Alaska earthquakes

M3.9 earthquake 135 km SE of Perryville, Alaska

A magnitude 3.9 earthquake struck 135 km SE of Perryville, Alaska on Fri, Sep 3, 2021, 12:38 PM AKDT (20:38 UTC), 45 km (28 mi) below the surface.

A larger quake followed: M5.6 181 km SE of Chignik, 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
3.9 (ml), minor
Local time
UTC
2021-09-03 20:38:35 UTC
Depth
45.0 km (28.0 mi), shallow
Epicenter
54.981° N, 157.771° W
Region
Alaska
Strongest shaking
I, not felt shaking
Tsunami flag
No
Status
Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
I, not felt shaking
Peak ground acceleration
0.0% of gravity
Peak ground velocity
-4.1 cm/s
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

No one has reported feeling this quake to the USGS.

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
4.0 Mwr
Nodal plane 1
Strike 72°, dip 66°, rake 16°
Nodal plane 2
Strike 335°, dip 76°, rake 156°

How well it is located

Reviewed by a seismologist.

Stations used
134

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 86 in the 60 days after this one and 113 in the 30 days before it.

After

  1. 2.4138 km SE of Perryville, Alaska · 1845 days ago · 45 km deep · 4 km away
  2. 2.8140 km SE of Perryville, Alaska · 1845 days ago · 26 km deep · 15 km away
  3. 2.6153 km SSE of Chignik, Alaska · 1845 days ago · 22 km deep · 46 km away
  4. 2.5201 km SE of Perryville, Alaska · 1845 days ago · 33 km deep · 70 km away
  5. 2.2139 km SE of Perryville, Alaska · 1845 days ago · 48 km deep · 6 km away
  6. 3.3164 km SE of Chignik, Alaska · 1844 days ago · 6 km deep · 71 km away
  7. 2.9118 km SSE of Chignik, Alaska · 1844 days ago · 11 km deep · 49 km away
  8. 2.5116 km SE of Perryville, Alaska · 1844 days ago · 19 km deep · 23 km away
  9. 2.167 km SE of Perryville, Alaska · 1843 days ago · 12 km deep · 68 km away
  10. 2.5115 km SSE of Chignik, Alaska · 1842 days ago · 10 km deep · 55 km away
  11. 3.784 km ESE of Sand Point, Alaska · 1842 days ago · 35 km deep · 94 km away
  12. 2.071 km SE of Perryville, Alaska · 1842 days ago · 13 km deep · 64 km away
  13. 1.759 km SE of Perryville, Alaska · 1841 days ago · 54 km deep · 75 km away
  14. 2.0109 km SSE of Perryville, Alaska · 1841 days ago · 15 km deep · 33 km away
  15. 3.1139 km SE of Chignik, Alaska · 1841 days ago · 19 km deep · 51 km away · felt by 1
  16. 1.973 km SE of Perryville, Alaska · 1841 days ago · 9 km deep · 62 km away
  17. 1.757 km SE of Perryville, Alaska · 1841 days ago · 15 km deep · 77 km away
  18. 2.4205 km SE of Chignik, Alaska · 1840 days ago · 9 km deep · 89 km away
  19. 2.2118 km SSE of Perryville, Alaska · 1840 days ago · 28 km deep · 37 km away
  20. 2.8110 km SE of Chignik, Alaska · 1840 days ago · 13 km deep · 63 km away
  21. 3.3158 km SE of Perryville, Alaska · 1840 days ago · 21 km deep · 29 km away
  22. 2.7101 km SSE of Perryville, Alaska · 1839 days ago · 5 km deep · 49 km away
  23. 2.371 km SE of Chignik, Alaska · 1839 days ago · 47 km deep · 87 km away
  24. 2.038 km SSE of Perryville, Alaska · 1838 days ago · 42 km deep · 98 km away
  25. 3.3207 km SE of Perryville, Alaska · 1838 days ago · 25 km deep · 75 km away
  26. 2.8202 km SE of Perryville, Alaska · 1838 days ago · 16 km deep · 69 km away
  27. 2.6137 km SE of Chignik, Alaska · 1838 days ago · 21 km deep · 60 km away
  28. 2.8162 km SE of Perryville, Alaska · 1837 days ago · 6 km deep · 32 km away
  29. 2.359 km SE of Perryville, Alaska · 1836 days ago · 21 km deep · 76 km away
  30. 3.1118 km SE of Perryville, Alaska · 1835 days ago · 5 km deep · 20 km away
  31. 2.8149 km SSE of Chignik, Alaska · 1834 days ago · 12 km deep · 48 km away
  32. 2.8148 km SSE of Chignik, Alaska · 1834 days ago · 26 km deep · 46 km away
  33. 3.9197 km SE of Chignik, Alaska · 1833 days ago · 33 km deep · 94 km away
  34. 3.1131 km SE of Perryville, Alaska · 1832 days ago · 24 km deep · 12 km away
  35. 5.6181 km SE of Chignik, Alaska · 1832 days ago · 37 km deep · 82 km away · felt by 2
  36. 3.2191 km SE of Chignik, Alaska · 1832 days ago · 34 km deep · 90 km away
  37. 5.1200 km SE of Chignik, Alaska · 1832 days ago · 33 km deep · 94 km away · felt by 1 · tsunami flag
  38. 2.6103 km ESE of Sand Point, Alaska · 1832 days ago · 30 km deep · 83 km away
  39. 4.3131 km SSE of Perryville, Alaska · 1829 days ago · 17 km deep · 57 km away
  40. 3.0133 km SSE of Perryville, Alaska · 1829 days ago · 19 km deep · 61 km away
  41. 2.574 km SSE of Perryville, Alaska · 1828 days ago · 6 km deep · 67 km away
  42. 2.0Alaska Peninsula · 1827 days ago · 9 km deep · 74 km away
  43. 2.080 km ESE of Sand Point, Alaska · 1826 days ago · 9 km deep · 100 km away
  44. 2.9114 km SSE of Perryville, Alaska · 1826 days ago · 19 km deep · 54 km away
  45. 2.994 km S of Perryville, Alaska · 1826 days ago · 25 km deep · 79 km away
  46. 2.9144 km SE of Chignik, Alaska · 1825 days ago · 6 km deep · 57 km away
  47. 2.7144 km SE of Perryville, Alaska · 1825 days ago · 22 km deep · 15 km away
  48. 3.1194 km SE of Perryville, Alaska · 1824 days ago · 20 km deep · 64 km away
  49. 2.271 km SE of Perryville, Alaska · 1824 days ago · 14 km deep · 64 km away
  50. 2.890 km SE of Perryville, Alaska · 1823 days ago · 27 km deep · 45 km away
  51. 2.776 km S of Perryville, Alaska · 1822 days ago · 25 km deep · 95 km away
  52. 3.0204 km SE of Perryville, Alaska · 1822 days ago · 27 km deep · 70 km away
  53. 2.765 km SE of Perryville, Alaska · 1821 days ago · 5 km deep · 70 km away
  54. 3.0204 km SE of Perryville, Alaska · 1820 days ago · 1 km deep · 72 km away
  55. 3.3205 km SE of Perryville, Alaska · 1819 days ago · 9 km deep · 73 km away
  56. 2.460 km SE of Perryville, Alaska · 1819 days ago · 10 km deep · 75 km away
  57. 2.8152 km SE of Chignik, Alaska · 1814 days ago · 60 km deep · 73 km away
  58. 2.155 km SE of Perryville, Alaska · 1814 days ago · 14 km deep · 80 km away
  59. 2.667 km SE of Perryville, Alaska · 1813 days ago · 20 km deep · 69 km away
  60. 2.262 km SE of Perryville, Alaska · 1813 days ago · 22 km deep · 74 km away

