Alaska earthquakes

M2.9 earthquake 161 km SSW of Atka, Alaska

A magnitude 2.9 earthquake struck 161 km SSW of Atka, Alaska on Thu, Jul 31, 2025, 2:19 PM HADT (23:19 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.7 107 km S 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
2.9 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-07-31 23:19:39 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.830° N, 174.972° 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
2.9ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.115 · 10 stations
2.4ML, 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 6.4 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
240°, poorly surrounded by stations
Stations used
14

Nearby

Within 100 km, magnitude 1.5 and up: 66 in the 60 days after this one and 50 in the 30 days before it.

After

  1. 2.672 km ESE of Adak, Alaska · 427 days ago · 35 km deep · 97 km away
  2. 3.293 km SSE of Adak, Alaska · 426 days ago · 10 km deep · 94 km away
  3. 2.795 km SSW of Atka, Alaska · 424 days ago · 35 km deep · 72 km away
  4. 2.4142 km S of Atka, Alaska · 424 days ago · 15 km deep · 71 km away
  5. 2.7159 km SSE of Adak, Alaska · 424 days ago · 10 km deep · 78 km away
  6. 2.994 km SSE of Atka, Alaska · 424 days ago · 35 km deep · 96 km away
  7. 1.9124 km SE of Adak, Alaska · 423 days ago · 1 km deep · 45 km away
  8. 2.0100 km SE of Adak, Alaska · 423 days ago · 9 km deep · 64 km away
  9. 2.093 km SE of Adak, Alaska · 423 days ago · 25 km deep · 70 km away
  10. 1.691 km ESE of Adak, Alaska · 423 days ago · 26 km deep · 82 km away
  11. 2.1126 km S of Atka, Alaska · 423 days ago · 20 km deep · 77 km away
  12. 1.8100 km SSE of Adak, Alaska · 422 days ago · 5 km deep · 83 km away
  13. 1.788 km S of Atka, Alaska · 422 days ago · 20 km deep · 78 km away
  14. 2.690 km SSE of Adak, Alaska · 421 days ago · 10 km deep · 85 km away
  15. 2.793 km SW of Atka, Alaska · 420 days ago · 35 km deep · 89 km away
  16. 2.266 km SSW of Atka, Alaska · 417 days ago · 22 km deep · 96 km away
  17. 2.580 km SW of Atka, Alaska · 417 days ago · 35 km deep · 88 km away
  18. 2.694 km SW of Atka, Alaska · 416 days ago · 35 km deep · 88 km away
  19. 2.068 km SE of Adak, Alaska · 416 days ago · 38 km deep · 97 km away
  20. 1.874 km SSE of Adak, Alaska · 416 days ago · 13 km deep · 96 km away
  21. 1.663 km SE of Adak, Alaska · 415 days ago · 25 km deep · 100 km away
  22. 2.5174 km S of Atka, Alaska · 412 days ago · 25 km deep · 63 km away
  23. 1.8134 km S of Atka, Alaska · 410 days ago · 10 km deep · 65 km away
  24. 2.089 km SSE of Adak, Alaska · 410 days ago · 7 km deep · 96 km away
  25. 2.798 km ESE of Adak, Alaska · 409 days ago · 35 km deep · 89 km away
  26. 3.164 km SE of Adak, Alaska · 408 days ago · 35 km deep · 100 km away
  27. 2.9191 km SSE of Adak, Alaska · 408 days ago · 36 km deep · 58 km away
  28. 2.5239 km S of Atka, Alaska · 408 days ago · 15 km deep · 87 km away
  29. 1.799 km SW of Atka, Alaska · 408 days ago · 26 km deep · 80 km away
  30. 2.6228 km SSE of Adak, Alaska · 407 days ago · 20 km deep · 76 km away
  31. 3.093 km SW of Atka, Alaska · 405 days ago · 35 km deep · 88 km away
  32. 1.968 km SSW of Atka, Alaska · 405 days ago · 16 km deep · 92 km away
  33. 2.193 km ESE of Adak, Alaska · 405 days ago · 42 km deep · 99 km away
  34. 3.088 km SSE of Adak, Alaska · 403 days ago · 20 km deep · 90 km away
  35. 2.070 km SSW of Atka, Alaska · 403 days ago · 40 km deep · 92 km away
  36. 2.596 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 85 km away
  37. 1.891 km SSE of Adak, Alaska · 402 days ago · 17 km deep · 90 km away
  38. 2.191 km SSE of Adak, Alaska · 402 days ago · 15 km deep · 91 km away
  39. 2.6107 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 83 km away
  40. 2.692 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 91 km away
  41. 2.894 km SSE of Adak, Alaska · 402 days ago · 10 km deep · 86 km away
  42. 2.9101 km SSE of Adak, Alaska · 402 days ago · 13 km deep · 82 km away
  43. 3.388 km SSE of Adak, Alaska · 402 days ago · 24 km deep · 89 km away
  44. 3.4105 km SSE of Adak, Alaska · 402 days ago · 12 km deep · 86 km away
  45. 1.891 km SSE of Adak, Alaska · 402 days ago · 25 km deep · 88 km away
  46. 1.884 km SSE of Adak, Alaska · 402 days ago · 18 km deep · 93 km away
  47. 2.698 km SSE of Adak, Alaska · 401 days ago · 10 km deep · 84 km away
  48. 2.290 km SSE of Adak, Alaska · 400 days ago · 13 km deep · 92 km away
  49. 2.799 km SSE of Adak, Alaska · 400 days ago · 33 km deep · 86 km away
  50. 2.094 km SSE of Adak, Alaska · 400 days ago · 26 km deep · 87 km away
  51. 2.7105 km SW of Atka, Alaska · 397 days ago · 35 km deep · 67 km away
  52. 3.788 km S of Atka, Alaska · 397 days ago · 35 km deep · 87 km away
  53. 3.066 km S of Atka, Alaska · 397 days ago · 24 km deep · 99 km away
  54. 4.598 km S of Atka, Alaska · 396 days ago · 10 km deep · 91 km away
  55. 2.8213 km SSE of Adak, Alaska · 396 days ago · 10 km deep · 66 km away
  56. 3.4108 km SSE of Atka, Alaska · 396 days ago · 35 km deep · 89 km away
  57. 3.7111 km S of Atka, Alaska · 395 days ago · 10 km deep · 80 km away
  58. 4.7107 km S of Atka, Alaska · 395 days ago · 13 km deep · 85 km away
  59. 2.7102 km SSE of Atka, Alaska · 395 days ago · 35 km deep · 95 km away
  60. 2.5167 km S of Atka, Alaska · 395 days ago · 10 km deep · 56 km away

