Alaska earthquakes

M2.1 earthquake 72 km WSW of Unalaska, Alaska

A magnitude 2.1 earthquake struck 72 km WSW of Unalaska, Alaska on Fri, Apr 20, 2018, 7:01 PM AKDT (03:01 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M4.4 89 km E of Nikolski, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
2.1 (ML, local (Richter)), micro
Magnitude from
Alaska Earthquake Center
Local time
UTC
2018-04-21 03:01:47 UTC
Depth
7.9 km (4.9 mi), shallow
Epicenter
53.563° N, 167.497° 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
2.1ML, local (Richter)Alaska Earthquake CenterPreferred · Preliminary
2.04ML, local (Richter)AVFinal · ±0.254 · 13 stations

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used
28

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 64 in the 60 days after this one and 34 in the 30 days before it.

After

  1. 1.8Fox Islands, Aleutian Islands, Alaska · 3088 days ago · 34 km deep · 62 km away
  2. 2.767 km SW of Unalaska, Alaska · 3086 days ago · 87 km deep · 29 km away
  3. 2.350 km SSW of Unalaska, Alaska · 3085 days ago · 67 km deep · 40 km away
  4. 3.487 km SSW of Unalaska, Alaska · 3082 days ago · 80 km deep · 59 km away
  5. 1.895 km SW of Unalaska, Alaska · 3082 days ago · 40 km deep · 41 km away
  6. 3.998 km SSW of Unalaska, Alaska · 3081 days ago · 45 km deep · 68 km away
  7. 2.392 km SSW of Unalaska, Alaska · 3081 days ago · 21 km deep · 63 km away
  8. 1.891 km SSW of Unalaska, Alaska · 3081 days ago · 26 km deep · 65 km away
  9. 2.391 km SSW of Unalaska, Alaska · 3081 days ago · 49 km deep · 46 km away
  10. 1.657 km SW of Unalaska, Alaska · 3079 days ago · 14 km deep · 18 km away
  11. 1.786 km SW of Unalaska, Alaska · 3076 days ago · 43 km deep · 38 km away
  12. 1.924 km SSE of Unalaska, Alaska · 3074 days ago · 76 km deep · 71 km away
  13. 2.5107 km E of Nikolski, Alaska · 3074 days ago · 35 km deep · 71 km away
  14. 2.184 km E of Nikolski, Alaska · 3074 days ago · 62 km deep · 81 km away
  15. 1.73 km WNW of Dutch Harbor, Alaska · 3073 days ago · 12 km deep · 70 km away
  16. 1.884 km SW of Unalaska, Alaska · 3071 days ago · 37 km deep · 33 km away
  17. 3.388 km S of Unalaska, Alaska · 3071 days ago · 37 km deep · 73 km away
  18. 1.675 km SW of Unalaska, Alaska · 3070 days ago · 13 km deep · 21 km away
  19. 2.848 km ESE of Nikolski, Alaska · 3069 days ago · 35 km deep · 90 km away
  20. 1.839 km SSW of Unalaska, Alaska · 3069 days ago · 75 km deep · 52 km away
  21. 1.999 km E of Nikolski, Alaska · 3068 days ago · 47 km deep · 70 km away
  22. 2.079 km SSW of Unalaska, Alaska · 3067 days ago · 26 km deep · 61 km away
  23. 1.526 km SE of Unalaska, Alaska · 3067 days ago · 69 km deep · 87 km away
  24. 2.042 km SE of Unalaska, Alaska · 3064 days ago · 35 km deep · 90 km away
  25. 4.489 km E of Nikolski, Alaska · 3062 days ago · 47 km deep · 68 km away · felt by 1
  26. 2.897 km E of Nikolski, Alaska · 3062 days ago · 22 km deep · 76 km away
  27. 4.495 km E of Nikolski, Alaska · 3061 days ago · 47 km deep · 68 km away
  28. 2.375 km ESE of Nikolski, Alaska · 3061 days ago · 26 km deep · 97 km away
  29. 2.067 km SW of Unalaska, Alaska · 3059 days ago · 8 km deep · 16 km away
  30. 1.735 km SSW of Unalaska, Alaska · 3055 days ago · 81 km deep · 46 km away
  31. 2.270 km S of Unalaska, Alaska · 3055 days ago · 42 km deep · 62 km away
  32. 1.935 km ESE of Nikolski, Alaska · 3055 days ago · 47 km deep · 99 km away
  33. 3.393 km SSW of Unalaska, Alaska · 3054 days ago · 19 km deep · 65 km away
  34. 1.858 km SW of Unalaska, Alaska · 3049 days ago · 16 km deep · 21 km away
  35. 3.953 km SSE of Unalaska, Alaska · 3049 days ago · 41 km deep · 78 km away
  36. 3.9119 km E of Nikolski, Alaska · 3048 days ago · 47 km deep · 93 km away
  37. 3.634 km SSE of Unalaska, Alaska · 3047 days ago · 78 km deep · 77 km away
  38. 3.570 km ENE of Nikolski, Alaska · 3046 days ago · 70 km deep · 58 km away
  39. 2.880 km S of Unalaska, Alaska · 3045 days ago · 41 km deep · 68 km away
  40. 1.918 km SW of Unalaska, Alaska · 3045 days ago · 10 km deep · 54 km away
  41. 2.065 km SW of Unalaska, Alaska · 3045 days ago · 98 km deep · 15 km away
  42. 1.954 km SE of Unalaska, Alaska · 3042 days ago · 26 km deep · 98 km away
  43. 1.656 km SSE of Unalaska, Alaska · 3042 days ago · 39 km deep · 96 km away
  44. 1.770 km SW of Unalaska, Alaska · 3042 days ago · 22 km deep · 18 km away
  45. 3.071 km S of Unalaska, Alaska · 3039 days ago · 49 km deep · 62 km away
  46. 2.692 km S of Unalaska, Alaska · 3039 days ago · 10 km deep · 83 km away
  47. 1.974 km E of Nikolski, Alaska · 3038 days ago · 35 km deep · 72 km away
  48. 3.570 km S of Unalaska, Alaska · 3038 days ago · 47 km deep · 85 km away
  49. 2.075 km S of Unalaska, Alaska · 3037 days ago · 19 km deep · 65 km away
  50. 1.853 km SW of Unalaska, Alaska · 3036 days ago · 14 km deep · 23 km away
  51. 2.1113 km SSW of Unalaska, Alaska · 3035 days ago · 10 km deep · 78 km away
  52. 1.953 km SW of Unalaska, Alaska · 3035 days ago · 18 km deep · 22 km away
  53. 1.652 km SW of Unalaska, Alaska · 3035 days ago · 15 km deep · 27 km away
  54. 1.555 km SW of Unalaska, Alaska · 3034 days ago · 14 km deep · 19 km away
  55. 2.46 km WSW of Unalaska, Alaska · 3033 days ago · 103 km deep · 66 km away
  56. 2.161 km SW of Unalaska, Alaska · 3031 days ago · 13 km deep · 13 km away
  57. 1.738 km SW of Unalaska, Alaska · 3031 days ago · 15 km deep · 36 km away
  58. 2.535 km NNE of Dutch Harbor, Alaska · 3031 days ago · 188 km deep · 100 km away
  59. 2.791 km SSW of Unalaska, Alaska · 3030 days ago · 29 km deep · 57 km away
  60. 2.489 km SSW of Unalaska, Alaska · 3030 days ago · 26 km deep · 57 km away

