Alaska earthquakes

M3.5 earthquake 91 km SW of Atka, Alaska

A magnitude 3.5 earthquake struck 91 km SW of Atka, Alaska on Fri, Mar 20, 2020, 2:44 AM HADT (11:44 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.8 117 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
3.5 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-03-20 11:44:39 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.632° N, 175.167° 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
3.5mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.22 · 5 stations
3.0ML, 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 3.0 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.22
Depth from
Operator assigned
Station coverage gap
204°, poorly surrounded by stations
Stations used
37

Nearby

Within 100 km, magnitude 1.5 and up: 138 in the 60 days after this one and 71 in the 30 days before it.

After

  1. 1.811 km N of Atka, Alaska · 2389 days ago · 4 km deep · 100 km away
  2. 1.756 km SE of Adak, Alaska · 2388 days ago · 27 km deep · 62 km away
  3. 2.760 km SE of Adak, Alaska · 2387 days ago · 36 km deep · 67 km away
  4. 2.239 km ESE of Adak, Alaska · 2387 days ago · 133 km deep · 66 km away
  5. 2.9109 km SW of Atka, Alaska · 2386 days ago · 14 km deep · 25 km away
  6. 4.8117 km SSW of Atka, Alaska · 2386 days ago · 20 km deep · 37 km away
  7. 1.641 km ENE of Adak, Alaska · 2386 days ago · 3 km deep · 80 km away
  8. 2.868 km SE of Adak, Alaska · 2385 days ago · 31 km deep · 67 km away
  9. 2.664 km SE of Adak, Alaska · 2385 days ago · 36 km deep · 61 km away
  10. 2.062 km SE of Adak, Alaska · 2385 days ago · 22 km deep · 64 km away
  11. 2.548 km SE of Adak, Alaska · 2383 days ago · 37 km deep · 64 km away
  12. 1.936 km SSE of Atka, Alaska · 2383 days ago · 7 km deep · 88 km away
  13. 2.858 km SSE of Adak, Alaska · 2382 days ago · 35 km deep · 87 km away
  14. 2.633 km S of Atka, Alaska · 2382 days ago · 84 km deep · 71 km away
  15. 1.743 km ENE of Adak, Alaska · 2382 days ago · 8 km deep · 76 km away
  16. 1.855 km ESE of Adak, Alaska · 2382 days ago · 37 km deep · 53 km away
  17. 2.322 km NNW of Atka, Alaska · 2380 days ago · 98 km deep · 98 km away
  18. 2.687 km SSW of Atka, Alaska · 2379 days ago · 32 km deep · 38 km away
  19. 1.741 km ENE of Adak, Alaska · 2379 days ago · 4 km deep · 81 km away
  20. 1.632 km WSW of Atka, Alaska · 2378 days ago · 75 km deep · 61 km away
  21. 1.534 km ESE of Adak, Alaska · 2378 days ago · 72 km deep · 70 km away
  22. 1.765 km SE of Adak, Alaska · 2378 days ago · 27 km deep · 69 km away
  23. 3.824 km SE of Atka, Alaska · 2377 days ago · 191 km deep · 91 km away
  24. 1.731 km SW of Atka, Alaska · 2376 days ago · 68 km deep · 59 km away
  25. 2.144 km ENE of Adak, Alaska · 2375 days ago · 9 km deep · 76 km away
  26. 3.057 km SSW of Atka, Alaska · 2374 days ago · 69 km deep · 41 km away
  27. 2.054 km SSE of Adak, Alaska · 2374 days ago · 25 km deep · 76 km away
  28. 2.872 km SW of Atka, Alaska · 2374 days ago · 26 km deep · 22 km away
  29. 3.130 km W of Atka, Alaska · 2373 days ago · 218 km deep · 69 km away
  30. 1.564 km SE of Adak, Alaska · 2372 days ago · 23 km deep · 62 km away
  31. 1.942 km WSW of Atka, Alaska · 2371 days ago · 13 km deep · 54 km away
  32. 1.983 km E of Adak, Alaska · 2371 days ago · 83 km deep · 39 km away
  33. 1.646 km SW of Atka, Alaska · 2371 days ago · 13 km deep · 46 km away
  34. 2.246 km NE of Adak, Alaska · 2371 days ago · 208 km deep · 85 km away
  35. 2.677 km SE of Adak, Alaska · 2369 days ago · 34 km deep · 54 km away
  36. 2.587 km SE of Adak, Alaska · 2368 days ago · 29 km deep · 43 km away
  37. 2.652 km SSE of Adak, Alaska · 2368 days ago · 35 km deep · 79 km away
  38. 2.042 km ENE of Adak, Alaska · 2368 days ago · 7 km deep · 76 km away
  39. 2.891 km S of Atka, Alaska · 2366 days ago · 4 km deep · 83 km away
  40. 3.487 km NE of Adak, Alaska · 2366 days ago · 220 km deep · 90 km away
  41. 1.642 km WSW of Atka, Alaska · 2366 days ago · 14 km deep · 52 km away
  42. 1.9Andreanof Islands, Aleutian Islands, Alaska · 2366 days ago · 5 km deep · 80 km away
  43. 1.842 km SSE of Adak, Alaska · 2365 days ago · 32 km deep · 83 km away
  44. 1.817 km NW of Atka, Alaska · 2365 days ago · 9 km deep · 90 km away
  45. 3.092 km SW of Atka, Alaska · 2365 days ago · 35 km deep · 1 km away
  46. 1.687 km SSW of Atka, Alaska · 2364 days ago · 26 km deep · 43 km away
  47. 2.167 km ENE of Adak, Alaska · 2364 days ago · 151 km deep · 78 km away
  48. 3.388 km SE of Adak, Alaska · 2364 days ago · 35 km deep · 51 km away
  49. 3.7106 km SSW of Atka, Alaska · 2364 days ago · 35 km deep · 29 km away
  50. 3.4123 km SSW of Atka, Alaska · 2363 days ago · 15 km deep · 53 km away
  51. 2.013 km N of Atka, Alaska · 2363 days ago · 4 km deep · 100 km away
  52. 2.945 km ENE of Adak, Alaska · 2363 days ago · 148 km deep · 71 km away
  53. 2.7130 km SSW of Atka, Alaska · 2363 days ago · 18 km deep · 60 km away
  54. 2.9129 km SSW of Atka, Alaska · 2363 days ago · 10 km deep · 60 km away
  55. 2.7131 km SSW of Atka, Alaska · 2363 days ago · 24 km deep · 64 km away
  56. 2.063 km SSE of Adak, Alaska · 2363 days ago · 26 km deep · 93 km away
  57. 1.655 km SSE of Adak, Alaska · 2362 days ago · 23 km deep · 84 km away
  58. 2.789 km SW of Atka, Alaska · 2362 days ago · 28 km deep · 3 km away
  59. 2.424 km NW of Atka, Alaska · 2362 days ago · 171 km deep · 95 km away
  60. 2.563 km SE of Adak, Alaska · 2361 days ago · 35 km deep · 59 km away

