Alaska earthquakes

M3.1 earthquake 54 km SE of Adak, Alaska

A magnitude 3.1 earthquake struck 54 km SE of Adak, Alaska on Mon, Aug 18, 2025, 10:18 AM HADT (19:18 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.4 100 km SW 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
3.1 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-08-18 19:18:29 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.475° N, 176.164° 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
3.1ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.081 · 20 stations
2.7ML, 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 4.2 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
201°, poorly surrounded by stations
Stations used
24

Nearby

Within 100 km, magnitude 1.5 and up: 77 in the 60 days after this one and 117 in the 30 days before it.

After

  1. 1.862 km SE of Adak, Alaska · 409 days ago · 26 km deep · 15 km away
  2. 1.663 km SE of Adak, Alaska · 409 days ago · 26 km deep · 9 km away
  3. 2.562 km SSW of Adak, Alaska · 409 days ago · 43 km deep · 65 km away
  4. 1.563 km SE of Adak, Alaska · 409 days ago · 26 km deep · 15 km away
  5. 2.798 km ESE of Adak, Alaska · 409 days ago · 35 km deep · 63 km away
  6. 1.853 km SSE of Adak, Alaska · 409 days ago · 24 km deep · 14 km away
  7. 3.164 km SE of Adak, Alaska · 409 days ago · 35 km deep · 12 km away
  8. 1.960 km SE of Adak, Alaska · 408 days ago · 23 km deep · 10 km away
  9. 1.854 km S of Adak, Alaska · 408 days ago · 26 km deep · 27 km away
  10. 1.799 km SW of Atka, Alaska · 408 days ago · 26 km deep · 68 km away
  11. 1.569 km SSW of Adak, Alaska · 408 days ago · 26 km deep · 59 km away
  12. 1.957 km WSW of Atka, Alaska · 408 days ago · 69 km deep · 100 km away
  13. 3.468 km SW of Adak, Alaska · 408 days ago · 60 km deep · 83 km away
  14. 3.069 km SW of Atka, Alaska · 406 days ago · 35 km deep · 93 km away
  15. 2.858 km WSW of Adak, Alaska · 406 days ago · 10 km deep · 89 km away
  16. 2.665 km SSE of Adak, Alaska · 405 days ago · 35 km deep · 11 km away
  17. 3.093 km SW of Atka, Alaska · 405 days ago · 35 km deep · 70 km away
  18. 1.954 km SSE of Adak, Alaska · 405 days ago · 26 km deep · 22 km away
  19. 2.193 km ESE of Adak, Alaska · 405 days ago · 42 km deep · 63 km away
  20. 1.866 km SSE of Adak, Alaska · 405 days ago · 23 km deep · 20 km away
  21. 1.962 km SE of Adak, Alaska · 404 days ago · 23 km deep · 9 km away
  22. 1.962 km SSE of Adak, Alaska · 404 days ago · 24 km deep · 9 km away
  23. 1.964 km SE of Adak, Alaska · 404 days ago · 24 km deep · 9 km away
  24. 2.565 km S of Adak, Alaska · 404 days ago · 35 km deep · 49 km away
  25. 3.775 km SW of Adak, Alaska · 404 days ago · 40 km deep · 86 km away
  26. 1.655 km ENE of Adak, Alaska · 404 days ago · 9 km deep · 72 km away
  27. 3.088 km SSE of Adak, Alaska · 403 days ago · 20 km deep · 38 km away
  28. 1.962 km SE of Adak, Alaska · 403 days ago · 26 km deep · 15 km away
  29. 1.846 km SSE of Adak, Alaska · 403 days ago · 29 km deep · 12 km away
  30. 2.596 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 45 km away
  31. 1.891 km SSE of Adak, Alaska · 402 days ago · 17 km deep · 41 km away
  32. 2.191 km SSE of Adak, Alaska · 402 days ago · 15 km deep · 43 km away
  33. 2.6107 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 57 km away
  34. 2.692 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 43 km away
  35. 2.894 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 44 km away
  36. 2.9101 km SSE of Adak, Alaska · 402 days ago · 13 km deep · 50 km away
  37. 3.388 km SSE of Adak, Alaska · 402 days ago · 24 km deep · 38 km away
  38. 3.4105 km SSE of Adak, Alaska · 402 days ago · 12 km deep · 56 km away
  39. 1.891 km SSE of Adak, Alaska · 402 days ago · 25 km deep · 41 km away
  40. 1.884 km SSE of Adak, Alaska · 402 days ago · 18 km deep · 34 km away
  41. 1.967 km SSW of Adak, Alaska · 402 days ago · 33 km deep · 61 km away
  42. 3.253 km SE of Adak, Alaska · 401 days ago · 35 km deep · 11 km away
  43. 2.698 km SSE of Adak, Alaska · 401 days ago · 10 km deep · 47 km away
  44. 1.656 km WSW of Adak, Alaska · 401 days ago · 7 km deep · 94 km away
  45. 2.96 km SSE of Adak, Alaska · 401 days ago · 75 km deep · 49 km away
  46. 2.290 km SSE of Adak, Alaska · 400 days ago · 13 km deep · 41 km away
  47. 2.799 km SSE of Adak, Alaska · 400 days ago · 33 km deep · 50 km away
  48. 2.094 km SSE of Adak, Alaska · 400 days ago · 26 km deep · 44 km away
  49. 1.989 km SW of Atka, Alaska · 400 days ago · 41 km deep · 69 km away
  50. 1.642 km SSE of Adak, Alaska · 400 days ago · 36 km deep · 14 km away
  51. 1.756 km SE of Adak, Alaska · 400 days ago · 25 km deep · 2 km away
  52. 2.678 km ENE of Adak, Alaska · 400 days ago · 182 km deep · 93 km away
  53. 2.7105 km SW of Atka, Alaska · 398 days ago · 35 km deep · 75 km away
  54. 2.147 km SE of Adak, Alaska · 397 days ago · 37 km deep · 9 km away
  55. 2.031 km SSW of Adak, Alaska · 396 days ago · 63 km deep · 45 km away
  56. 3.340 km NNW of Adak, Alaska · 395 days ago · 173 km deep · 95 km away
  57. 1.953 km SSE of Adak, Alaska · 395 days ago · 56 km deep · 5 km away
  58. 1.953 km SE of Adak, Alaska · 395 days ago · 56 km deep · 9 km away
  59. 2.740 km SW of Adak, Alaska · 395 days ago · 77 km deep · 70 km away
  60. 2.773 km SSE of Adak, Alaska · 394 days ago · 25 km deep · 19 km away

