Alaska earthquakes

M4.0 earthquake 11 km WSW of Atka, Alaska

A magnitude 4.0 earthquake struck 11 km WSW of Atka, Alaska on Sat, Jul 20, 2019, 1:57 AM HADT (10:57 UTC), 178 km (110 mi) below the surface.

A larger quake followed: M4.7 92 km SSW 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
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-07-20 10:57:24 UTC
Depth
177.8 km (110.5 mi), intermediate-depth
Epicenter
52.145° N, 174.350° 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
4.0mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.064 · 65 stations
3.2ML, 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 11.7 km horizontally, 8.9 km in depth
Magnitude uncertainty
±0.06
Depth from
From location
Station coverage gap
184°, poorly surrounded by stations
Stations used
118

Nearby

Within 100 km, magnitude 1.5 and up: 101 in the 60 days after this one and 47 in the 30 days before it.

After

  1. 3.732 km NNE of Atka, Alaska · 2630 days ago · 163 km deep · 43 km away
  2. 2.032 km SW of Atka, Alaska · 2630 days ago · 78 km deep · 22 km away
  3. 1.755 km WSW of Atka, Alaska · 2630 days ago · 68 km deep · 44 km away
  4. 2.177 km ESE of Atka, Alaska · 2630 days ago · 83 km deep · 85 km away
  5. 1.8102 km SW of Atka, Alaska · 2629 days ago · 41 km deep · 92 km away
  6. 1.7100 km ESE of Adak, Alaska · 2629 days ago · 28 km deep · 89 km away
  7. 1.931 km SW of Atka, Alaska · 2627 days ago · 88 km deep · 21 km away
  8. 1.5Andreanof Islands, Aleutian Islands, Alaska · 2627 days ago · 53 km deep · 66 km away
  9. 2.779 km ESE of Atka, Alaska · 2626 days ago · 35 km deep · 85 km away
  10. 2.774 km NNW of Atka, Alaska · 2626 days ago · 196 km deep · 76 km away
  11. 2.944 km N of Atka, Alaska · 2626 days ago · 179 km deep · 51 km away
  12. 1.661 km SW of Atka, Alaska · 2624 days ago · 45 km deep · 50 km away
  13. 4.4106 km SSW of Atka, Alaska · 2624 days ago · 26 km deep · 97 km away
  14. 4.792 km SSW of Atka, Alaska · 2624 days ago · 25 km deep · 83 km away
  15. 2.17 km SSW of Atka, Alaska · 2623 days ago · 141 km deep · 8 km away
  16. 1.590 km SW of Atka, Alaska · 2623 days ago · 25 km deep · 79 km away
  17. 2.057 km W of Atka, Alaska · 2623 days ago · 86 km deep · 47 km away
  18. 3.796 km SSW of Atka, Alaska · 2623 days ago · 35 km deep · 87 km away
  19. 2.174 km SE of Atka, Alaska · 2623 days ago · 28 km deep · 80 km away
  20. 1.797 km SW of Atka, Alaska · 2621 days ago · 25 km deep · 86 km away
  21. 3.746 km S of Atka, Alaska · 2617 days ago · 46 km deep · 41 km away
  22. 2.024 km SW of Atka, Alaska · 2617 days ago · 63 km deep · 14 km away
  23. 2.633 km NW of Atka, Alaska · 2617 days ago · 174 km deep · 33 km away
  24. 1.749 km SW of Atka, Alaska · 2615 days ago · 66 km deep · 37 km away
  25. 2.294 km SW of Atka, Alaska · 2615 days ago · 25 km deep · 84 km away
  26. 2.879 km SE of Atka, Alaska · 2615 days ago · 35 km deep · 85 km away
  27. 2.171 km ENE of Adak, Alaska · 2615 days ago · 152 km deep · 89 km away
  28. 2.054 km ESE of Atka, Alaska · 2613 days ago · 55 km deep · 61 km away
  29. 2.116 km SSE of Atka, Alaska · 2613 days ago · 131 km deep · 19 km away
  30. 2.37 km NNW of Atka, Alaska · 2612 days ago · 219 km deep · 14 km away
  31. 2.827 km SSW of Atka, Alaska · 2611 days ago · 76 km deep · 20 km away
  32. 2.4107 km SW of Atka, Alaska · 2610 days ago · 35 km deep · 97 km away
  33. 2.015 km SSW of Atka, Alaska · 2610 days ago · 66 km deep · 10 km away
  34. 2.561 km ENE of Adak, Alaska · 2609 days ago · 214 km deep · 98 km away
  35. 3.786 km ESE of Atka, Alaska · 2608 days ago · 27 km deep · 93 km away
  36. 2.066 km ESE of Atka, Alaska · 2608 days ago · 56 km deep · 73 km away
  37. 2.224 km NW of Atka, Alaska · 2608 days ago · 172 km deep · 25 km away
  38. 2.6103 km SSW of Atka, Alaska · 2607 days ago · 10 km deep · 97 km away
  39. 1.880 km ESE of Atka, Alaska · 2607 days ago · 34 km deep · 87 km away
  40. 2.521 km ENE of Atka, Alaska · 2607 days ago · 148 km deep · 33 km away
  41. 1.892 km SW of Atka, Alaska · 2606 days ago · 39 km deep · 82 km away
  42. 2.263 km NNW of Atka, Alaska · 2606 days ago · 216 km deep · 65 km away
  43. 1.897 km S of Atka, Alaska · 2606 days ago · 66 km deep · 92 km away
  44. 1.973 km SW of Atka, Alaska · 2606 days ago · 40 km deep · 62 km away
  45. 2.350 km SSW of Atka, Alaska · 2604 days ago · 5 km deep · 42 km away
  46. 1.785 km SW of Atka, Alaska · 2601 days ago · 26 km deep · 74 km away
  47. 3.264 km NE of Atka, Alaska · 2600 days ago · 21 km deep · 75 km away
  48. 2.534 km ESE of Atka, Alaska · 2597 days ago · 12 km deep · 43 km away
  49. 4.270 km ENE of Atka, Alaska · 2597 days ago · 14 km deep · 82 km away
  50. 2.580 km ESE of Adak, Alaska · 2596 days ago · 35 km deep · 94 km away
  51. 1.584 km E of Adak, Alaska · 2595 days ago · 48 km deep · 81 km away
  52. 3.388 km S of Atka, Alaska · 2595 days ago · 23 km deep · 84 km away
  53. 2.055 km NE of Atka, Alaska · 2594 days ago · 25 km deep · 66 km away
  54. 1.659 km NE of Atka, Alaska · 2594 days ago · 65 km deep · 71 km away
  55. 1.825 km NNE of Atka, Alaska · 2594 days ago · 139 km deep · 35 km away
  56. 1.661 km E of Atka, Alaska · 2594 days ago · 20 km deep · 71 km away
  57. 1.870 km SW of Atka, Alaska · 2593 days ago · 22 km deep · 60 km away
  58. 1.967 km SW of Atka, Alaska · 2593 days ago · 25 km deep · 56 km away
  59. 1.527 km W of Atka, Alaska · 2593 days ago · 7 km deep · 17 km away
  60. 2.230 km N of Atka, Alaska · 2593 days ago · 213 km deep · 38 km away

