Alaska earthquakes

M3.5 earthquake 51 km W of Tonsina, Alaska

A magnitude 3.5 earthquake struck 51 km W of Tonsina, Alaska on Sun, Aug 1, 2021, 8:47 AM AKDT (16:47 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M3.6 14 km NW of Glennallen, Alaska. This one was a foreshock.

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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
3.5 (ml), minor
Local time
UTC
2021-08-01 16:47:38 UTC
Depth
25.8 km (16.0 mi), shallow
Epicenter
61.606° N, 146.136° W
Region
Alaska
Felt reports
2
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

2 people 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?

Fault motion and ground failure

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

Faulting
Strike-slip
Moment magnitude
3.6 Mwr
Nodal plane 1
Strike 314°, dip 40°, rake 175°
Nodal plane 2
Strike 48°, dip 87°, rake 50°

How well it is located

Reviewed by a seismologist.

Stations used
190

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 65 in the 60 days after this one and 30 in the 30 days before it.

After

  1. 2.939 km S of Glacier View, Alaska · 1879 days ago · 15 km deep · 81 km away · felt by 1
  2. 2.211 km N of Valdez, Alaska · 1879 days ago · 6 km deep · 43 km away · felt by 4
  3. 1.846 km NNW of Valdez, Alaska · 1877 days ago · 25 km deep · 29 km away
  4. 1.525 km WNW of Valdez, Alaska · 1876 days ago · 10 km deep · 51 km away
  5. 2.324 km NW of Valdez, Alaska · 1872 days ago · 15 km deep · 49 km away
  6. 1.530 km SSW of Glacier View, Alaska · 1872 days ago · 15 km deep · 90 km away
  7. 2.047 km N of Valdez, Alaska · 1871 days ago · 14 km deep · 19 km away
  8. 2.357 km SSE of Glacier View, Alaska · 1870 days ago · 10 km deep · 76 km away
  9. 2.322 km SW of Glacier View, Alaska · 1870 days ago · 24 km deep · 94 km away
  10. 1.948 km S of Glacier View, Alaska · 1869 days ago · 15 km deep · 79 km away
  11. 1.546 km SSE of Nelchina, Alaska · 1869 days ago · 29 km deep · 13 km away
  12. 2.042 km S of Glacier View, Alaska · 1868 days ago · 18 km deep · 90 km away
  13. 1.620 km SW of Glacier View, Alaska · 1865 days ago · 23 km deep · 95 km away
  14. 1.516 km NNE of Valdez, Alaska · 1864 days ago · 19 km deep · 38 km away
  15. 1.6Southern Alaska · 1864 days ago · 15 km deep · 50 km away
  16. 2.616 km SW of Valdez, Alaska · 1863 days ago · 11 km deep · 68 km away
  17. 1.949 km N of Valdez, Alaska · 1863 days ago · 24 km deep · 11 km away
  18. 2.012 km S of Tatitlek, Alaska · 1861 days ago · 19 km deep · 99 km away
  19. 1.942 km S of Nelchina, Alaska · 1860 days ago · 28 km deep · 29 km away
  20. 2.146 km SSE of Glacier View, Alaska · 1858 days ago · 6 km deep · 58 km away
  21. 1.548 km SSE of Nelchina, Alaska · 1857 days ago · 23 km deep · 10 km away
  22. 1.56 km SW of Eureka Roadhouse, Alaska · 1857 days ago · 27 km deep · 67 km away
  23. 2.448 km N of Valdez, Alaska · 1856 days ago · 14 km deep · 19 km away
  24. 1.815 km WNW of Eureka Roadhouse, Alaska · 1855 days ago · 33 km deep · 81 km away
  25. 1.848 km WNW of Valdez, Alaska · 1854 days ago · 20 km deep · 60 km away · felt by 1
  26. 2.043 km SSE of Glacier View, Alaska · 1854 days ago · 13 km deep · 72 km away
  27. 2.250 km S of Glacier View, Alaska · 1852 days ago · 20 km deep · 90 km away
  28. 1.527 km NW of Valdez, Alaska · 1851 days ago · 9 km deep · 44 km away
  29. 1.542 km SSE of Glacier View, Alaska · 1849 days ago · 19 km deep · 71 km away
  30. 1.52 km SSW of Valdez, Alaska · 1848 days ago · 11 km deep · 57 km away
  31. 1.849 km SSE of Eureka Roadhouse, Alaska · 1848 days ago · 8 km deep · 35 km away
  32. 2.031 km WNW of Valdez, Alaska · 1848 days ago · 8 km deep · 52 km away
  33. 1.617 km SSE of Glacier View, Alaska · 1847 days ago · 29 km deep · 72 km away
  34. 1.613 km NW of Valdez, Alaska · 1847 days ago · 7 km deep · 46 km away · felt by 1
  35. 1.543 km SSE of Nelchina, Alaska · 1846 days ago · 34 km deep · 14 km away
  36. 1.520 km S of Glacier View, Alaska · 1846 days ago · 20 km deep · 82 km away
  37. 2.531 km NW of Valdez, Alaska · 1846 days ago · 28 km deep · 51 km away
  38. 1.946 km N of Valdez, Alaska · 1844 days ago · 20 km deep · 16 km away
  39. 2.348 km N of Valdez, Alaska · 1843 days ago · 26 km deep · 12 km away
  40. 1.750 km N of Valdez, Alaska · 1843 days ago · 21 km deep · 11 km away
  41. 2.044 km WNW of Tatitlek, Alaska · 1842 days ago · 19 km deep · 94 km away
  42. 3.347 km SSE of Nelchina, Alaska · 1842 days ago · 13 km deep · 20 km away
  43. 1.751 km SSE of Glacier View, Alaska · 1841 days ago · 14 km deep · 74 km away
  44. 1.748 km N of Valdez, Alaska · 1841 days ago · 28 km deep · 17 km away
  45. 1.634 km SSE of Nelchina, Alaska · 1840 days ago · 27 km deep · 24 km away
  46. 1.519 km NNW of Valdez, Alaska · 1840 days ago · 27 km deep · 41 km away
  47. 2.048 km SSE of Nelchina, Alaska · 1839 days ago · 25 km deep · 12 km away
  48. 1.548 km N of Valdez, Alaska · 1839 days ago · 30 km deep · 10 km away
  49. 3.614 km NW of Glennallen, Alaska · 1837 days ago · 12 km deep · 71 km away · felt by 16
  50. 1.844 km NW of Tatitlek, Alaska · 1837 days ago · 5 km deep · 75 km away
  51. 1.613 km NNW of Glennallen, Alaska · 1837 days ago · 16 km deep · 72 km away
  52. 2.630 km NNE of Valdez, Alaska · 1835 days ago · 28 km deep · 23 km away
  53. 1.644 km NW of Tatitlek, Alaska · 1834 days ago · 10 km deep · 75 km away
  54. 1.525 km S of Eureka Roadhouse, Alaska · 1834 days ago · 30 km deep · 54 km away
  55. 1.710 km ENE of Valdez, Alaska · 1833 days ago · 1 km deep · 49 km away
  56. 1.58 km NNW of Glennallen, Alaska · 1831 days ago · 20 km deep · 70 km away
  57. 3.124 km NNW of Cordova, Alaska · 1830 days ago · 10 km deep · 96 km away · felt by 1
  58. 1.611 km NE of Silver Springs, Alaska · 1829 days ago · 53 km deep · 73 km away
  59. 1.649 km W of Tonsina, Alaska · 1828 days ago · 31 km deep · 3 km away
  60. 2.050 km NW of Valdez, Alaska · 1827 days ago · 20 km deep · 52 km away

