Alaska earthquakes

M3.8 earthquake 83 km S of Unalaska, Alaska

A magnitude 3.8 earthquake struck 83 km S of Unalaska, Alaska on Mon, Apr 24, 2017, 7:18 AM AKDT (15:18 UTC), 26 km (16 mi) below the surface.

A larger quake followed: M5.9 163 km ESE of Nikolski, Alaska. This one was a foreshock.

Unalaska forecastMore in Alaska

Map

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
2017-04-24 15:18:40 UTC
Depth
25.6 km (15.9 mi), shallow
Epicenter
53.128° N, 166.634° W
Region
Alaska
Strongest shaking
II, weak shaking
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 · ±0.113 · 20 stations
3.6ML, local (Richter)Alaska Earthquake CenterPreliminary

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated
II, weak shaking
Map
Automatic
USGS ShakeMap: estimated shaking intensity around the epicenter
Estimated shaking intensity. Map: USGS ShakeMap.

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 9.2 km horizontally, 8.3 km in depth
Magnitude uncertainty
±0.11
Stations used
27

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 90 in the 60 days after this one and 49 in the 30 days before it.

After

  1. 2.478 km S of Unalaska, Alaska · 3448 days ago · 26 km deep · 5 km away
  2. 1.715 km E of Unalaska, Alaska · 3447 days ago · 93 km deep · 83 km away
  3. 1.876 km S of Unalaska, Alaska · 3447 days ago · 22 km deep · 9 km away
  4. 1.5101 km SSW of Unalaska, Alaska · 3446 days ago · 39 km deep · 46 km away
  5. 1.770 km SW of Unalaska, Alaska · 3446 days ago · 71 km deep · 58 km away
  6. 1.858 km SSE of Unalaska, Alaska · 3444 days ago · 42 km deep · 48 km away
  7. 2.767 km SW of Unalaska, Alaska · 3444 days ago · 68 km deep · 59 km away
  8. 2.182 km S of Unalaska, Alaska · 3443 days ago · 26 km deep · 9 km away
  9. 1.550 km SSE of Unalaska, Alaska · 3442 days ago · 48 km deep · 51 km away
  10. 1.668 km SE of Unalaska, Alaska · 3441 days ago · 23 km deep · 57 km away
  11. 1.678 km E of Nikolski, Alaska · 3440 days ago · 58 km deep · 73 km away
  12. 1.955 km E of Nikolski, Alaska · 3438 days ago · 76 km deep · 98 km away
  13. 1.548 km SW of Unalaska, Alaska · 3438 days ago · 17 km deep · 58 km away
  14. 1.573 km WSW of Unalaska, Alaska · 3438 days ago · 26 km deep · 83 km away
  15. 3.585 km E of Nikolski, Alaska · 3437 days ago · 48 km deep · 65 km away
  16. 2.175 km SSE of Akutan, Alaska · 3437 days ago · 21 km deep · 98 km away
  17. 2.375 km SSE of Akutan, Alaska · 3436 days ago · 41 km deep · 96 km away
  18. 1.787 km SE of Unalaska, Alaska · 3436 days ago · 17 km deep · 70 km away
  19. 1.875 km SSE of Akutan, Alaska · 3436 days ago · 13 km deep · 93 km away
  20. 1.665 km WSW of Unalaska, Alaska · 3434 days ago · 21 km deep · 70 km away
  21. 1.733 km SSE of Unalaska, Alaska · 3432 days ago · 65 km deep · 55 km away
  22. 1.976 km SSE of Unalaska, Alaska · 3431 days ago · 19 km deep · 42 km away
  23. 1.757 km S of Unalaska, Alaska · 3429 days ago · 58 km deep · 26 km away
  24. 1.8Fox Islands, Aleutian Islands, Alaska · 3429 days ago · 13 km deep · 77 km away
  25. 1.884 km S of Unalaska, Alaska · 3428 days ago · 13 km deep · 7 km away
  26. 2.5122 km SSE of Unalaska, Alaska · 3428 days ago · 30 km deep · 66 km away
  27. 1.8113 km SSE of Unalaska, Alaska · 3428 days ago · 10 km deep · 60 km away
  28. 1.6113 km SSE of Unalaska, Alaska · 3428 days ago · 12 km deep · 60 km away
  29. 1.6110 km SSE of Unalaska, Alaska · 3428 days ago · 11 km deep · 66 km away
  30. 1.871 km SE of Unalaska, Alaska · 3428 days ago · 16 km deep · 69 km away
  31. 1.9108 km SSE of Unalaska, Alaska · 3428 days ago · 5 km deep · 60 km away
  32. 3.291 km E of Nikolski, Alaska · 3425 days ago · 51 km deep · 60 km away
  33. 2.085 km ENE of Nikolski, Alaska · 3425 days ago · 62 km deep · 66 km away
  34. 1.617 km S of Unalaska, Alaska · 3422 days ago · 98 km deep · 66 km away
  35. 2.337 km SSW of Unalaska, Alaska · 3422 days ago · 67 km deep · 47 km away
  36. 2.1100 km E of Nikolski, Alaska · 3419 days ago · 26 km deep · 55 km away
  37. 2.5101 km SE of Unalaska, Alaska · 3419 days ago · 10 km deep · 70 km away
  38. 1.736 km SSE of Unalaska, Alaska · 3418 days ago · 64 km deep · 59 km away
  39. 5.3163 km ESE of Nikolski, Alaska · 3418 days ago · 11 km deep · 90 km away
  40. 5.9163 km ESE of Nikolski, Alaska · 3418 days ago · 10 km deep · 90 km away · felt by 1 · tsunami flag
  41. 2.8155 km ESE of Nikolski, Alaska · 3418 days ago · 25 km deep · 83 km away
  42. 2.7156 km ESE of Nikolski, Alaska · 3418 days ago · 59 km deep · 89 km away
  43. 3.6163 km ESE of Nikolski, Alaska · 3417 days ago · 79 km deep · 92 km away
  44. 2.5165 km ESE of Nikolski, Alaska · 3417 days ago · 18 km deep · 93 km away
  45. 2.4163 km ESE of Nikolski, Alaska · 3417 days ago · 24 km deep · 95 km away
  46. 3.881 km SSW of Unalaska, Alaska · 3417 days ago · 35 km deep · 39 km away
  47. 2.1166 km ESE of Nikolski, Alaska · 3416 days ago · 14 km deep · 90 km away
  48. 2.0147 km ESE of Nikolski, Alaska · 3416 days ago · 25 km deep · 87 km away
  49. 3.492 km E of Nikolski, Alaska · 3416 days ago · 38 km deep · 58 km away
  50. 2.2154 km ESE of Nikolski, Alaska · 3416 days ago · 20 km deep · 81 km away
  51. 2.1141 km S of Unalaska, Alaska · 3415 days ago · 25 km deep · 58 km away
  52. 2.038 km SSW of Unalaska, Alaska · 3414 days ago · 73 km deep · 50 km away
  53. 1.9148 km S of Unalaska, Alaska · 3414 days ago · 5 km deep · 65 km away
  54. 2.7161 km ESE of Nikolski, Alaska · 3414 days ago · 25 km deep · 94 km away
  55. 1.8131 km S of Unalaska, Alaska · 3413 days ago · 5 km deep · 48 km away
  56. 2.3155 km ESE of Nikolski, Alaska · 3413 days ago · 10 km deep · 74 km away
  57. 2.882 km ENE of Nikolski, Alaska · 3412 days ago · 157 km deep · 71 km away
  58. 3.497 km E of Nikolski, Alaska · 3412 days ago · 37 km deep · 56 km away
  59. 1.994 km E of Nikolski, Alaska · 3412 days ago · 38 km deep · 56 km away
  60. 2.5145 km ESE of Nikolski, Alaska · 3411 days ago · 26 km deep · 69 km away

