Alaska earthquakes

M3.8 earthquake 103 km S of Adak, Alaska

A magnitude 3.8 earthquake struck 103 km S of Adak, Alaska on Sun, Sep 28, 2025, 11:31 AM HADT (20:31 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 67 km SSW 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
3.8 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2025-09-28 20:31:13 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.959° N, 176.904° 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
3.8mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.207 · 6 stations
3.4ML, 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 4.1 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.21
Depth from
Operator assigned
Station coverage gap
228°, poorly surrounded by stations
Stations used
26

Nearby

Within 100 km, magnitude 1.5 and up: 44 in the 60 days after this one and 20 in the 30 days before it.

After

  1. 1.651 km SW of Adak, Alaska · 368 days ago · 14 km deep · 75 km away
  2. 2.757 km SSW of Adak, Alaska · 362 days ago · 34 km deep · 46 km away
  3. 2.6122 km SW of Adak, Alaska · 349 days ago · 35 km deep · 83 km away
  4. 2.672 km SE of Adak, Alaska · 349 days ago · 35 km deep · 77 km away
  5. 2.454 km SW of Adak, Alaska · 349 days ago · 36 km deep · 59 km away
  6. 1.8121 km WSW of Adak, Alaska · 349 days ago · 35 km deep · 100 km away
  7. 1.618 km W of Adak, Alaska · 347 days ago · 3 km deep · 99 km away
  8. 4.971 km SSW of Adak, Alaska · 347 days ago · 37 km deep · 39 km away · felt by 2
  9. 4.947 km SE of Adak, Alaska · 342 days ago · 57 km deep · 87 km away · felt by 1
  10. 3.8120 km SW of Adak, Alaska · 341 days ago · 31 km deep · 86 km away
  11. 1.576 km WSW of Adak, Alaska · 339 days ago · 18 km deep · 90 km away
  12. 2.383 km WSW of Adak, Alaska · 334 days ago · 14 km deep · 76 km away
  13. 3.693 km WSW of Adak, Alaska · 325 days ago · 87 km deep · 96 km away
  14. 3.010 km S of Adak, Alaska · 323 days ago · 67 km deep · 94 km away
  15. 3.676 km SSW of Adak, Alaska · 323 days ago · 35 km deep · 33 km away
  16. 2.567 km SSE of Adak, Alaska · 318 days ago · 35 km deep · 68 km away
  17. 2.015 km SSE of Adak, Alaska · 317 days ago · 59 km deep · 90 km away
  18. 3.267 km SE of Adak, Alaska · 317 days ago · 35 km deep · 89 km away
  19. 2.3106 km WSW of Adak, Alaska · 317 days ago · 35 km deep · 91 km away
  20. 2.977 km SW of Adak, Alaska · 317 days ago · 35 km deep · 74 km away
  21. 3.029 km SSW of Adak, Alaska · 317 days ago · 69 km deep · 76 km away
  22. 3.1119 km SW of Adak, Alaska · 316 days ago · 35 km deep · 77 km away
  23. 2.478 km WSW of Adak, Alaska · 316 days ago · 17 km deep · 79 km away
  24. 4.3124 km SW of Adak, Alaska · 315 days ago · 46 km deep · 89 km away
  25. 2.754 km S of Adak, Alaska · 314 days ago · 35 km deep · 56 km away
  26. 2.695 km SSE of Adak, Alaska · 314 days ago · 14 km deep · 49 km away
  27. 3.6127 km SW of Adak, Alaska · 314 days ago · 10 km deep · 79 km away
  28. 5.567 km SSW of Adak, Alaska · 313 days ago · 33 km deep · 40 km away · felt by 3
  29. 3.171 km SSW of Adak, Alaska · 313 days ago · 35 km deep · 34 km away
  30. 2.775 km SSW of Adak, Alaska · 313 days ago · 35 km deep · 34 km away
  31. 4.065 km SSW of Adak, Alaska · 313 days ago · 35 km deep · 43 km away
  32. 2.367 km SSW of Adak, Alaska · 312 days ago · 35 km deep · 47 km away
  33. 2.3105 km WSW of Adak, Alaska · 311 days ago · 20 km deep · 88 km away
  34. 2.269 km SSW of Adak, Alaska · 311 days ago · 35 km deep · 36 km away
  35. 2.353 km SE of Adak, Alaska · 311 days ago · 38 km deep · 91 km away
  36. 2.1109 km WSW of Adak, Alaska · 311 days ago · 13 km deep · 98 km away
  37. 2.462 km SSW of Adak, Alaska · 311 days ago · 42 km deep · 46 km away
  38. 2.760 km SSW of Adak, Alaska · 310 days ago · 35 km deep · 48 km away
  39. 2.259 km SSW of Adak, Alaska · 309 days ago · 38 km deep · 52 km away
  40. 2.660 km SE of Adak, Alaska · 309 days ago · 35 km deep · 95 km away
  41. 2.864 km SE of Adak, Alaska · 309 days ago · 35 km deep · 91 km away
  42. 2.349 km S of Adak, Alaska · 309 days ago · 41 km deep · 60 km away
  43. 2.866 km SSW of Adak, Alaska · 309 days ago · 35 km deep · 41 km away
  44. 2.055 km SSE of Adak, Alaska · 309 days ago · 9 km deep · 68 km away

Before

  1. 2.695 km WSW of Adak, Alaska · 369 days ago · 34 km deep · 89 km away
  2. 2.066 km SE of Adak, Alaska · 370 days ago · 26 km deep · 78 km away
  3. 2.1117 km SW of Adak, Alaska · 370 days ago · 26 km deep · 79 km away
  4. 1.866 km SSE of Adak, Alaska · 370 days ago · 21 km deep · 60 km away
  5. 1.850 km SW of Adak, Alaska · 370 days ago · 15 km deep · 69 km away
  6. 4.095 km SSE of Adak, Alaska · 372 days ago · 10 km deep · 66 km away · felt by 1
  7. 3.898 km SW of Adak, Alaska · 374 days ago · 43 km deep · 58 km away
  8. 5.5122 km SW of Adak, Alaska · 376 days ago · 30 km deep · 83 km away · felt by 4 · tsunami flag
  9. 3.8110 km SSW of Adak, Alaska · 392 days ago · 8 km deep · 19 km away
  10. 1.883 km SW of Adak, Alaska · 394 days ago · 22 km deep · 64 km away
  11. 2.773 km SSE of Adak, Alaska · 394 days ago · 25 km deep · 69 km away
  12. 1.895 km SW of Adak, Alaska · 394 days ago · 27 km deep · 59 km away
  13. 2.740 km SW of Adak, Alaska · 394 days ago · 77 km deep · 80 km away
  14. 1.953 km SE of Adak, Alaska · 395 days ago · 56 km deep · 86 km away
  15. 1.953 km SSE of Adak, Alaska · 395 days ago · 56 km deep · 73 km away
  16. 1.895 km SW of Adak, Alaska · 396 days ago · 23 km deep · 78 km away
  17. 2.031 km SSW of Adak, Alaska · 396 days ago · 63 km deep · 73 km away
  18. 2.147 km SE of Adak, Alaska · 397 days ago · 37 km deep · 82 km away
  19. 3.3109 km WSW of Adak, Alaska · 398 days ago · 13 km deep · 98 km away
  20. 2.9101 km SW of Adak, Alaska · 398 days ago · 35 km deep · 64 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000rdhj (also filed as ak025cgiqegh). Read Fri, Oct 2, 2026, 8:09 AM UTC.