Alaska earthquakes

M2.5 earthquake 147 km S of Unalaska, Alaska

A magnitude 2.5 earthquake struck 147 km S of Unalaska, Alaska on Mon, Aug 22, 2016, 2:39 PM AKDT (22:39 UTC), 27 km (17 mi) below the surface.

A larger quake followed: M4.6 120 km E 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
2.5 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2016-08-22 22:39:55 UTC
Depth
26.9 km (16.7 mi), shallow
Epicenter
52.550° N, 166.414° 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
2.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · 11 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 4.8 km horizontally, 21.6 km in depth
Depth from
From location
Station coverage gap
264°, poorly surrounded by stations
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 59 in the 60 days after this one and 90 in the 30 days before it.

After

  1. 3.5200 km SE of Nikolski, Alaska · 3693 days ago · 13 km deep · 84 km away
  2. 1.985 km SSW of Unalaska, Alaska · 3692 days ago · 26 km deep · 72 km away
  3. 1.7113 km ESE of Nikolski, Alaska · 3691 days ago · 10 km deep · 67 km away
  4. 2.2134 km S of Unalaska, Alaska · 3691 days ago · 15 km deep · 20 km away
  5. 1.8132 km S of Unalaska, Alaska · 3691 days ago · 12 km deep · 25 km away
  6. 2.2203 km SSE of Unalaska, Alaska · 3690 days ago · 41 km deep · 92 km away
  7. 2.2128 km S of Unalaska, Alaska · 3690 days ago · 6 km deep · 27 km away · felt by 1
  8. 4.582 km S of Unalaska, Alaska · 3690 days ago · 26 km deep · 70 km away
  9. 1.571 km S of Unalaska, Alaska · 3690 days ago · 47 km deep · 80 km away
  10. 2.078 km E of Nikolski, Alaska · 3686 days ago · 26 km deep · 94 km away
  11. 3.286 km E of Nikolski, Alaska · 3686 days ago · 46 km deep · 94 km away
  12. 2.2136 km S of Unalaska, Alaska · 3686 days ago · 37 km deep · 23 km away
  13. 1.885 km SSW of Unalaska, Alaska · 3686 days ago · 26 km deep · 73 km away
  14. 2.3141 km S of Unalaska, Alaska · 3686 days ago · 26 km deep · 18 km away
  15. 2.4192 km SSE of Unalaska, Alaska · 3682 days ago · 14 km deep · 71 km away
  16. 1.9103 km E of Nikolski, Alaska · 3680 days ago · 21 km deep · 74 km away
  17. 2.088 km SSW of Unalaska, Alaska · 3674 days ago · 29 km deep · 70 km away
  18. 2.161 km S of Unalaska, Alaska · 3674 days ago · 47 km deep · 89 km away
  19. 2.480 km SSW of Unalaska, Alaska · 3668 days ago · 30 km deep · 73 km away
  20. 2.064 km SSE of Unalaska, Alaska · 3665 days ago · 38 km deep · 96 km away
  21. 1.995 km E of Nikolski, Alaska · 3665 days ago · 25 km deep · 82 km away
  22. 2.3130 km S of Unalaska, Alaska · 3665 days ago · 20 km deep · 27 km away
  23. 2.3138 km S of Unalaska, Alaska · 3665 days ago · 20 km deep · 23 km away
  24. 1.798 km E of Nikolski, Alaska · 3664 days ago · 40 km deep · 91 km away
  25. 1.669 km SSE of Unalaska, Alaska · 3661 days ago · 26 km deep · 94 km away
  26. 3.4127 km ESE of Nikolski, Alaska · 3661 days ago · 28 km deep · 44 km away
  27. 2.6138 km ESE of Nikolski, Alaska · 3661 days ago · 39 km deep · 34 km away
  28. 4.6120 km E of Nikolski, Alaska · 3660 days ago · 46 km deep · 52 km away
  29. 3.1135 km ESE of Nikolski, Alaska · 3660 days ago · 10 km deep · 35 km away
  30. 2.2143 km ESE of Nikolski, Alaska · 3660 days ago · 22 km deep · 32 km away
  31. 2.4135 km ESE of Nikolski, Alaska · 3660 days ago · 8 km deep · 37 km away
  32. 2.1139 km S of Unalaska, Alaska · 3659 days ago · 19 km deep · 12 km away
  33. 1.8112 km S of Unalaska, Alaska · 3658 days ago · 5 km deep · 43 km away
  34. 1.792 km SSW of Unalaska, Alaska · 3657 days ago · 72 km deep · 87 km away
  35. 2.6219 km S of Unalaska, Alaska · 3654 days ago · 47 km deep · 74 km away
  36. 2.1121 km S of Unalaska, Alaska · 3653 days ago · 1 km deep · 34 km away
  37. 2.8124 km ESE of Nikolski, Alaska · 3653 days ago · 21 km deep · 47 km away
  38. 2.5127 km S of Unalaska, Alaska · 3652 days ago · 5 km deep · 24 km away
  39. 1.691 km E of Nikolski, Alaska · 3652 days ago · 34 km deep · 88 km away
  40. 2.087 km SSW of Unalaska, Alaska · 3651 days ago · 35 km deep · 90 km away
  41. 2.0102 km SSW of Unalaska, Alaska · 3650 days ago · 13 km deep · 82 km away
  42. 3.890 km SSW of Unalaska, Alaska · 3646 days ago · 20 km deep · 85 km away
  43. 3.9140 km S of Unalaska, Alaska · 3646 days ago · 24 km deep · 10 km away
  44. 3.3144 km ESE of Nikolski, Alaska · 3646 days ago · 10 km deep · 36 km away
  45. 3.7103 km E of Nikolski, Alaska · 3646 days ago · 22 km deep · 73 km away
  46. 2.261 km SSE of Unalaska, Alaska · 3646 days ago · 25 km deep · 99 km away
  47. 2.2133 km ESE of Nikolski, Alaska · 3646 days ago · 25 km deep · 39 km away
  48. 2.5141 km ESE of Nikolski, Alaska · 3646 days ago · 12 km deep · 37 km away
  49. 2.2139 km ESE of Nikolski, Alaska · 3646 days ago · 8 km deep · 36 km away
  50. 2.3150 km ESE of Nikolski, Alaska · 3646 days ago · 13 km deep · 34 km away
  51. 2.082 km SSW of Unalaska, Alaska · 3639 days ago · 26 km deep · 74 km away
  52. 1.983 km S of Unalaska, Alaska · 3638 days ago · 26 km deep · 70 km away
  53. 2.4130 km ESE of Nikolski, Alaska · 3638 days ago · 42 km deep · 49 km away
  54. 3.658 km SSW of Unalaska, Alaska · 3638 days ago · 36 km deep · 98 km away
  55. 2.3118 km S of Unalaska, Alaska · 3636 days ago · 19 km deep · 37 km away
  56. 1.7109 km SSW of Unalaska, Alaska · 3635 days ago · 13 km deep · 66 km away
  57. 3.2100 km E of Nikolski, Alaska · 3634 days ago · 25 km deep · 73 km away
  58. 1.792 km E of Nikolski, Alaska · 3634 days ago · 49 km deep · 85 km away
  59. 2.179 km ESE of Nikolski, Alaska · 3634 days ago · 50 km deep · 95 km away

