Alaska earthquakes

M3.4 earthquake 120 km SSW of Atka, Alaska

A magnitude 3.4 earthquake struck 120 km SSW of Atka, Alaska on Wed, Aug 5, 2020, 1:06 PM HADT (22:06 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.3 76 km SW 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
3.4 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-08-05 22:06:46 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
51.190° N, 174.846° 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
3.4ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.128 · 8 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 3.5 km horizontally, 1.8 km in depth
Magnitude uncertainty
±0.13
Depth from
Operator assigned
Station coverage gap
257°, poorly surrounded by stations
Stations used
27

Nearby

Within 100 km, magnitude 1.5 and up: 96 in the 60 days after this one and 51 in the 30 days before it.

After

  1. 2.076 km SE of Adak, Alaska · 2247 days ago · 45 km deep · 69 km away
  2. 1.983 km ESE of Adak, Alaska · 2247 days ago · 23 km deep · 62 km away
  3. 1.965 km ESE of Adak, Alaska · 2246 days ago · 28 km deep · 80 km away
  4. 3.081 km E of Adak, Alaska · 2246 days ago · 63 km deep · 78 km away
  5. 1.660 km SSE of Atka, Alaska · 2246 days ago · 41 km deep · 100 km away
  6. 2.160 km SE of Adak, Alaska · 2246 days ago · 30 km deep · 87 km away
  7. 1.975 km S of Atka, Alaska · 2245 days ago · 5 km deep · 56 km away
  8. 1.687 km SW of Atka, Alaska · 2245 days ago · 23 km deep · 55 km away
  9. 1.926 km SW of Atka, Alaska · 2243 days ago · 74 km deep · 95 km away
  10. 1.993 km SW of Atka, Alaska · 2243 days ago · 25 km deep · 41 km away
  11. 2.6105 km S of Atka, Alaska · 2242 days ago · 35 km deep · 27 km away
  12. 2.0134 km S of Atka, Alaska · 2242 days ago · 7 km deep · 64 km away
  13. 1.859 km SE of Adak, Alaska · 2242 days ago · 53 km deep · 92 km away
  14. 1.783 km SSW of Atka, Alaska · 2242 days ago · 15 km deep · 41 km away
  15. 3.161 km SE of Adak, Alaska · 2241 days ago · 35 km deep · 86 km away
  16. 1.567 km SSE of Adak, Alaska · 2240 days ago · 19 km deep · 92 km away
  17. 1.757 km SSE of Adak, Alaska · 2239 days ago · 22 km deep · 99 km away
  18. 1.770 km SSW of Atka, Alaska · 2238 days ago · 26 km deep · 51 km away
  19. 1.658 km SW of Atka, Alaska · 2235 days ago · 58 km deep · 73 km away
  20. 3.1162 km SSW of Atka, Alaska · 2233 days ago · 25 km deep · 43 km away
  21. 1.824 km SSW of Atka, Alaska · 2233 days ago · 171 km deep · 96 km away
  22. 1.564 km SSE of Atka, Alaska · 2233 days ago · 3 km deep · 85 km away
  23. 1.867 km SE of Adak, Alaska · 2232 days ago · 25 km deep · 78 km away
  24. 1.587 km SW of Atka, Alaska · 2231 days ago · 28 km deep · 60 km away
  25. 2.668 km SSE of Atka, Alaska · 2230 days ago · 28 km deep · 90 km away
  26. 1.767 km SW of Atka, Alaska · 2230 days ago · 40 km deep · 66 km away
  27. 1.558 km SE of Adak, Alaska · 2230 days ago · 26 km deep · 94 km away
  28. 1.850 km S of Atka, Alaska · 2229 days ago · 26 km deep · 72 km away
  29. 3.054 km SW of Atka, Alaska · 2229 days ago · 75 km deep · 75 km away
  30. 2.679 km SW of Atka, Alaska · 2228 days ago · 25 km deep · 49 km away
  31. 1.6102 km ESE of Adak, Alaska · 2227 days ago · 30 km deep · 47 km away
  32. 1.5120 km SSW of Atka, Alaska · 2227 days ago · 9 km deep · 21 km away
  33. 1.540 km SSE of Atka, Alaska · 2227 days ago · 50 km deep · 91 km away
  34. 1.685 km WSW of Atka, Alaska · 2225 days ago · 59 km deep · 84 km away
  35. 2.7102 km ESE of Adak, Alaska · 2224 days ago · 35 km deep · 46 km away
  36. 1.596 km ESE of Adak, Alaska · 2224 days ago · 26 km deep · 52 km away
  37. 1.550 km ESE of Adak, Alaska · 2223 days ago · 50 km deep · 95 km away
  38. 1.794 km ESE of Adak, Alaska · 2223 days ago · 33 km deep · 60 km away
  39. 3.1162 km SSE of Atka, Alaska · 2221 days ago · 21 km deep · 99 km away
  40. 2.660 km S of Atka, Alaska · 2219 days ago · 35 km deep · 65 km away
  41. 1.766 km SW of Atka, Alaska · 2217 days ago · 9 km deep · 63 km away
  42. 1.793 km SSE of Adak, Alaska · 2216 days ago · 26 km deep · 98 km away
  43. 1.965 km SE of Adak, Alaska · 2216 days ago · 26 km deep · 82 km away
  44. 1.684 km WSW of Atka, Alaska · 2215 days ago · 72 km deep · 82 km away
  45. 1.858 km SSE of Adak, Alaska · 2215 days ago · 25 km deep · 97 km away
  46. 2.2148 km S of Atka, Alaska · 2214 days ago · 14 km deep · 72 km away
  47. 1.953 km SE of Adak, Alaska · 2212 days ago · 26 km deep · 98 km away
  48. 1.555 km SE of Adak, Alaska · 2212 days ago · 24 km deep · 96 km away
  49. 3.721 km S of Atka, Alaska · 2212 days ago · 71 km deep · 100 km away
  50. 1.875 km SE of Adak, Alaska · 2211 days ago · 23 km deep · 74 km away
  51. 1.982 km SE of Adak, Alaska · 2211 days ago · 26 km deep · 68 km away
  52. 2.787 km SE of Adak, Alaska · 2211 days ago · 26 km deep · 63 km away
  53. 2.7Andreanof Islands, Aleutian Islands, Alaska · 2211 days ago · 32 km deep · 82 km away
  54. 1.979 km SSW of Atka, Alaska · 2210 days ago · 13 km deep · 41 km away
  55. 1.679 km SE of Adak, Alaska · 2209 days ago · 22 km deep · 70 km away
  56. 1.587 km ESE of Adak, Alaska · 2209 days ago · 20 km deep · 59 km away
  57. 2.678 km WSW of Atka, Alaska · 2208 days ago · 251 km deep · 97 km away
  58. 1.739 km SW of Atka, Alaska · 2208 days ago · 75 km deep · 85 km away
  59. 1.651 km SE of Adak, Alaska · 2208 days ago · 45 km deep · 96 km away
  60. 3.875 km SE of Adak, Alaska · 2207 days ago · 26 km deep · 82 km away · felt by 1