The first 60 of 64.

Before

  1. 1.984 km SSW of Unalaska, Alaska · 3089 days ago · 40 km deep · 56 km away
  2. 3.352 km S of Unalaska, Alaska · 3090 days ago · 38 km deep · 64 km away
  3. 2.652 km SSE of Unalaska, Alaska · 3093 days ago · 63 km deep · 88 km away
  4. 1.770 km SW of Unalaska, Alaska · 3095 days ago · 20 km deep · 10 km away
  5. 1.958 km SW of Unalaska, Alaska · 3095 days ago · 78 km deep · 28 km away
  6. 1.944 km SE of Unalaska, Alaska · 3095 days ago · 26 km deep · 95 km away
  7. 2.157 km SSE of Unalaska, Alaska · 3096 days ago · 26 km deep · 84 km away
  8. 2.252 km ESE of Nikolski, Alaska · 3097 days ago · 38 km deep · 90 km away
  9. 1.695 km SSW of Unalaska, Alaska · 3101 days ago · 15 km deep · 59 km away
  10. 2.147 km NE of Nikolski, Alaska · 3101 days ago · 14 km deep · 68 km away
  11. 1.647 km NE of Nikolski, Alaska · 3101 days ago · 7 km deep · 69 km away
  12. 1.647 km NE of Nikolski, Alaska · 3101 days ago · 9 km deep · 67 km away
  13. 1.991 km SSW of Unalaska, Alaska · 3102 days ago · 26 km deep · 65 km away
  14. 1.848 km NE of Nikolski, Alaska · 3102 days ago · 14 km deep · 67 km away
  15. 2.252 km NE of Nikolski, Alaska · 3102 days ago · 5 km deep · 64 km away
  16. 1.849 km NE of Nikolski, Alaska · 3102 days ago · 7 km deep · 64 km away
  17. 2.151 km NE of Nikolski, Alaska · 3102 days ago · 7 km deep · 64 km away
  18. 2.248 km NE of Nikolski, Alaska · 3102 days ago · 8 km deep · 66 km away
  19. 3.380 km NE of Nikolski, Alaska · 3103 days ago · 79 km deep · 41 km away
  20. 1.571 km SW of Unalaska, Alaska · 3104 days ago · 13 km deep · 8 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak01853mg4z9 (also filed as ak19247637, av61700131). Read Sun, Oct 4, 2026, 5:32 PM UTC.