The first 60 of 86.

Before

  1. 2.2108 km SSE of Perryville, Alaska · 1845 days ago · 15 km deep · 46 km away
  2. 3.3158 km SE of Chignik, Alaska · 1845 days ago · 39 km deep · 96 km away
  3. 2.5161 km SE of Chignik, Alaska · 1845 days ago · 18 km deep · 68 km away
  4. 3.7131 km SE of Perryville, Alaska · 1846 days ago · 11 km deep · 14 km away
  5. 2.077 km SSE of Perryville, Alaska · 1846 days ago · 20 km deep · 76 km away
  6. 2.0122 km SE of Chignik, Alaska · 1846 days ago · 27 km deep · 86 km away
  7. 1.769 km SE of Perryville, Alaska · 1846 days ago · 43 km deep · 66 km away
  8. 2.4144 km SSE of Perryville, Alaska · 1847 days ago · 25 km deep · 36 km away
  9. 2.6136 km SE of Chignik, Alaska · 1847 days ago · 16 km deep · 86 km away
  10. 2.3144 km SE of Perryville, Alaska · 1847 days ago · 40 km deep · 10 km away
  11. 3.0203 km SE of Perryville, Alaska · 1847 days ago · 47 km deep · 72 km away
  12. 2.8137 km SSE of Chignik, Alaska · 1847 days ago · 33 km deep · 38 km away
  13. 2.7146 km SE of Chignik, Alaska · 1848 days ago · 10 km deep · 83 km away
  14. 2.084 km ESE of Sand Point, Alaska · 1848 days ago · 8 km deep · 95 km away
  15. 2.489 km SSE of Perryville, Alaska · 1848 days ago · 13 km deep · 59 km away
  16. 3.6207 km SE of Perryville, Alaska · 1848 days ago · 25 km deep · 75 km away
  17. 1.961 km SE of Perryville, Alaska · 1848 days ago · 22 km deep · 75 km away
  18. 2.064 km SE of Perryville, Alaska · 1849 days ago · 15 km deep · 71 km away
  19. 2.1131 km SE of Perryville, Alaska · 1849 days ago · 13 km deep · 15 km away
  20. 1.985 km SSE of Perryville, Alaska · 1849 days ago · 26 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021bb6c9i0 (also filed as us7000f7n7). Read Tue, Sep 22, 2026, 5:16 PM UTC.