The first 60 of 101.

Before

  1. 1.670 km WSW of Atka, Alaska · 2630 days ago · 77 km deep · 59 km away
  2. 2.258 km SE of Atka, Alaska · 2631 days ago · 15 km deep · 62 km away
  3. 2.467 km S of Atka, Alaska · 2631 days ago · 10 km deep · 62 km away
  4. 1.86 km WNW of Atka, Alaska · 2632 days ago · 188 km deep · 9 km away
  5. 2.5100 km SW of Atka, Alaska · 2632 days ago · 35 km deep · 90 km away
  6. 4.099 km SW of Atka, Alaska · 2633 days ago · 35 km deep · 88 km away
  7. 2.359 km W of Atka, Alaska · 2633 days ago · 117 km deep · 50 km away
  8. 2.656 km NNW of Atka, Alaska · 2635 days ago · 177 km deep · 61 km away
  9. 1.644 km S of Atka, Alaska · 2635 days ago · 20 km deep · 41 km away
  10. 2.147 km NNE of Atka, Alaska · 2636 days ago · 162 km deep · 57 km away
  11. 1.842 km S of Atka, Alaska · 2637 days ago · 47 km deep · 38 km away
  12. 2.470 km SSW of Atka, Alaska · 2637 days ago · 35 km deep · 62 km away
  13. 1.747 km SW of Atka, Alaska · 2639 days ago · 64 km deep · 37 km away
  14. 2.167 km NW of Atka, Alaska · 2639 days ago · 211 km deep · 66 km away
  15. 3.422 km N of Atka, Alaska · 2640 days ago · 162 km deep · 28 km away
  16. 1.883 km SSE of Atka, Alaska · 2640 days ago · 35 km deep · 85 km away
  17. 1.667 km E of Adak, Alaska · 2640 days ago · 84 km deep · 93 km away
  18. 1.831 km ESE of Atka, Alaska · 2640 days ago · 123 km deep · 39 km away
  19. 2.763 km E of Atka, Alaska · 2642 days ago · 14 km deep · 74 km away
  20. 1.591 km SW of Atka, Alaska · 2643 days ago · 26 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us600054e4 (also filed as ak01998lbcyg). Read Thu, Oct 1, 2026, 6:29 PM UTC.