Alaska earthquakes

M3.5 earthquake 101 km SW of Atka, Alaska

A magnitude 3.5 earthquake struck 101 km SW of Atka, Alaska on Mon, Aug 3, 2020, 8:58 AM HADT (17:58 UTC), 20 km (12 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
3.5 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-08-03 17:58:35 UTC
Depth
19.9 km (12.4 mi), shallow
Epicenter
51.502° N, 175.159° 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
3.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.115 · 10 stations
3.1ML, 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 5.6 km horizontally, 5.3 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
215°, poorly surrounded by stations
Stations used
30

Nearby

Within 100 km, magnitude 1.5 and up: 143 in the 60 days after this one and 84 in the 30 days before it.

After

  1. 1.665 km SSE of Adak, Alaska · 2250 days ago · 20 km deep · 87 km away
  2. 1.689 km SW of Atka, Alaska · 2250 days ago · 26 km deep · 20 km away
  3. 3.4120 km SSW of Atka, Alaska · 2248 days ago · 10 km deep · 41 km away
  4. 2.076 km SE of Adak, Alaska · 2248 days ago · 45 km deep · 41 km away
  5. 1.983 km ESE of Adak, Alaska · 2247 days ago · 23 km deep · 32 km away
  6. 1.539 km SSE of Adak, Alaska · 2247 days ago · 35 km deep · 85 km away
  7. 1.965 km ESE of Adak, Alaska · 2247 days ago · 28 km deep · 46 km away
  8. 2.914 km W of Atka, Alaska · 2247 days ago · 188 km deep · 94 km away
  9. 3.081 km E of Adak, Alaska · 2247 days ago · 63 km deep · 37 km away
  10. 2.120 km WNW of Atka, Alaska · 2246 days ago · 177 km deep · 95 km away
  11. 2.160 km SE of Adak, Alaska · 2246 days ago · 30 km deep · 59 km away
  12. 1.975 km S of Atka, Alaska · 2246 days ago · 5 km deep · 64 km away
  13. 1.687 km SW of Atka, Alaska · 2245 days ago · 23 km deep · 17 km away
  14. 1.926 km SW of Atka, Alaska · 2244 days ago · 74 km deep · 75 km away
  15. 2.631 km W of Atka, Alaska · 2244 days ago · 35 km deep · 84 km away
  16. 1.993 km SW of Atka, Alaska · 2243 days ago · 25 km deep · 10 km away
  17. 2.6105 km S of Atka, Alaska · 2243 days ago · 35 km deep · 54 km away
  18. 2.0134 km S of Atka, Alaska · 2243 days ago · 7 km deep · 99 km away
  19. 1.859 km SE of Adak, Alaska · 2243 days ago · 53 km deep · 65 km away
  20. 1.783 km SSW of Atka, Alaska · 2242 days ago · 15 km deep · 50 km away
  21. 2.484 km W of Atka, Alaska · 2242 days ago · 242 km deep · 76 km away
  22. 1.920 km WSW of Atka, Alaska · 2242 days ago · 164 km deep · 82 km away
  23. 3.161 km SE of Adak, Alaska · 2241 days ago · 35 km deep · 55 km away
  24. 1.618 km SE of Adak, Alaska · 2241 days ago · 67 km deep · 93 km away
  25. 1.567 km SSE of Adak, Alaska · 2241 days ago · 19 km deep · 71 km away
  26. 1.757 km SSE of Adak, Alaska · 2239 days ago · 22 km deep · 74 km away
  27. 2.067 km NE of Adak, Alaska · 2239 days ago · 176 km deep · 94 km away
  28. 1.770 km SSW of Atka, Alaska · 2239 days ago · 26 km deep · 37 km away
  29. 2.842 km ENE of Adak, Alaska · 2237 days ago · 159 km deep · 85 km away
  30. 1.773 km W of Atka, Alaska · 2237 days ago · 86 km deep · 67 km away
  31. 1.658 km SW of Atka, Alaska · 2236 days ago · 58 km deep · 44 km away
  32. 3.971 km NE of Adak, Alaska · 2236 days ago · 154 km deep · 100 km away
  33. 3.638 km SE of Adak, Alaska · 2236 days ago · 68 km deep · 73 km away
  34. 1.835 km ENE of Adak, Alaska · 2235 days ago · 128 km deep · 91 km away
  35. 3.1162 km SSW of Atka, Alaska · 2233 days ago · 25 km deep · 80 km away
  36. 1.824 km SSW of Atka, Alaska · 2233 days ago · 171 km deep · 78 km away
  37. 1.564 km SSE of Atka, Alaska · 2233 days ago · 3 km deep · 90 km away
  38. 1.953 km ENE of Adak, Alaska · 2233 days ago · 218 km deep · 86 km away
  39. 1.867 km SE of Adak, Alaska · 2233 days ago · 25 km deep · 46 km away
  40. 2.99 km WSW of Atka, Alaska · 2232 days ago · 222 km deep · 94 km away
  41. 1.587 km SW of Atka, Alaska · 2232 days ago · 28 km deep · 21 km away
  42. 2.668 km SSE of Atka, Alaska · 2231 days ago · 28 km deep · 97 km away
  43. 1.767 km SW of Atka, Alaska · 2231 days ago · 40 km deep · 35 km away
  44. 2.018 km ESE of Adak, Alaska · 2231 days ago · 80 km deep · 92 km away
  45. 1.558 km SE of Adak, Alaska · 2230 days ago · 26 km deep · 68 km away
  46. 2.770 km ENE of Adak, Alaska · 2230 days ago · 152 km deep · 81 km away
  47. 1.850 km S of Atka, Alaska · 2230 days ago · 26 km deep · 64 km away
  48. 3.054 km SW of Atka, Alaska · 2230 days ago · 75 km deep · 48 km away
  49. 1.829 km ESE of Adak, Alaska · 2230 days ago · 65 km deep · 80 km away
  50. 1.957 km SSE of Adak, Alaska · 2229 days ago · 27 km deep · 86 km away
  51. 4.072 km NE of Adak, Alaska · 2229 days ago · 153 km deep · 98 km away
  52. 2.147 km NE of Adak, Alaska · 2229 days ago · 130 km deep · 96 km away
  53. 1.976 km ENE of Adak, Alaska · 2229 days ago · 162 km deep · 90 km away
  54. 2.119 km WSW of Atka, Alaska · 2228 days ago · 5 km deep · 84 km away
  55. 2.679 km SW of Atka, Alaska · 2228 days ago · 25 km deep · 23 km away
  56. 1.958 km ENE of Adak, Alaska · 2228 days ago · 123 km deep · 80 km away
  57. 2.040 km E of Adak, Alaska · 2228 days ago · 130 km deep · 76 km away
  58. 1.817 km W of Atka, Alaska · 2228 days ago · 99 km deep · 91 km away
  59. 1.6102 km ESE of Adak, Alaska · 2227 days ago · 30 km deep · 8 km away
  60. 1.5120 km SSW of Atka, Alaska · 2227 days ago · 9 km deep · 25 km away

