Alaska earthquakes

M3.0 earthquake 50 km ESE of Adak, Alaska

A magnitude 3.0 earthquake struck 50 km ESE of Adak, Alaska on Wed, Oct 20, 2021, 8:10 AM HADT (17:10 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M4.3 107 km SSW 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
3.0 (ml), minor
Local time
UTC
2021-10-20 17:10:38 UTC
Depth
3.1 km (1.9 mi), shallow
Epicenter
51.729° N, 175.936° W
Region
Alaska
Felt reports
1
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Stations used
21

Nearby

Within 100 km, magnitude 1.5 and up: 137 in the 60 days after this one and 45 in the 30 days before it.

After

  1. 3.693 km ESE of Adak, Alaska · 1800 days ago · 24 km deep · 43 km away
  2. 2.469 km WNW of Atka, Alaska · 1797 days ago · 120 km deep · 90 km away
  3. 1.854 km SW of Adak, Alaska · 1797 days ago · 43 km deep · 84 km away
  4. 2.081 km ENE of Adak, Alaska · 1796 days ago · 115 km deep · 47 km away
  5. 2.133 km ESE of Adak, Alaska · 1795 days ago · 62 km deep · 19 km away
  6. 3.563 km ESE of Adak, Alaska · 1795 days ago · 35 km deep · 17 km away
  7. 1.889 km SW of Atka, Alaska · 1795 days ago · 26 km deep · 66 km away
  8. 1.658 km SE of Adak, Alaska · 1794 days ago · 25 km deep · 23 km away
  9. 1.935 km E of Adak, Alaska · 1794 days ago · 125 km deep · 18 km away
  10. 1.843 km SSE of Adak, Alaska · 1794 days ago · 34 km deep · 35 km away
  11. 2.759 km SSE of Adak, Alaska · 1794 days ago · 34 km deep · 39 km away
  12. 2.974 km W of Atka, Alaska · 1793 days ago · 252 km deep · 62 km away
  13. 1.843 km SSE of Adak, Alaska · 1793 days ago · 37 km deep · 44 km away
  14. 1.740 km SSE of Adak, Alaska · 1793 days ago · 36 km deep · 37 km away
  15. 1.982 km ESE of Adak, Alaska · 1792 days ago · 48 km deep · 32 km away
  16. 3.747 km NE of Adak, Alaska · 1792 days ago · 188 km deep · 47 km away
  17. 2.657 km ESE of Adak, Alaska · 1792 days ago · 68 km deep · 8 km away
  18. 1.985 km ESE of Adak, Alaska · 1792 days ago · 44 km deep · 35 km away
  19. 2.062 km E of Adak, Alaska · 1792 days ago · 74 km deep · 28 km away
  20. 2.073 km SE of Adak, Alaska · 1792 days ago · 23 km deep · 32 km away
  21. 1.752 km SW of Adak, Alaska · 1791 days ago · 38 km deep · 82 km away
  22. 1.881 km ESE of Adak, Alaska · 1791 days ago · 55 km deep · 31 km away
  23. 2.949 km SSW of Adak, Alaska · 1791 days ago · 50 km deep · 68 km away
  24. 2.678 km E of Adak, Alaska · 1791 days ago · 75 km deep · 34 km away
  25. 1.634 km E of Adak, Alaska · 1790 days ago · 9 km deep · 25 km away
  26. 1.980 km SSW of Atka, Alaska · 1789 days ago · 29 km deep · 89 km away
  27. 2.790 km SSW of Atka, Alaska · 1789 days ago · 35 km deep · 96 km away
  28. 3.343 km ENE of Adak, Alaska · 1788 days ago · 180 km deep · 38 km away
  29. 2.228 km NNW of Adak, Alaska · 1788 days ago · 110 km deep · 73 km away
  30. 2.087 km S of Adak, Alaska · 1786 days ago · 16 km deep · 79 km away
  31. 2.675 km SSW of Atka, Alaska · 1785 days ago · 35 km deep · 81 km away
  32. 2.060 km ESE of Adak, Alaska · 1785 days ago · 39 km deep · 13 km away
  33. 2.5103 km ESE of Adak, Alaska · 1785 days ago · 35 km deep · 53 km away
  34. 1.560 km SSW of Adak, Alaska · 1784 days ago · 32 km deep · 84 km away
  35. 1.872 km SW of Atka, Alaska · 1784 days ago · 17 km deep · 75 km away
  36. 3.153 km SSE of Adak, Alaska · 1784 days ago · 35 km deep · 35 km away
  37. 1.665 km SSE of Adak, Alaska · 1784 days ago · 25 km deep · 49 km away
  38. 3.128 km ESE of Adak, Alaska · 1783 days ago · 71 km deep · 23 km away
  39. 1.853 km S of Adak, Alaska · 1782 days ago · 26 km deep · 59 km away
  40. 1.946 km SSE of Adak, Alaska · 1781 days ago · 40 km deep · 48 km away
  41. 1.757 km SSE of Adak, Alaska · 1781 days ago · 16 km deep · 49 km away
  42. 2.061 km SW of Atka, Alaska · 1781 days ago · 63 km deep · 76 km away
  43. 1.655 km SSE of Adak, Alaska · 1781 days ago · 26 km deep · 37 km away
  44. 2.451 km NE of Adak, Alaska · 1780 days ago · 172 km deep · 47 km away
  45. 1.623 km SSW of Adak, Alaska · 1780 days ago · 62 km deep · 56 km away
  46. 1.575 km SE of Adak, Alaska · 1780 days ago · 23 km deep · 33 km away
  47. 1.768 km S of Adak, Alaska · 1780 days ago · 22 km deep · 72 km away
  48. 1.861 km SE of Adak, Alaska · 1779 days ago · 5 km deep · 31 km away
  49. 1.770 km SE of Adak, Alaska · 1778 days ago · 22 km deep · 27 km away
  50. 2.050 km E of Adak, Alaska · 1778 days ago · 81 km deep · 9 km away
  51. 2.059 km SSW of Atka, Alaska · 1778 days ago · 17 km deep · 95 km away
  52. 1.841 km W of Adak, Alaska · 1778 days ago · 90 km deep · 90 km away
  53. 2.965 km SE of Adak, Alaska · 1777 days ago · 35 km deep · 36 km away
  54. 1.866 km SSW of Adak, Alaska · 1776 days ago · 31 km deep · 85 km away
  55. 1.757 km WSW of Atka, Alaska · 1776 days ago · 75 km deep · 73 km away
  56. 2.276 km NE of Adak, Alaska · 1776 days ago · 214 km deep · 63 km away
  57. 2.034 km WSW of Atka, Alaska · 1776 days ago · 88 km deep · 95 km away
  58. 1.976 km ESE of Adak, Alaska · 1776 days ago · 57 km deep · 26 km away
  59. 1.745 km SW of Adak, Alaska · 1775 days ago · 47 km deep · 81 km away
  60. 1.851 km SSE of Adak, Alaska · 1775 days ago · 33 km deep · 41 km away

