Alaska earthquakes

M2.8 earthquake 57 km SW of Atka, Alaska

A magnitude 2.8 earthquake struck 57 km SW of Atka, Alaska on Tue, Apr 21, 2020, 12:37 AM HADT (09:37 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.5 93 km SSE 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
2.8 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-04-21 09:37:45 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.803° N, 174.746° 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
2.8ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.148 · 6 stations
2.2ML, 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 5.5 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
233°, poorly surrounded by stations
Stations used
21

Nearby

Within 100 km, magnitude 1.5 and up: 118 in the 60 days after this one and 67 in the 30 days before it.

After

  1. 3.638 km WSW of Atka, Alaska · 2354 days ago · 82 km deep · 28 km away
  2. 2.272 km SE of Adak, Alaska · 2354 days ago · 27 km deep · 87 km away
  3. 1.763 km SE of Adak, Alaska · 2353 days ago · 24 km deep · 91 km away
  4. 1.937 km E of Atka, Alaska · 2352 days ago · 16 km deep · 85 km away
  5. 3.062 km SE of Adak, Alaska · 2352 days ago · 35 km deep · 91 km away
  6. 2.633 km NE of Atka, Alaska · 2352 days ago · 179 km deep · 91 km away
  7. 1.8114 km SW of Atka, Alaska · 2351 days ago · 31 km deep · 58 km away
  8. 3.261 km ESE of Atka, Alaska · 2351 days ago · 67 km deep · 95 km away
  9. 2.769 km SW of Atka, Alaska · 2351 days ago · 56 km deep · 16 km away
  10. 1.866 km SW of Atka, Alaska · 2351 days ago · 47 km deep · 18 km away
  11. 2.260 km W of Atka, Alaska · 2350 days ago · 235 km deep · 59 km away
  12. 1.797 km SE of Adak, Alaska · 2350 days ago · 19 km deep · 71 km away
  13. 1.939 km E of Atka, Alaska · 2350 days ago · 81 km deep · 86 km away
  14. 2.098 km ESE of Adak, Alaska · 2348 days ago · 25 km deep · 50 km away
  15. 1.897 km SW of Atka, Alaska · 2346 days ago · 26 km deep · 40 km away
  16. 1.659 km SSE of Atka, Alaska · 2345 days ago · 8 km deep · 53 km away
  17. 2.744 km N of Atka, Alaska · 2345 days ago · 156 km deep · 98 km away
  18. 2.289 km SE of Adak, Alaska · 2345 days ago · 27 km deep · 70 km away
  19. 1.974 km SE of Atka, Alaska · 2344 days ago · 106 km deep · 87 km away
  20. 2.662 km ESE of Adak, Alaska · 2344 days ago · 35 km deep · 80 km away
  21. 1.839 km E of Atka, Alaska · 2344 days ago · 5 km deep · 90 km away
  22. 1.777 km WSW of Atka, Alaska · 2343 days ago · 84 km deep · 45 km away
  23. 3.673 km ENE of Adak, Alaska · 2343 days ago · 142 km deep · 84 km away
  24. 2.242 km ENE of Atka, Alaska · 2343 days ago · 121 km deep · 95 km away
  25. 2.862 km ENE of Adak, Alaska · 2341 days ago · 193 km deep · 78 km away
  26. 3.14 km ESE of Atka, Alaska · 2340 days ago · 185 km deep · 59 km away
  27. 1.970 km SW of Atka, Alaska · 2339 days ago · 41 km deep · 16 km away
  28. 3.015 km NW of Atka, Alaska · 2339 days ago · 187 km deep · 60 km away
  29. 1.672 km WSW of Atka, Alaska · 2339 days ago · 70 km deep · 36 km away
  30. 1.8121 km SSW of Atka, Alaska · 2338 days ago · 21 km deep · 67 km away
  31. 3.130 km N of Atka, Alaska · 2338 days ago · 194 km deep · 83 km away
  32. 2.8104 km ESE of Adak, Alaska · 2338 days ago · 35 km deep · 61 km away
  33. 1.875 km E of Adak, Alaska · 2338 days ago · 162 km deep · 56 km away
  34. 1.8152 km SE of Adak, Alaska · 2337 days ago · 12 km deep · 100 km away
  35. 1.559 km WSW of Atka, Alaska · 2337 days ago · 53 km deep · 33 km away
  36. 3.169 km ESE of Adak, Alaska · 2336 days ago · 70 km deep · 63 km away
  37. 1.972 km SW of Atka, Alaska · 2335 days ago · 20 km deep · 15 km away
  38. 2.953 km SE of Adak, Alaska · 2335 days ago · 58 km deep · 89 km away
  39. 3.367 km NE of Adak, Alaska · 2335 days ago · 210 km deep · 100 km away
  40. 1.693 km ESE of Adak, Alaska · 2334 days ago · 35 km deep · 50 km away
  41. 3.664 km ESE of Atka, Alaska · 2331 days ago · 73 km deep · 100 km away
  42. 1.67 km S of Atka, Alaska · 2331 days ago · 14 km deep · 52 km away
  43. 2.554 km NE of Adak, Alaska · 2331 days ago · 173 km deep · 94 km away
  44. 2.595 km SSW of Atka, Alaska · 2331 days ago · 24 km deep · 41 km away
  45. 1.560 km SE of Adak, Alaska · 2331 days ago · 24 km deep · 99 km away
  46. 1.778 km SSE of Atka, Alaska · 2331 days ago · 25 km deep · 68 km away
  47. 3.399 km ESE of Adak, Alaska · 2330 days ago · 35 km deep · 46 km away
  48. 2.678 km SE of Adak, Alaska · 2329 days ago · 35 km deep · 75 km away
  49. 3.545 km NW of Atka, Alaska · 2329 days ago · 207 km deep · 82 km away
  50. 2.186 km SW of Atka, Alaska · 2329 days ago · 26 km deep · 29 km away
  51. 1.561 km SE of Adak, Alaska · 2329 days ago · 24 km deep · 93 km away
  52. 4.0100 km SW of Atka, Alaska · 2328 days ago · 40 km deep · 43 km away
  53. 4.593 km SSE of Atka, Alaska · 2328 days ago · 28 km deep · 93 km away
  54. 3.763 km ESE of Adak, Alaska · 2327 days ago · 53 km deep · 76 km away
  55. 3.791 km SSE of Atka, Alaska · 2327 days ago · 42 km deep · 92 km away
  56. 2.749 km NW of Atka, Alaska · 2326 days ago · 212 km deep · 78 km away
  57. 3.051 km NNW of Atka, Alaska · 2326 days ago · 158 km deep · 90 km away
  58. 2.868 km ESE of Atka, Alaska · 2326 days ago · 61 km deep · 96 km away
  59. 1.947 km SSW of Atka, Alaska · 2325 days ago · 28 km deep · 22 km away
  60. 2.989 km SSE of Atka, Alaska · 2325 days ago · 16 km deep · 88 km away

