 km away
  12. 4.4136 km SE of Adak, Alaska · 14592 days ago · 33 km deep · 83 km away
  13. 4.697 km SSW of Atka, Alaska · 14590 days ago · 33 km deep · 76 km away

Before

  1. 4.237 km E of Adak, Alaska · 14652 days ago · 33 km deep · 29 km away
  2. 4.888 km SW of Atka, Alaska · 14657 days ago · 33 km deep · 39 km away
  3. 4.3Andreanof Islands, Aleutian Islands, Alaska · 14662 days ago · 33 km deep · 80 km away
  4. 4.780 km S of Adak, Alaska · 14667 days ago · 33 km deep · 89 km away
  5. 4.987 km S of Adak, Alaska · 14667 days ago · 33 km deep · 94 km away
  6. 4.784 km S of Adak, Alaska · 14668 days ago · 33 km deep · 93 km away
  7. 5.979 km S of Adak, Alaska · 14668 days ago · 33 km deep · 94 km away
  8. 4.795 km SSW of Atka, Alaska · 14668 days ago · 33 km deep · 75 km away
  9. 5.076 km SE of Adak, Alaska · 14669 days ago · 33 km deep · 45 km away
  10. 4.354 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 45 km away
  11. 4.986 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 65 km away
  12. 4.883 km SSE of Adak, Alaska · 14669 days ago · 33 km deep · 66 km away
  13. 4.4Andreanof Islands, Aleutian Islands, Alaska · 14673 days ago · 33 km deep · 51 km away
  14. 4.785 km SW of Atka, Alaska · 14673 days ago · 33 km deep · 38 km away
  15. 5.588 km WSW of Atka, Alaska · 14673 days ago · 33 km deep · 32 km away
  16. 4.844 km E of Adak, Alaska · 14674 days ago · 33 km deep · 26 km away
  17. 4.497 km SSE of Adak, Alaska · 14675 days ago · 33 km deep · 76 km away
  18. 4.793 km SSE of Adak, Alaska · 14676 days ago · 33 km deep · 60 km away
  19. 4.669 km ESE of Adak, Alaska · 14677 days ago · 33 km deep · 10 km away
  20. 5.683 km SSE of Adak, Alaska · 14677 days ago · 33 km deep · 56 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002xcw. Read Wed, Sep 30, 2026, 5:52 AM UTC.