The first 60 of 138.

Before

  1. 1.995 km ESE of Adak, Alaska · 2390 days ago · 30 km deep · 12 km away
  2. 2.718 km SSE of Adak, Alaska · 2391 days ago · 69 km deep · 94 km away
  3. 1.968 km SE of Adak, Alaska · 2393 days ago · 25 km deep · 59 km away
  4. 2.845 km W of Atka, Alaska · 2393 days ago · 247 km deep · 66 km away
  5. 3.023 km WSW of Atka, Alaska · 2393 days ago · 184 km deep · 69 km away
  6. 1.641 km E of Adak, Alaska · 2394 days ago · 72 km deep · 65 km away
  7. 2.6108 km SE of Adak, Alaska · 2394 days ago · 28 km deep · 40 km away
  8. 1.920 km ESE of Adak, Alaska · 2395 days ago · 70 km deep · 85 km away
  9. 2.074 km E of Adak, Alaska · 2396 days ago · 88 km deep · 50 km away
  10. 1.924 km WNW of Atka, Alaska · 2396 days ago · 76 km deep · 84 km away
  11. 2.541 km ENE of Adak, Alaska · 2397 days ago · 2 km deep · 81 km away
  12. 2.341 km ENE of Adak, Alaska · 2397 days ago · 5 km deep · 80 km away
  13. 1.961 km SE of Adak, Alaska · 2397 days ago · 22 km deep · 69 km away
  14. 2.965 km ESE of Adak, Alaska · 2397 days ago · 35 km deep · 46 km away
  15. 2.837 km W of Atka, Alaska · 2399 days ago · 85 km deep · 65 km away
  16. 2.858 km SSE of Adak, Alaska · 2399 days ago · 35 km deep · 74 km away
  17. 2.944 km S of Adak, Alaska · 2400 days ago · 35 km deep · 100 km away
  18. 1.669 km SSE of Adak, Alaska · 2400 days ago · 26 km deep · 89 km away
  19. 1.784 km SE of Adak, Alaska · 2400 days ago · 26 km deep · 37 km away
  20. 3.089 km SSW of Atka, Alaska · 2402 days ago · 42 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008h05 (also filed as ak0203oht1rx). Read Mon, Oct 5, 2026, 7:28 AM UTC.