Alaska earthquakes

M4.0 earthquake 93 km ESE of Adak, Alaska

A magnitude 4.0 earthquake struck 93 km ESE of Adak, Alaska on Thu, Oct 31, 2019, 3:01 AM HADT (12:01 UTC), 28 km (17 mi) below the surface.

A larger quake followed: M6.3 95 km SE 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
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-10-31 12:01:20 UTC
Depth
27.7 km (17.2 mi), shallow
Epicenter
51.505° N, 175.422° 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
4.0mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.101 · 26 stations
3.5ML, 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, 5.9 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
96°
Stations used
61

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 60 in the 30 days before it.

After

  1. 2.070 km SSW of Atka, Alaska · 2526 days ago · 26 km deep · 69 km away
  2. 2.071 km E of Adak, Alaska · 2525 days ago · 86 km deep · 51 km away
  3. 2.074 km SW of Atka, Alaska · 2525 days ago · 54 km deep · 42 km away
  4. 1.656 km SE of Adak, Alaska · 2524 days ago · 26 km deep · 48 km away
  5. 1.938 km SSE of Adak, Alaska · 2523 days ago · 40 km deep · 65 km away
  6. 1.968 km SW of Atka, Alaska · 2522 days ago · 20 km deep · 46 km away
  7. 2.870 km SE of Adak, Alaska · 2522 days ago · 35 km deep · 45 km away
  8. 2.268 km S of Adak, Alaska · 2522 days ago · 25 km deep · 79 km away
  9. 1.615 km ENE of Adak, Alaska · 2522 days ago · 95 km deep · 85 km away
  10. 2.467 km S of Adak, Alaska · 2522 days ago · 38 km deep · 86 km away
  11. 1.547 km SE of Adak, Alaska · 2521 days ago · 32 km deep · 55 km away
  12. 2.073 km SSE of Adak, Alaska · 2521 days ago · 24 km deep · 67 km away
  13. 2.727 km S of Adak, Alaska · 2521 days ago · 47 km deep · 88 km away
  14. 2.384 km SW of Atka, Alaska · 2520 days ago · 29 km deep · 31 km away
  15. 1.6Andreanof Islands, Aleutian Islands, Alaska · 2517 days ago · 52 km deep · 80 km away
  16. 1.753 km SSW of Atka, Alaska · 2517 days ago · 34 km deep · 73 km away
  17. 3.995 km ESE of Adak, Alaska · 2517 days ago · 51 km deep · 20 km away
  18. 1.846 km E of Adak, Alaska · 2516 days ago · 66 km deep · 50 km away
  19. 2.074 km SW of Atka, Alaska · 2516 days ago · 39 km deep · 40 km away
  20. 2.354 km SE of Adak, Alaska · 2516 days ago · 24 km deep · 50 km away
  21. 2.59 km SE of Adak, Alaska · 2515 days ago · 79 km deep · 84 km away
  22. 1.919 km SSW of Atka, Alaska · 2514 days ago · 11 km deep · 96 km away
  23. 1.630 km NE of Adak, Alaska · 2514 days ago · 11 km deep · 86 km away
  24. 2.646 km S of Adak, Alaska · 2514 days ago · 37 km deep · 87 km away
  25. 2.055 km SSE of Adak, Alaska · 2513 days ago · 35 km deep · 55 km away
  26. 1.74 km N of Adak, Alaska · 2512 days ago · 81 km deep · 95 km away
  27. 2.266 km ESE of Adak, Alaska · 2512 days ago · 25 km deep · 28 km away
  28. 3.716 km SSE of Adak, Alaska · 2512 days ago · 61 km deep · 80 km away
  29. 1.855 km SW of Atka, Alaska · 2511 days ago · 36 km deep · 61 km away
  30. 1.972 km SSW of Atka, Alaska · 2511 days ago · 19 km deep · 60 km away
  31. 4.081 km S of Atka, Alaska · 2511 days ago · 35 km deep · 95 km away
  32. 2.465 km ESE of Adak, Alaska · 2511 days ago · 48 km deep · 28 km away
  33. 2.362 km SSE of Adak, Alaska · 2511 days ago · 24 km deep · 60 km away
  34. 3.681 km SW of Atka, Alaska · 2511 days ago · 34 km deep · 37 km away
  35. 1.777 km SW of Atka, Alaska · 2511 days ago · 26 km deep · 38 km away
  36. 2.577 km SSE of Adak, Alaska · 2510 days ago · 35 km deep · 69 km away
  37. 1.977 km S of Atka, Alaska · 2510 days ago · 4 km deep · 76 km away
  38. 2.469 km SE of Adak, Alaska · 2509 days ago · 26 km deep · 31 km away
  39. 1.747 km S of Adak, Alaska · 2509 days ago · 32 km deep · 78 km away
  40. 2.164 km SSE of Adak, Alaska · 2509 days ago · 26 km deep · 70 km away
  41. 2.363 km ENE of Adak, Alaska · 2509 days ago · 173 km deep · 58 km away
  42. 1.784 km SE of Adak, Alaska · 2509 days ago · 19 km deep · 22 km away
  43. 1.862 km WSW of Atka, Alaska · 2508 days ago · 57 km deep · 54 km away
  44. 4.366 km SE of Adak, Alaska · 2508 days ago · 35 km deep · 35 km away
  45. 1.686 km SSE of Adak, Alaska · 2508 days ago · 16 km deep · 50 km away
  46. 2.022 km SE of Adak, Alaska · 2505 days ago · 59 km deep · 71 km away
  47. 1.943 km WSW of Atka, Alaska · 2505 days ago · 13 km deep · 73 km away
  48. 1.557 km S of Adak, Alaska · 2504 days ago · 26 km deep · 95 km away
  49. 1.967 km SSE of Adak, Alaska · 2504 days ago · 24 km deep · 59 km away
  50. 6.395 km SE of Adak, Alaska · 2504 days ago · 20 km deep · 15 km away · felt by 5 · tsunami flag
  51. 4.598 km SE of Adak, Alaska · 2504 days ago · 26 km deep · 19 km away
  52. 4.0Andreanof Islands, Aleutian Islands, Alaska · 2504 days ago · 10 km deep · 27 km away
  53. 3.399 km SE of Adak, Alaska · 2504 days ago · 28 km deep · 21 km away
  54. 3.099 km SE of Adak, Alaska · 2504 days ago · 10 km deep · 23 km away
  55. 3.598 km SE of Adak, Alaska · 2504 days ago · 10 km deep · 32 km away
  56. 3.0102 km SE of Adak, Alaska · 2504 days ago · 10 km deep · 20 km away
  57. 4.2105 km SE of Adak, Alaska · 2504 days ago · 10 km deep · 25 km away
  58. 2.385 km SE of Adak, Alaska · 2504 days ago · 25 km deep · 18 km away
  59. 2.899 km SE of Adak, Alaska · 2504 days ago · 10 km deep · 23 km away
  60. 2.7101 km SE of Adak, Alaska · 2504 days ago · 10 km deep · 28 km away