The first 60 of 66.

Before

  1. 1.884 km SW of Atka, Alaska · 428 days ago · 26 km deep · 91 km away
  2. 1.5115 km SSW of Atka, Alaska · 430 days ago · 26 km deep · 58 km away
  3. 1.8152 km SE of Adak, Alaska · 430 days ago · 26 km deep · 23 km away
  4. 1.8185 km SSE of Adak, Alaska · 431 days ago · 8 km deep · 40 km away
  5. 1.8136 km S of Atka, Alaska · 431 days ago · 11 km deep · 80 km away
  6. 1.9143 km SSE of Atka, Alaska · 433 days ago · 7 km deep · 87 km away
  7. 2.0130 km S of Atka, Alaska · 434 days ago · 15 km deep · 61 km away
  8. 2.174 km SE of Adak, Alaska · 434 days ago · 22 km deep · 90 km away
  9. 1.997 km SW of Atka, Alaska · 435 days ago · 26 km deep · 83 km away
  10. 1.894 km SW of Atka, Alaska · 435 days ago · 26 km deep · 85 km away
  11. 3.394 km SW of Atka, Alaska · 435 days ago · 35 km deep · 86 km away
  12. 2.9121 km SSW of Atka, Alaska · 436 days ago · 10 km deep · 46 km away
  13. 3.3127 km SSW of Atka, Alaska · 437 days ago · 35 km deep · 40 km away
  14. 1.7118 km SSW of Atka, Alaska · 437 days ago · 22 km deep · 46 km away
  15. 2.080 km SW of Atka, Alaska · 438 days ago · 22 km deep · 95 km away
  16. 3.086 km ESE of Adak, Alaska · 440 days ago · 35 km deep · 84 km away
  17. 2.1120 km SSW of Atka, Alaska · 441 days ago · 14 km deep · 47 km away
  18. 3.0122 km SSW of Atka, Alaska · 441 days ago · 15 km deep · 45 km away
  19. 2.9124 km SSW of Atka, Alaska · 441 days ago · 18 km deep · 41 km away
  20. 3.0119 km SSW of Atka, Alaska · 441 days ago · 22 km deep · 49 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rd0z (also filed as ak0259qzqpdn). Read Fri, Oct 2, 2026, 6:30 AM UTC.