The first 60 of 65.

Before

  1. 3.335 km N of Valdez, Alaska · 1884 days ago · 20 km deep · 26 km away · felt by 1
  2. 1.849 km WNW of Valdez, Alaska · 1885 days ago · 50 km deep · 73 km away
  3. 1.719 km WSW of Glacier View, Alaska · 1889 days ago · 15 km deep · 100 km away
  4. 1.538 km W of Valdez, Alaska · 1890 days ago · 15 km deep · 68 km away
  5. 1.736 km WNW of Valdez, Alaska · 1890 days ago · 14 km deep · 61 km away
  6. 2.556 km WNW of Valdez, Alaska · 1893 days ago · 10 km deep · 74 km away
  7. 1.640 km NNW of Valdez, Alaska · 1893 days ago · 15 km deep · 23 km away
  8. 2.938 km N of Valdez, Alaska · 1893 days ago · 13 km deep · 23 km away
  9. 1.548 km WNW of Valdez, Alaska · 1894 days ago · 6 km deep · 65 km away
  10. 3.043 km N of Valdez, Alaska · 1896 days ago · 21 km deep · 19 km away · felt by 1
  11. 2.023 km N of Glacier View, Alaska · 1896 days ago · 28 km deep · 94 km away
  12. 1.646 km N of Valdez, Alaska · 1899 days ago · 18 km deep · 21 km away
  13. 1.544 km S of Glacier View, Alaska · 1899 days ago · 5 km deep · 86 km away
  14. 1.840 km SSE of Nelchina, Alaska · 1900 days ago · 20 km deep · 22 km away
  15. 2.041 km NNW of Valdez, Alaska · 1903 days ago · 9 km deep · 29 km away
  16. 1.624 km S of Glacier View, Alaska · 1903 days ago · 26 km deep · 84 km away
  17. 1.619 km E of Tatitlek, Alaska · 1903 days ago · 10 km deep · 79 km away
  18. 1.5Southern Alaska · 1905 days ago · 13 km deep · 79 km away
  19. 1.614 km NNW of Glennallen, Alaska · 1905 days ago · 17 km deep · 72 km away
  20. 3.718 km ENE of Tatitlek, Alaska · 1906 days ago · 7 km deep · 79 km away · felt by 2

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak0219sja0eh (also filed as us6000f1ab). Read Fri, Sep 25, 2026, 11:06 PM UTC.