The first 60 of 143.

Before

  1. 2.818 km ENE of Adak, Alaska · 2251 days ago · 106 km deep · 95 km away
  2. 1.758 km SSE of Adak, Alaska · 2251 days ago · 26 km deep · 77 km away
  3. 2.670 km SSE of Adak, Alaska · 2251 days ago · 27 km deep · 89 km away
  4. 1.540 km SSE of Adak, Alaska · 2252 days ago · 36 km deep · 83 km away
  5. 2.883 km SE of Adak, Alaska · 2252 days ago · 35 km deep · 37 km away
  6. 1.658 km ESE of Adak, Alaska · 2253 days ago · 23 km deep · 54 km away
  7. 2.067 km SSW of Atka, Alaska · 2253 days ago · 41 km deep · 36 km away
  8. 1.540 km ENE of Adak, Alaska · 2253 days ago · 6 km deep · 89 km away
  9. 2.549 km E of Adak, Alaska · 2253 days ago · 111 km deep · 72 km away
  10. 1.761 km SE of Adak, Alaska · 2253 days ago · 41 km deep · 63 km away
  11. 1.669 km SE of Adak, Alaska · 2254 days ago · 26 km deep · 53 km away
  12. 1.797 km ESE of Adak, Alaska · 2254 days ago · 27 km deep · 13 km away
  13. 3.648 km S of Atka, Alaska · 2255 days ago · 30 km deep · 67 km away
  14. 1.848 km E of Adak, Alaska · 2256 days ago · 120 km deep · 70 km away
  15. 2.667 km WSW of Atka, Alaska · 2257 days ago · 10 km deep · 42 km away
  16. 2.779 km SW of Atka, Alaska · 2257 days ago · 23 km deep · 24 km away
  17. 1.646 km SSE of Atka, Alaska · 2258 days ago · 42 km deep · 96 km away
  18. 1.778 km SSE of Adak, Alaska · 2258 days ago · 26 km deep · 78 km away
  19. 2.234 km W of Atka, Alaska · 2258 days ago · 204 km deep · 87 km away
  20. 1.617 km WSW of Atka, Alaska · 2259 days ago · 10 km deep · 85 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000bi8g (also filed as ak0209xijufu). Read Fri, Oct 2, 2026, 8:43 AM UTC.