The first 60 of 77.

Before

  1. 1.564 km SSW of Adak, Alaska · 410 days ago · 21 km deep · 55 km away
  2. 2.089 km SSE of Adak, Alaska · 410 days ago · 7 km deep · 42 km away
  3. 1.868 km WSW of Atka, Alaska · 410 days ago · 126 km deep · 93 km away
  4. 1.665 km WSW of Adak, Alaska · 411 days ago · 69 km deep · 97 km away
  5. 1.779 km SW of Adak, Alaska · 411 days ago · 24 km deep · 99 km away
  6. 1.964 km NE of Adak, Alaska · 411 days ago · 162 km deep · 96 km away
  7. 2.948 km ESE of Adak, Alaska · 412 days ago · 63 km deep · 27 km away
  8. 3.716 km SE of Adak, Alaska · 412 days ago · 100 km deep · 40 km away
  9. 1.659 km SSE of Adak, Alaska · 412 days ago · 26 km deep · 5 km away
  10. 2.252 km SSE of Adak, Alaska · 413 days ago · 26 km deep · 22 km away
  11. 3.371 km SSW of Adak, Alaska · 413 days ago · 35 km deep · 63 km away
  12. 2.716 km SSE of Adak, Alaska · 414 days ago · 16 km deep · 39 km away
  13. 1.946 km NE of Adak, Alaska · 414 days ago · 126 km deep · 76 km away
  14. 1.562 km SE of Adak, Alaska · 414 days ago · 26 km deep · 9 km away
  15. 1.765 km ESE of Adak, Alaska · 414 days ago · 23 km deep · 25 km away
  16. 1.556 km SSW of Adak, Alaska · 414 days ago · 32 km deep · 62 km away
  17. 1.974 km SSE of Adak, Alaska · 415 days ago · 25 km deep · 29 km away
  18. 1.663 km SE of Adak, Alaska · 415 days ago · 25 km deep · 13 km away
  19. 1.718 km E of Adak, Alaska · 415 days ago · 90 km deep · 44 km away
  20. 1.955 km SSE of Adak, Alaska · 416 days ago · 27 km deep · 11 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000ridj (also filed as ak025akp0z4c). Read Fri, Oct 2, 2026, 9:48 AM UTC.