The first 60 of at least 199.

Before

  1. 2.6141 km SSE of Adak, Alaska · 2527 days ago · 30 km deep · 96 km away
  2. 1.974 km SSE of Adak, Alaska · 2528 days ago · 26 km deep · 71 km away
  3. 1.847 km SSE of Adak, Alaska · 2528 days ago · 37 km deep · 63 km away
  4. 1.738 km WSW of Atka, Alaska · 2529 days ago · 69 km deep · 77 km away
  5. 1.8106 km SE of Adak, Alaska · 2529 days ago · 14 km deep · 50 km away
  6. 1.8Andreanof Islands, Aleutian Islands, Alaska · 2529 days ago · 26 km deep · 75 km away
  7. 2.4119 km SSW of Atka, Alaska · 2529 days ago · 11 km deep · 32 km away
  8. 2.3116 km SSW of Atka, Alaska · 2529 days ago · 10 km deep · 31 km away
  9. 1.860 km SE of Adak, Alaska · 2529 days ago · 23 km deep · 43 km away
  10. 2.5125 km SSW of Atka, Alaska · 2529 days ago · 10 km deep · 42 km away
  11. 2.069 km S of Atka, Alaska · 2529 days ago · 27 km deep · 95 km away
  12. 2.1117 km SSW of Atka, Alaska · 2529 days ago · 6 km deep · 34 km away
  13. 1.863 km S of Adak, Alaska · 2533 days ago · 27 km deep · 77 km away
  14. 1.918 km ESE of Adak, Alaska · 2533 days ago · 64 km deep · 74 km away
  15. 2.251 km S of Adak, Alaska · 2534 days ago · 29 km deep · 91 km away
  16. 2.438 km SSE of Adak, Alaska · 2535 days ago · 36 km deep · 66 km away
  17. 1.681 km SSE of Adak, Alaska · 2536 days ago · 19 km deep · 71 km away
  18. 3.059 km SE of Adak, Alaska · 2536 days ago · 34 km deep · 46 km away
  19. 1.559 km SE of Adak, Alaska · 2537 days ago · 22 km deep · 48 km away
  20. 1.966 km ESE of Adak, Alaska · 2537 days ago · 27 km deep · 26 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000698m (also filed as ak019dyyiyjf). Read Thu, Oct 1, 2026, 4:55 PM UTC.