Alaska earthquakes

M4.6 earthquake 70 km E of Nikolski, Alaska

A magnitude 4.6 earthquake struck 70 km E of Nikolski, Alaska on Tue, Aug 17, 2021, 9:11 AM AKDT (17:11 UTC), 43 km (27 mi) below the surface.

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Map

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

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The earthquake

Magnitude
4.6 (mwr), light
Local time
UTC
2021-08-17 17:11:12 UTC
Depth
43.3 km (26.9 mi), shallow
Epicenter
52.948° N, 167.810° 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 II, weak shaking.

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

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting
Normal
Moment magnitude
4.6 Mwr
Nodal plane 1
Strike 92°, dip 5°, rake -65°
Nodal plane 2
Strike 247°, dip 86°, rake -92°

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 7.7 km horizontally, 6.3 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
135°
Stations used
81

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.6 and up: 67 in the 60 days after this one and 36 in the 30 days before it.

After

  1. 2.6100 km SSE of Nikolski, Alaska · 1863 days ago · 35 km deep · 88 km away
  2. 1.8151 km ESE of Nikolski, Alaska · 1861 days ago · 18 km deep · 87 km away
  3. 1.768 km E of Nikolski, Alaska · 1860 days ago · 30 km deep · 5 km away
  4. 1.954 km SW of Unalaska, Alaska · 1859 days ago · 13 km deep · 82 km away
  5. 2.756 km SE of Nikolski, Alaska · 1857 days ago · 35 km deep · 41 km away
  6. 1.840 km ESE of Nikolski, Alaska · 1857 days ago · 48 km deep · 37 km away
  7. 3.627 km WSW of Nikolski, Alaska · 1857 days ago · 80 km deep · 98 km away
  8. 4.251 km SE of Nikolski, Alaska · 1857 days ago · 49 km deep · 52 km away
  9. 1.757 km ESE of Nikolski, Alaska · 1856 days ago · 26 km deep · 21 km away
  10. 1.954 km S of Nikolski, Alaska · 1855 days ago · 27 km deep · 93 km away
  11. 1.857 km ESE of Nikolski, Alaska · 1853 days ago · 37 km deep · 37 km away
  12. 2.066 km SW of Unalaska, Alaska · 1852 days ago · 14 km deep · 69 km away
  13. 4.041 km ESE of Nikolski, Alaska · 1852 days ago · 53 km deep · 34 km away
  14. 1.789 km E of Nikolski, Alaska · 1852 days ago · 25 km deep · 21 km away
  15. 1.8135 km ESE of Nikolski, Alaska · 1851 days ago · 25 km deep · 76 km away
  16. 2.0152 km ESE of Nikolski, Alaska · 1851 days ago · 15 km deep · 89 km away
  17. 2.055 km SE of Nikolski, Alaska · 1850 days ago · 19 km deep · 51 km away
  18. 1.984 km E of Nikolski, Alaska · 1850 days ago · 53 km deep · 14 km away
  19. 1.688 km SSW of Unalaska, Alaska · 1850 days ago · 24 km deep · 55 km away
  20. 2.674 km SSW of Unalaska, Alaska · 1850 days ago · 55 km deep · 73 km away
  21. 1.741 km SSE of Nikolski, Alaska · 1849 days ago · 45 km deep · 69 km away
  22. 1.9140 km ESE of Nikolski, Alaska · 1849 days ago · 14 km deep · 77 km away
  23. 1.9136 km ESE of Nikolski, Alaska · 1848 days ago · 7 km deep · 70 km away
  24. 2.948 km SW of Unalaska, Alaska · 1848 days ago · 96 km deep · 85 km away
  25. 3.174 km NNE of Nikolski, Alaska · 1848 days ago · 133 km deep · 82 km away
  26. 2.9103 km ESE of Nikolski, Alaska · 1848 days ago · 25 km deep · 37 km away
  27. 2.863 km SSW of Unalaska, Alaska · 1846 days ago · 67 km deep · 74 km away
  28. 2.115 km NNE of Nikolski, Alaska · 1845 days ago · 100 km deep · 63 km away
  29. 3.6127 km S of Unalaska, Alaska · 1844 days ago · 7 km deep · 75 km away
  30. 2.184 km S of Unalaska, Alaska · 1844 days ago · 26 km deep · 72 km away
  31. 1.930 km SSW of Nikolski, Alaska · 1844 days ago · 19 km deep · 86 km away
  32. 1.8144 km S of Unalaska, Alaska · 1844 days ago · 26 km deep · 95 km away
  33. 1.7143 km S of Unalaska, Alaska · 1844 days ago · 21 km deep · 90 km away
  34. 1.6124 km S of Unalaska, Alaska · 1844 days ago · 2 km deep · 73 km away
  35. 2.071 km SE of Nikolski, Alaska · 1842 days ago · 25 km deep · 66 km away
  36. 3.220 km SSE of Nikolski, Alaska · 1840 days ago · 83 km deep · 62 km away
  37. 1.8102 km E of Nikolski, Alaska · 1840 days ago · 25 km deep · 32 km away
  38. 1.651 km SW of Unalaska, Alaska · 1833 days ago · 15 km deep · 83 km away
  39. 2.380 km SE of Nikolski, Alaska · 1833 days ago · 25 km deep · 59 km away
  40. 2.749 km S of Nikolski, Alaska · 1829 days ago · 13 km deep · 89 km away
  41. 2.652 km ESE of Nikolski, Alaska · 1829 days ago · 34 km deep · 34 km away
  42. 2.098 km E of Nikolski, Alaska · 1828 days ago · 26 km deep · 28 km away
  43. 2.684 km S of Unalaska, Alaska · 1827 days ago · 35 km deep · 73 km away
  44. 4.439 km ESE of Nikolski, Alaska · 1827 days ago · 39 km deep · 43 km away
  45. 1.944 km ESE of Nikolski, Alaska · 1826 days ago · 39 km deep · 42 km away
  46. 1.846 km SE of Nikolski, Alaska · 1826 days ago · 22 km deep · 42 km away
  47. 1.6Fox Islands, Aleutian Islands, Alaska · 1824 days ago · 23 km deep · 81 km away
  48. 3.2109 km SSW of Unalaska, Alaska · 1823 days ago · 29 km deep · 62 km away
  49. 2.156 km SW of Unalaska, Alaska · 1823 days ago · 89 km deep · 78 km away
  50. 3.085 km SSW of Unalaska, Alaska · 1823 days ago · 35 km deep · 68 km away
  51. 1.9107 km E of Nikolski, Alaska · 1821 days ago · 14 km deep · 37 km away
  52. 2.191 km SE of Nikolski, Alaska · 1817 days ago · 26 km deep · 71 km away
  53. 2.054 km SSW of Unalaska, Alaska · 1816 days ago · 71 km deep · 81 km away
  54. 2.5107 km ESE of Nikolski, Alaska · 1815 days ago · 23 km deep · 58 km away
  55. 2.984 km E of Nikolski, Alaska · 1814 days ago · 35 km deep · 20 km away
  56. 2.225 km W of Nikolski, Alaska · 1813 days ago · 86 km deep · 95 km away
  57. 1.8105 km ESE of Nikolski, Alaska · 1813 days ago · 17 km deep · 49 km away
  58. 4.177 km SSW of Unalaska, Alaska · 1811 days ago · 44 km deep · 69 km away
  59. 2.088 km S of Unalaska, Alaska · 1809 days ago · 41 km deep · 71 km away
  60. 3.091 km SW of Unalaska, Alaska · 1809 days ago · 35 km deep · 42 km away