The first 60 of 90.

Before

  1. 2.370 km SE of Unalaska, Alaska · 3448 days ago · 25 km deep · 66 km away
  2. 2.379 km S of Unalaska, Alaska · 3448 days ago · 26 km deep · 4 km away
  3. 1.959 km SE of Unalaska, Alaska · 3450 days ago · 47 km deep · 71 km away
  4. 2.1101 km SSW of Unalaska, Alaska · 3452 days ago · 26 km deep · 23 km away
  5. 2.6111 km ESE of Nikolski, Alaska · 3452 days ago · 35 km deep · 69 km away
  6. 2.093 km E of Nikolski, Alaska · 3452 days ago · 53 km deep · 60 km away
  7. 2.46 km NW of Dutch Harbor, Alaska · 3452 days ago · 114 km deep · 89 km away
  8. 1.641 km S of Akutan, Alaska · 3453 days ago · 32 km deep · 91 km away
  9. 2.1130 km S of Unalaska, Alaska · 3454 days ago · 9 km deep · 47 km away
  10. 1.7101 km SSW of Unalaska, Alaska · 3455 days ago · 43 km deep · 49 km away
  11. 1.772 km WSW of Unalaska, Alaska · 3455 days ago · 14 km deep · 79 km away
  12. 2.229 km SSW of Akutan, Alaska · 3455 days ago · 70 km deep · 96 km away
  13. 1.555 km WSW of Unalaska, Alaska · 3456 days ago · 14 km deep · 66 km away
  14. 1.758 km SW of Unalaska, Alaska · 3456 days ago · 13 km deep · 63 km away
  15. 1.835 km SSW of Akutan, Alaska · 3458 days ago · 104 km deep · 90 km away
  16. 1.989 km SW of Unalaska, Alaska · 3461 days ago · 69 km deep · 75 km away
  17. 2.1126 km S of Unalaska, Alaska · 3461 days ago · 10 km deep · 43 km away
  18. 2.3126 km S of Unalaska, Alaska · 3461 days ago · 2 km deep · 43 km away
  19. 4.0130 km ESE of Nikolski, Alaska · 3461 days ago · 10 km deep · 52 km away
  20. 1.8south of the Aleutian Islands · 3462 days ago · 12 km deep · 60 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10008k9x (also filed as ak15808277, ak01758sb0d9). Read Fri, Oct 2, 2026, 12:50 PM UTC.