Alaska earthquakes

M3.5 earthquake 73 km S of Atka, Alaska

A magnitude 3.5 earthquake struck 73 km S of Atka, Alaska on Thu, Sep 21, 2023, 8:06 AM HADT (17:06 UTC), 44 km (27 mi) below the surface.

A larger quake followed: M4.4 9 km E 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
3.5 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2023-09-21 17:06:19 UTC
Depth
43.5 km (27.0 mi), shallow
Epicenter
51.545° N, 174.012° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.ScaleComputed byNotes
3.5mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.091 · 30 stations
3.2ML, local (Richter)Alaska Earthquake CenterPreliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 5.7 km horizontally, 7.9 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
151°
Stations used
58

Nearby

Within 100 km, magnitude 1.5 and up: 116 in the 60 days after this one and 94 in the 30 days before it.

After

  1. 2.225 km ESE of Atka, Alaska · 1105 days ago · 5 km deep · 61 km away
  2. 1.933 km ESE of Atka, Alaska · 1105 days ago · 12 km deep · 64 km away
  3. 2.5125 km S of Atka, Alaska · 1104 days ago · 10 km deep · 52 km away
  4. 3.043 km SE of Atka, Alaska · 1104 days ago · 10 km deep · 50 km away
  5. 2.799 km S of Atka, Alaska · 1103 days ago · 10 km deep · 31 km away
  6. 3.150 km ESE of Atka, Alaska · 1102 days ago · 14 km deep · 65 km away
  7. 3.244 km ESE of Atka, Alaska · 1102 days ago · 13 km deep · 56 km away
  8. 3.048 km ESE of Atka, Alaska · 1102 days ago · 10 km deep · 53 km away
  9. 1.651 km SSW of Atka, Alaska · 1101 days ago · 40 km deep · 41 km away
  10. 2.0109 km S of Atka, Alaska · 1101 days ago · 3 km deep · 38 km away
  11. 1.831 km ESE of Atka, Alaska · 1100 days ago · 13 km deep · 62 km away
  12. 1.652 km SSE of Atka, Alaska · 1100 days ago · 7 km deep · 21 km away
  13. 1.635 km ESE of Atka, Alaska · 1100 days ago · 6 km deep · 57 km away
  14. 2.3109 km SSE of Atka, Alaska · 1100 days ago · 16 km deep · 39 km away
  15. 3.0127 km SE of Atka, Alaska · 1099 days ago · 35 km deep · 94 km away
  16. 1.739 km ESE of Atka, Alaska · 1099 days ago · 9 km deep · 61 km away
  17. 2.589 km ESE of Atka, Alaska · 1099 days ago · 73 km deep · 87 km away
  18. 1.845 km E of Atka, Alaska · 1098 days ago · 16 km deep · 72 km away
  19. 1.732 km ESE of Atka, Alaska · 1098 days ago · 11 km deep · 65 km away
  20. 2.939 km SSW of Atka, Alaska · 1098 days ago · 62 km deep · 44 km away
  21. 2.272 km WSW of Atka, Alaska · 1097 days ago · 60 km deep · 89 km away
  22. 2.183 km WSW of Atka, Alaska · 1096 days ago · 75 km deep · 98 km away
  23. 2.979 km SSE of Atka, Alaska · 1096 days ago · 35 km deep · 11 km away
  24. 2.574 km S of Atka, Alaska · 1096 days ago · 35 km deep · 9 km away
  25. 1.616 km WNW of Atka, Alaska · 1095 days ago · 10 km deep · 84 km away
  26. 2.131 km ESE of Atka, Alaska · 1095 days ago · 8 km deep · 59 km away
  27. 2.742 km W of Atka, Alaska · 1095 days ago · 10 km deep · 89 km away
  28. 1.940 km ESE of Atka, Alaska · 1095 days ago · 10 km deep · 65 km away
  29. 2.3100 km SSE of Atka, Alaska · 1094 days ago · 7 km deep · 36 km away
  30. 1.829 km ESE of Atka, Alaska · 1094 days ago · 13 km deep · 63 km away
  31. 1.660 km WSW of Atka, Alaska · 1094 days ago · 66 km deep · 83 km away
  32. 2.526 km SSW of Atka, Alaska · 1094 days ago · 74 km deep · 54 km away
  33. 1.957 km SW of Atka, Alaska · 1094 days ago · 38 km deep · 56 km away
  34. 1.932 km ESE of Atka, Alaska · 1094 days ago · 17 km deep · 66 km away
  35. 2.138 km ESE of Atka, Alaska · 1094 days ago · 13 km deep · 59 km away
  36. 2.797 km ESE of Adak, Alaska · 1092 days ago · 35 km deep · 90 km away
  37. 1.966 km SW of Atka, Alaska · 1091 days ago · 29 km deep · 59 km away
  38. 1.647 km W of Atka, Alaska · 1091 days ago · 13 km deep · 91 km away
  39. 3.0103 km SSW of Atka, Alaska · 1089 days ago · 35 km deep · 72 km away
  40. 3.245 km SE of Atka, Alaska · 1089 days ago · 10 km deep · 50 km away
  41. 2.949 km ESE of Atka, Alaska · 1089 days ago · 11 km deep · 55 km away
  42. 3.579 km SE of Atka, Alaska · 1089 days ago · 35 km deep · 45 km away
  43. 3.519 km N of Atka, Alaska · 1089 days ago · 203 km deep · 93 km away
  44. 2.578 km SW of Atka, Alaska · 1088 days ago · 35 km deep · 65 km away
  45. 2.850 km ESE of Atka, Alaska · 1088 days ago · 10 km deep · 55 km away
  46. 1.854 km SSW of Atka, Alaska · 1088 days ago · 14 km deep · 49 km away
  47. 1.941 km E of Atka, Alaska · 1088 days ago · 13 km deep · 73 km away
  48. 2.636 km S of Atka, Alaska · 1087 days ago · 66 km deep · 38 km away
  49. 2.143 km E of Atka, Alaska · 1087 days ago · 28 km deep · 74 km away
  50. 1.960 km SE of Atka, Alaska · 1087 days ago · 55 km deep · 50 km away
  51. 1.536 km ESE of Atka, Alaska · 1087 days ago · 14 km deep · 56 km away
  52. 2.1160 km S of Atka, Alaska · 1087 days ago · 4 km deep · 87 km away
  53. 3.549 km SE of Atka, Alaska · 1086 days ago · 5 km deep · 47 km away
  54. 1.637 km ESE of Atka, Alaska · 1086 days ago · 6 km deep · 61 km away
  55. 1.634 km ESE of Atka, Alaska · 1086 days ago · 7 km deep · 57 km away
  56. 1.938 km ESE of Atka, Alaska · 1086 days ago · 7 km deep · 62 km away
  57. 3.623 km SE of Atka, Alaska · 1086 days ago · 172 km deep · 53 km away
  58. 3.951 km E of Atka, Alaska · 1086 days ago · 78 km deep · 79 km away
  59. 2.095 km ESE of Adak, Alaska · 1086 days ago · 38 km deep · 92 km away
  60. 2.330 km SSW of Atka, Alaska · 1086 days ago · 91 km deep · 53 km away

