Alaska earthquakes

M1.9 earthquake 255 km W of Adak, Alaska

A magnitude 1.9 earthquake struck 255 km W of Adak, Alaska on Sat, Jul 17, 2021, 8:50 AM GMT+12 (20:50 UTC), 79 km (49 mi) below the surface.

A larger quake followed: M4.0 204 km W 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
1.9 (ml), micro
Local time
UTC
2021-07-16 20:50:55 UTC
Depth
78.6 km (48.8 mi), intermediate-depth
Epicenter
51.725° N, 179.668° E
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.

Stations used
21

Nearby

Within 100 km, magnitude 1.5 and up: 156 in the 60 days after this one and 49 in the 30 days before it.

After

  1. 2.4291 km WSW of Adak, Alaska · 1896 days ago · 38 km deep · 63 km away
  2. 2.6Rat Islands, Aleutian Islands, Alaska · 1895 days ago · 2 km deep · 92 km away
  3. 1.6Rat Islands, Aleutian Islands, Alaska · 1895 days ago · 7 km deep · 90 km away
  4. 2.5Rat Islands, Aleutian Islands, Alaska · 1895 days ago · 22 km deep · 73 km away
  5. 2.0Rat Islands, Aleutian Islands, Alaska · 1895 days ago · 30 km deep · 87 km away
  6. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1894 days ago · 83 km deep · 61 km away
  7. 1.8Rat Islands, Aleutian Islands, Alaska · 1894 days ago · 22 km deep · 72 km away
  8. 2.0237 km WSW of Adak, Alaska · 1894 days ago · 10 km deep · 78 km away
  9. 2.1Rat Islands, Aleutian Islands, Alaska · 1894 days ago · 43 km deep · 82 km away
  10. 2.0289 km W of Adak, Alaska · 1893 days ago · 52 km deep · 43 km away
  11. 2.5279 km W of Adak, Alaska · 1893 days ago · 56 km deep · 33 km away
  12. 2.3277 km WSW of Adak, Alaska · 1893 days ago · 52 km deep · 45 km away
  13. 1.6Rat Islands, Aleutian Islands, Alaska · 1893 days ago · 13 km deep · 83 km away
  14. 2.0198 km WSW of Adak, Alaska · 1892 days ago · 57 km deep · 67 km away
  15. 2.0269 km W of Adak, Alaska · 1891 days ago · 147 km deep · 31 km away
  16. 1.5Rat Islands, Aleutian Islands, Alaska · 1891 days ago · 17 km deep · 89 km away
  17. 1.6Rat Islands, Aleutian Islands, Alaska · 1890 days ago · 47 km deep · 71 km away
  18. 2.7265 km WSW of Adak, Alaska · 1890 days ago · 20 km deep · 66 km away
  19. 1.9281 km W of Adak, Alaska · 1890 days ago · 154 km deep · 46 km away
  20. 1.7216 km WSW of Adak, Alaska · 1890 days ago · 55 km deep · 55 km away
  21. 2.1244 km W of Adak, Alaska · 1888 days ago · 135 km deep · 23 km away
  22. 2.1252 km W of Adak, Alaska · 1887 days ago · 70 km deep · 11 km away
  23. 2.2256 km W of Adak, Alaska · 1887 days ago · 130 km deep · 19 km away
  24. 2.9211 km W of Adak, Alaska · 1887 days ago · 158 km deep · 50 km away
  25. 2.8282 km WSW of Adak, Alaska · 1885 days ago · 21 km deep · 96 km away
  26. 2.8266 km W of Adak, Alaska · 1885 days ago · 195 km deep · 38 km away
  27. 1.8237 km WSW of Adak, Alaska · 1883 days ago · 24 km deep · 56 km away
  28. 2.5251 km WSW of Adak, Alaska · 1883 days ago · 62 km deep · 41 km away
  29. 2.8265 km W of Adak, Alaska · 1883 days ago · 10 km deep · 15 km away
  30. 1.8Rat Islands, Aleutian Islands, Alaska · 1882 days ago · 59 km deep · 54 km away
  31. 2.7242 km WSW of Adak, Alaska · 1882 days ago · 35 km deep · 53 km away
  32. 1.7Rat Islands, Aleutian Islands, Alaska · 1882 days ago · 7 km deep · 92 km away
  33. 2.2268 km WSW of Adak, Alaska · 1882 days ago · 36 km deep · 58 km away
  34. 1.9245 km WSW of Adak, Alaska · 1882 days ago · 13 km deep · 44 km away
  35. 3.7Rat Islands, Aleutian Islands, Alaska · 1881 days ago · 116 km deep · 90 km away
  36. 2.8Rat Islands, Aleutian Islands, Alaska · 1881 days ago · 77 km deep · 17 km away
  37. 1.5Rat Islands, Aleutian Islands, Alaska · 1881 days ago · 21 km deep · 77 km away
  38. 2.7Rat Islands, Aleutian Islands, Alaska · 1880 days ago · 92 km deep · 76 km away
  39. 1.7255 km W of Adak, Alaska · 1879 days ago · 7 km deep · 23 km away
  40. 1.6291 km W of Adak, Alaska · 1878 days ago · 71 km deep · 36 km away
  41. 2.2Rat Islands, Aleutian Islands, Alaska · 1877 days ago · 62 km deep · 48 km away
  42. 3.3Rat Islands, Aleutian Islands, Alaska · 1877 days ago · 122 km deep · 99 km away
  43. 2.1Rat Islands, Aleutian Islands, Alaska · 1877 days ago · 87 km deep · 73 km away
  44. 1.9Rat Islands, Aleutian Islands, Alaska · 1876 days ago · 60 km deep · 64 km away
  45. 1.5236 km WSW of Adak, Alaska · 1876 days ago · 13 km deep · 70 km away
  46. 1.9Rat Islands, Aleutian Islands, Alaska · 1875 days ago · 60 km deep · 91 km away
  47. 2.9Rat Islands, Aleutian Islands, Alaska · 1875 days ago · 125 km deep · 91 km away
  48. 2.0204 km WSW of Adak, Alaska · 1874 days ago · 70 km deep · 60 km away
  49. 1.7261 km W of Adak, Alaska · 1874 days ago · 14 km deep · 19 km away
  50. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1874 days ago · 13 km deep · 55 km away
  51. 2.0Rat Islands, Aleutian Islands, Alaska · 1873 days ago · 97 km deep · 73 km away
  52. 1.5Rat Islands, Aleutian Islands, Alaska · 1872 days ago · 23 km deep · 45 km away
  53. 1.7227 km WSW of Adak, Alaska · 1872 days ago · 50 km deep · 51 km away
  54. 4.0204 km W of Adak, Alaska · 1872 days ago · 169 km deep · 61 km away
  55. 1.5234 km WSW of Adak, Alaska · 1872 days ago · 53 km deep · 37 km away
  56. 3.0270 km WSW of Adak, Alaska · 1872 days ago · 51 km deep · 44 km away
  57. 2.9294 km WSW of Adak, Alaska · 1871 days ago · 59 km deep · 48 km away
  58. 1.7184 km W of Adak, Alaska · 1871 days ago · 139 km deep · 71 km away
  59. 1.9245 km W of Adak, Alaska · 1870 days ago · 168 km deep · 40 km away
  60. 2.0230 km W of Adak, Alaska · 1870 days ago · 186 km deep · 59 km away