The first 60 of 96.

Before

  1. 1.983 km SSE of Atka, Alaska · 2249 days ago · 19 km deep · 99 km away
  2. 1.689 km SW of Atka, Alaska · 2250 days ago · 26 km deep · 59 km away
  3. 3.5101 km SW of Atka, Alaska · 2250 days ago · 20 km deep · 41 km away
  4. 2.883 km SE of Adak, Alaska · 2252 days ago · 35 km deep · 63 km away
  5. 1.658 km ESE of Adak, Alaska · 2252 days ago · 23 km deep · 93 km away
  6. 2.067 km SSW of Atka, Alaska · 2252 days ago · 41 km deep · 55 km away
  7. 1.761 km SE of Adak, Alaska · 2253 days ago · 41 km deep · 90 km away
  8. 1.669 km SE of Adak, Alaska · 2253 days ago · 26 km deep · 79 km away
  9. 1.797 km ESE of Adak, Alaska · 2253 days ago · 27 km deep · 53 km away
  10. 3.648 km S of Atka, Alaska · 2254 days ago · 30 km deep · 74 km away
  11. 1.8141 km SSE of Atka, Alaska · 2256 days ago · 9 km deep · 97 km away
  12. 2.667 km WSW of Atka, Alaska · 2256 days ago · 10 km deep · 77 km away
  13. 2.779 km SW of Atka, Alaska · 2257 days ago · 23 km deep · 47 km away
  14. 1.646 km SSE of Atka, Alaska · 2257 days ago · 42 km deep · 98 km away
  15. 1.778 km SSE of Adak, Alaska · 2257 days ago · 26 km deep · 94 km away
  16. 2.185 km ESE of Adak, Alaska · 2259 days ago · 26 km deep · 60 km away
  17. 1.734 km S of Atka, Alaska · 2259 days ago · 56 km deep · 87 km away
  18. 2.263 km SSE of Atka, Alaska · 2261 days ago · 46 km deep · 82 km away
  19. 2.291 km SW of Atka, Alaska · 2262 days ago · 25 km deep · 54 km away
  20. 1.665 km SSW of Atka, Alaska · 2263 days ago · 22 km deep · 55 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bi3y (also filed as ak020a0wal5p). Read Thu, Oct 1, 2026, 7:03 PM UTC.