The first 60 of 116.

Before

  1. 1.6Andreanof Islands, Aleutian Islands, Alaska · 1106 days ago · 1 km deep · 84 km away
  2. 2.8Andreanof Islands, Aleutian Islands, Alaska · 1106 days ago · 10 km deep · 53 km away
  3. 3.1Andreanof Islands, Aleutian Islands, Alaska · 1108 days ago · 10 km deep · 55 km away
  4. 1.610 km SSW of Atka, Alaska · 1108 days ago · 9 km deep · 65 km away
  5. 3.148 km SE of Atka, Alaska · 1108 days ago · 10 km deep · 53 km away
  6. 3.176 km ESE of Atka, Alaska · 1109 days ago · 73 km deep · 71 km away
  7. 3.9Andreanof Islands, Aleutian Islands, Alaska · 1109 days ago · 85 km deep · 74 km away
  8. 1.631 km E of Atka, Alaska · 1109 days ago · 17 km deep · 74 km away
  9. 2.9109 km SSW of Atka, Alaska · 1109 days ago · 35 km deep · 76 km away
  10. 1.835 km ESE of Atka, Alaska · 1109 days ago · 9 km deep · 62 km away
  11. 3.245 km SE of Atka, Alaska · 1109 days ago · 10 km deep · 48 km away
  12. 2.134 km ESE of Atka, Alaska · 1110 days ago · 6 km deep · 62 km away
  13. 1.792 km ESE of Adak, Alaska · 1110 days ago · 29 km deep · 95 km away
  14. 3.338 km ESE of Atka, Alaska · 1111 days ago · 17 km deep · 69 km away
  15. 2.435 km ESE of Atka, Alaska · 1111 days ago · 8 km deep · 58 km away
  16. 1.731 km ESE of Atka, Alaska · 1111 days ago · 8 km deep · 62 km away
  17. 2.378 km ESE of Atka, Alaska · 1112 days ago · 38 km deep · 71 km away
  18. 3.449 km ESE of Atka, Alaska · 1112 days ago · 10 km deep · 56 km away
  19. 2.3Andreanof Islands, Aleutian Islands, Alaska · 1112 days ago · 7 km deep · 49 km away
  20. 2.055 km S of Atka, Alaska · 1114 days ago · 18 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000lb33 (also filed as ak023c4w1bim). Read Thu, Oct 1, 2026, 3:36 AM UTC.