Alaska earthquakes

M3.0 earthquake 18 km S of Adak, Alaska

A magnitude 3.0 earthquake struck 18 km S of Adak, Alaska on Tue, Aug 11, 2020, 12:44 PM HADT (21:44 UTC), 69 km (43 mi) below the surface.

A larger quake followed: M4.3 68 km SSE of Adak, 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
3.0 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-08-11 21:44:27 UTC
Depth
69.1 km (42.9 mi), shallow
Epicenter
51.707° N, 176.619° 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
3.0ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.115 · 10 stations
2.5ML, 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 8.0 km horizontally, 8.5 km in depth
Magnitude uncertainty
±0.12
Depth from
From location
Station coverage gap
193°, poorly surrounded by stations
Stations used
44

Nearby

Within 100 km, magnitude 1.5 and up: 171 in the 60 days after this one and 104 in the 30 days before it.

After

  1. 2.484 km W of Atka, Alaska · 2244 days ago · 242 km deep · 95 km away
  2. 1.811 km S of Adak, Alaska · 2243 days ago · 84 km deep · 7 km away
  3. 3.161 km SE of Adak, Alaska · 2243 days ago · 35 km deep · 50 km away
  4. 1.618 km SE of Adak, Alaska · 2243 days ago · 67 km deep · 14 km away
  5. 1.796 km WSW of Adak, Alaska · 2243 days ago · 29 km deep · 90 km away
  6. 1.567 km SSE of Adak, Alaska · 2243 days ago · 19 km deep · 52 km away
  7. 1.525 km NNE of Adak, Alaska · 2242 days ago · 161 km deep · 42 km away
  8. 1.757 km SSE of Adak, Alaska · 2241 days ago · 22 km deep · 41 km away
  9. 2.067 km NE of Adak, Alaska · 2241 days ago · 176 km deep · 79 km away
  10. 1.588 km W of Adak, Alaska · 2240 days ago · 5 km deep · 91 km away
  11. 1.780 km W of Adak, Alaska · 2239 days ago · 8 km deep · 83 km away
  12. 2.842 km ENE of Adak, Alaska · 2239 days ago · 159 km deep · 52 km away
  13. 2.153 km SW of Adak, Alaska · 2239 days ago · 37 km deep · 40 km away
  14. 2.179 km NE of Adak, Alaska · 2238 days ago · 186 km deep · 92 km away
  15. 3.971 km NE of Adak, Alaska · 2238 days ago · 154 km deep · 84 km away
  16. 3.638 km SE of Adak, Alaska · 2238 days ago · 68 km deep · 30 km away
  17. 1.835 km ENE of Adak, Alaska · 2237 days ago · 128 km deep · 47 km away
  18. 2.055 km WNW of Adak, Alaska · 2236 days ago · 157 km deep · 64 km away
  19. 1.953 km ENE of Adak, Alaska · 2235 days ago · 218 km deep · 63 km away
  20. 1.867 km SE of Adak, Alaska · 2235 days ago · 25 km deep · 58 km away
  21. 2.063 km WSW of Adak, Alaska · 2234 days ago · 68 km deep · 58 km away
  22. 1.587 km SW of Atka, Alaska · 2234 days ago · 28 km deep · 100 km away
  23. 2.018 km ESE of Adak, Alaska · 2233 days ago · 80 km deep · 21 km away
  24. 3.459 km SSW of Adak, Alaska · 2232 days ago · 35 km deep · 41 km away
  25. 1.558 km SE of Adak, Alaska · 2232 days ago · 26 km deep · 44 km away
  26. 1.992 km W of Adak, Alaska · 2232 days ago · 2 km deep · 95 km away
  27. 2.770 km ENE of Adak, Alaska · 2232 days ago · 152 km deep · 79 km away
  28. 1.829 km ESE of Adak, Alaska · 2232 days ago · 65 km deep · 29 km away
  29. 1.957 km SSE of Adak, Alaska · 2231 days ago · 27 km deep · 40 km away
  30. 1.688 km W of Adak, Alaska · 2231 days ago · 6 km deep · 91 km away
  31. 1.588 km W of Adak, Alaska · 2231 days ago · 6 km deep · 90 km away
  32. 4.072 km NE of Adak, Alaska · 2231 days ago · 153 km deep · 85 km away
  33. 2.147 km NE of Adak, Alaska · 2231 days ago · 130 km deep · 60 km away
  34. 1.976 km ENE of Adak, Alaska · 2231 days ago · 162 km deep · 87 km away
  35. 1.958 km ENE of Adak, Alaska · 2230 days ago · 123 km deep · 67 km away
  36. 2.073 km WSW of Adak, Alaska · 2230 days ago · 58 km deep · 66 km away
  37. 2.370 km NNE of Adak, Alaska · 2230 days ago · 217 km deep · 87 km away
  38. 1.582 km W of Adak, Alaska · 2230 days ago · 5 km deep · 85 km away
  39. 2.040 km E of Adak, Alaska · 2230 days ago · 130 km deep · 45 km away
  40. 1.6102 km ESE of Adak, Alaska · 2229 days ago · 30 km deep · 95 km away
  41. 1.7104 km SW of Adak, Alaska · 2229 days ago · 64 km deep · 96 km away
  42. 1.828 km SSW of Adak, Alaska · 2229 days ago · 58 km deep · 13 km away
  43. 2.028 km NE of Adak, Alaska · 2229 days ago · 205 km deep · 43 km away
  44. 1.914 km WNW of Adak, Alaska · 2229 days ago · 188 km deep · 29 km away
  45. 1.651 km SW of Adak, Alaska · 2229 days ago · 31 km deep · 40 km away
  46. 1.876 km SW of Adak, Alaska · 2229 days ago · 39 km deep · 68 km away
  47. 1.582 km W of Adak, Alaska · 2228 days ago · 4 km deep · 85 km away
  48. 3.6Andreanof Islands, Aleutian Islands, Alaska · 2227 days ago · 35 km deep · 97 km away
  49. 1.685 km WSW of Atka, Alaska · 2227 days ago · 59 km deep · 90 km away
  50. 1.557 km WSW of Adak, Alaska · 2227 days ago · 57 km deep · 54 km away
  51. 2.618 km S of Adak, Alaska · 2227 days ago · 66 km deep · 2 km away
  52. 2.7102 km ESE of Adak, Alaska · 2226 days ago · 35 km deep · 95 km away
  53. 1.843 km SSW of Adak, Alaska · 2226 days ago · 62 km deep · 30 km away
  54. 1.596 km ESE of Adak, Alaska · 2226 days ago · 26 km deep · 89 km away
  55. 2.551 km SW of Adak, Alaska · 2226 days ago · 33 km deep · 40 km away
  56. 1.550 km ESE of Adak, Alaska · 2226 days ago · 50 km deep · 42 km away
  57. 1.677 km W of Adak, Alaska · 2225 days ago · 4 km deep · 80 km away
  58. 1.794 km ESE of Adak, Alaska · 2225 days ago · 33 km deep · 89 km away
  59. 1.539 km SSE of Adak, Alaska · 2224 days ago · 36 km deep · 22 km away
  60. 1.981 km W of Adak, Alaska · 2224 days ago · 10 km deep · 84 km away