The first 60 of 156.

Before

  1. 2.3Rat Islands, Aleutian Islands, Alaska · 1897 days ago · 105 km deep · 92 km away
  2. 2.1Rat Islands, Aleutian Islands, Alaska · 1897 days ago · 69 km deep · 75 km away
  3. 1.5213 km W of Adak, Alaska · 1897 days ago · 110 km deep · 42 km away
  4. 1.7Rat Islands, Aleutian Islands, Alaska · 1898 days ago · 113 km deep · 82 km away
  5. 1.9Rat Islands, Aleutian Islands, Alaska · 1898 days ago · 96 km deep · 90 km away
  6. 1.7222 km WSW of Adak, Alaska · 1899 days ago · 58 km deep · 50 km away
  7. 3.4Rat Islands, Aleutian Islands, Alaska · 1899 days ago · 123 km deep · 93 km away
  8. 1.6175 km W of Adak, Alaska · 1899 days ago · 84 km deep · 81 km away
  9. 1.7Rat Islands, Aleutian Islands, Alaska · 1899 days ago · 58 km deep · 64 km away
  10. 1.6Rat Islands, Aleutian Islands, Alaska · 1900 days ago · 124 km deep · 95 km away
  11. 1.6Rat Islands, Aleutian Islands, Alaska · 1900 days ago · 116 km deep · 71 km away
  12. 3.2250 km WSW of Adak, Alaska · 1901 days ago · 26 km deep · 94 km away
  13. 1.5Rat Islands, Aleutian Islands, Alaska · 1901 days ago · 72 km deep · 54 km away
  14. 1.9241 km WSW of Adak, Alaska · 1901 days ago · 26 km deep · 82 km away
  15. 2.2Rat Islands, Aleutian Islands, Alaska · 1901 days ago · 8 km deep · 98 km away
  16. 2.2256 km W of Adak, Alaska · 1902 days ago · 141 km deep · 17 km away
  17. 1.8268 km WSW of Adak, Alaska · 1902 days ago · 62 km deep · 46 km away
  18. 2.0186 km WSW of Adak, Alaska · 1903 days ago · 13 km deep · 93 km away
  19. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1905 days ago · 22 km deep · 95 km away
  20. 2.7237 km W of Adak, Alaska · 1905 days ago · 13 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0219252vjo. Read Thu, Sep 24, 2026, 3:41 PM UTC.