The first 60 of 118.

Before

  1. 2.6107 km SE of Adak, Alaska · 2355 days ago · 35 km deep · 70 km away
  2. 3.3105 km SE of Adak, Alaska · 2355 days ago · 28 km deep · 68 km away
  3. 2.966 km SW of Atka, Alaska · 2356 days ago · 72 km deep · 16 km away
  4. 1.695 km SE of Adak, Alaska · 2356 days ago · 25 km deep · 71 km away
  5. 3.0121 km SSW of Atka, Alaska · 2356 days ago · 12 km deep · 68 km away
  6. 2.870 km ENE of Adak, Alaska · 2357 days ago · 113 km deep · 77 km away
  7. 1.568 km SE of Adak, Alaska · 2357 days ago · 26 km deep · 87 km away
  8. 2.655 km S of Atka, Alaska · 2358 days ago · 35 km deep · 45 km away
  9. 2.563 km SE of Adak, Alaska · 2358 days ago · 35 km deep · 93 km away
  10. 2.424 km NW of Atka, Alaska · 2358 days ago · 171 km deep · 66 km away
  11. 2.789 km SW of Atka, Alaska · 2358 days ago · 28 km deep · 32 km away
  12. 2.334 km NNE of Atka, Alaska · 2359 days ago · 118 km deep · 91 km away
  13. 2.7131 km SSW of Atka, Alaska · 2360 days ago · 24 km deep · 80 km away
  14. 2.9129 km SSW of Atka, Alaska · 2360 days ago · 10 km deep · 77 km away
  15. 2.7130 km SSW of Atka, Alaska · 2360 days ago · 18 km deep · 78 km away
  16. 2.945 km ENE of Adak, Alaska · 2360 days ago · 148 km deep · 89 km away
  17. 2.013 km N of Atka, Alaska · 2360 days ago · 4 km deep · 67 km away
  18. 3.4123 km SSW of Atka, Alaska · 2360 days ago · 15 km deep · 70 km away
  19. 3.7106 km SSW of Atka, Alaska · 2360 days ago · 35 km deep · 50 km away
  20. 3.388 km SE of Adak, Alaska · 2360 days ago · 35 km deep · 85 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000915s (also filed as ak02055drt9e). Read Thu, Oct 1, 2026, 9:04 PM UTC.