The first 60 of 67.

Before

  1. 4.086 km E of Nikolski, Alaska · 1864 days ago · 35 km deep · 19 km away
  2. 1.962 km E of Nikolski, Alaska · 1864 days ago · 67 km deep · 8 km away
  3. 1.639 km SE of Nikolski, Alaska · 1866 days ago · 21 km deep · 51 km away
  4. 1.633 km ESE of Nikolski, Alaska · 1866 days ago · 29 km deep · 40 km away
  5. 1.786 km SSW of Unalaska, Alaska · 1867 days ago · 26 km deep · 68 km away
  6. 1.743 km SW of Unalaska, Alaska · 1867 days ago · 8 km deep · 90 km away
  7. 3.025 km S of Nikolski, Alaska · 1867 days ago · 36 km deep · 71 km away
  8. 3.5147 km ESE of Nikolski, Alaska · 1869 days ago · 18 km deep · 86 km away
  9. 1.730 km SSE of Nikolski, Alaska · 1870 days ago · 44 km deep · 63 km away
  10. 1.658 km SW of Unalaska, Alaska · 1871 days ago · 74 km deep · 76 km away
  11. 1.792 km E of Nikolski, Alaska · 1872 days ago · 26 km deep · 22 km away
  12. 2.0137 km S of Unalaska, Alaska · 1872 days ago · 9 km deep · 75 km away
  13. 2.0100 km E of Nikolski, Alaska · 1874 days ago · 26 km deep · 31 km away
  14. 3.444 km SE of Nikolski, Alaska · 1876 days ago · 41 km deep · 53 km away
  15. 1.789 km SSW of Unalaska, Alaska · 1876 days ago · 26 km deep · 62 km away
  16. 1.688 km SSW of Unalaska, Alaska · 1876 days ago · 26 km deep · 60 km away
  17. 3.588 km SSW of Unalaska, Alaska · 1876 days ago · 35 km deep · 60 km away
  18. 3.094 km SSW of Unalaska, Alaska · 1876 days ago · 35 km deep · 62 km away
  19. 1.673 km SW of Unalaska, Alaska · 1877 days ago · 70 km deep · 61 km away
  20. 2.0144 km ESE of Nikolski, Alaska · 1877 days ago · 25 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000f7mh. Read Thu, Sep 24, 2026, 10:58 AM UTC.