Before

  1. 2.294 km SE of Unalaska, Alaska · 3696 days ago · 24 km deep · 96 km away
  2. 2.5Fox Islands, Aleutian Islands, Alaska · 3698 days ago · 41 km deep · 79 km away
  3. 2.3105 km SE of Nikolski, Alaska · 3698 days ago · 26 km deep · 81 km away
  4. 1.667 km SE of Unalaska, Alaska · 3701 days ago · 23 km deep · 99 km away
  5. 1.9113 km E of Nikolski, Alaska · 3701 days ago · 21 km deep · 62 km away
  6. 2.274 km SSW of Unalaska, Alaska · 3704 days ago · 58 km deep · 82 km away
  7. 1.894 km SE of Unalaska, Alaska · 3705 days ago · 12 km deep · 97 km away
  8. 2.4127 km S of Unalaska, Alaska · 3705 days ago · 16 km deep · 29 km away
  9. 2.196 km SSW of Unalaska, Alaska · 3706 days ago · 42 km deep · 61 km away
  10. 2.5200 km S of Unalaska, Alaska · 3706 days ago · 10 km deep · 56 km away
  11. 1.6128 km S of Unalaska, Alaska · 3707 days ago · 26 km deep · 22 km away
  12. 1.9120 km S of Unalaska, Alaska · 3708 days ago · 5 km deep · 35 km away
  13. 1.5104 km E of Nikolski, Alaska · 3709 days ago · 14 km deep · 73 km away
  14. 1.9148 km S of Unalaska, Alaska · 3710 days ago · 23 km deep · 4 km away
  15. 2.199 km S of Unalaska, Alaska · 3711 days ago · 16 km deep · 49 km away
  16. 2.4130 km S of Unalaska, Alaska · 3711 days ago · 15 km deep · 32 km away
  17. 2.3136 km S of Unalaska, Alaska · 3711 days ago · 39 km deep · 13 km away
  18. 2.2139 km S of Unalaska, Alaska · 3712 days ago · 37 km deep · 22 km away
  19. 1.9132 km S of Unalaska, Alaska · 3712 days ago · 6 km deep · 26 km away
  20. 1.668 km SSW of Unalaska, Alaska · 3712 days ago · 57 km deep · 88 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us10006nhn (also filed as ak016at0mkqj). Read Sun, Oct 4, 2026, 1:14 AM UTC.