The first 60 of 137.

Before

  1. 2.885 km ESE of Adak, Alaska · 1805 days ago · 52 km deep · 35 km away
  2. 1.652 km SW of Adak, Alaska · 1805 days ago · 39 km deep · 83 km away
  3. 2.560 km SE of Adak, Alaska · 1805 days ago · 36 km deep · 37 km away
  4. 1.890 km ESE of Adak, Alaska · 1805 days ago · 54 km deep · 40 km away
  5. 1.646 km S of Adak, Alaska · 1805 days ago · 30 km deep · 50 km away
  6. 3.134 km WSW of Atka, Alaska · 1806 days ago · 138 km deep · 96 km away
  7. 3.144 km SSE of Adak, Alaska · 1806 days ago · 33 km deep · 32 km away
  8. 2.855 km S of Adak, Alaska · 1807 days ago · 32 km deep · 68 km away
  9. 3.746 km S of Adak, Alaska · 1808 days ago · 35 km deep · 58 km away
  10. 2.961 km SSW of Adak, Alaska · 1809 days ago · 51 km deep · 78 km away
  11. 2.165 km E of Adak, Alaska · 1810 days ago · 29 km deep · 19 km away
  12. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1810 days ago · 23 km deep · 34 km away
  13. 3.863 km WSW of Atka, Alaska · 1810 days ago · 81 km deep · 68 km away
  14. 3.884 km NE of Adak, Alaska · 1811 days ago · 182 km deep · 76 km away
  15. 1.745 km W of Adak, Alaska · 1811 days ago · 92 km deep · 93 km away
  16. 1.966 km E of Adak, Alaska · 1811 days ago · 62 km deep · 24 km away
  17. 3.340 km SE of Adak, Alaska · 1812 days ago · 35 km deep · 24 km away
  18. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1813 days ago · 24 km deep · 89 km away
  19. 1.975 km E of Adak, Alaska · 1815 days ago · 29 km deep · 29 km away
  20. 1.841 km NE of Adak, Alaska · 1816 days ago · 3 km deep · 42 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021dgunbfi. Read Thu, Sep 24, 2026, 11:24 AM UTC.