The first 60 of 171.

Before

  1. 1.859 km SE of Adak, Alaska · 2245 days ago · 53 km deep · 45 km away
  2. 1.892 km SW of Adak, Alaska · 2245 days ago · 28 km deep · 80 km away
  3. 1.583 km W of Adak, Alaska · 2246 days ago · 5 km deep · 87 km away
  4. 1.979 km WSW of Adak, Alaska · 2246 days ago · 21 km deep · 73 km away
  5. 2.0115 km SSW of Adak, Alaska · 2246 days ago · 26 km deep · 98 km away
  6. 1.663 km WSW of Adak, Alaska · 2246 days ago · 26 km deep · 58 km away
  7. 1.575 km SW of Adak, Alaska · 2247 days ago · 25 km deep · 66 km away
  8. 3.656 km SSW of Adak, Alaska · 2247 days ago · 35 km deep · 43 km away
  9. 2.160 km SE of Adak, Alaska · 2248 days ago · 30 km deep · 49 km away
  10. 2.053 km S of Adak, Alaska · 2249 days ago · 26 km deep · 36 km away
  11. 1.873 km W of Adak, Alaska · 2249 days ago · 153 km deep · 73 km away
  12. 2.768 km WSW of Adak, Alaska · 2249 days ago · 10 km deep · 62 km away
  13. 3.081 km E of Adak, Alaska · 2249 days ago · 63 km deep · 80 km away
  14. 1.965 km ESE of Adak, Alaska · 2249 days ago · 28 km deep · 57 km away
  15. 1.539 km SSE of Adak, Alaska · 2249 days ago · 35 km deep · 23 km away
  16. 1.983 km ESE of Adak, Alaska · 2249 days ago · 23 km deep · 74 km away
  17. 2.0Andreanof Islands, Aleutian Islands, Alaska · 2249 days ago · 97 km deep · 41 km away
  18. 1.650 km SSW of Adak, Alaska · 2250 days ago · 34 km deep · 35 km away
  19. 1.688 km W of Adak, Alaska · 2250 days ago · 4 km deep · 91 km away
  20. 2.076 km SE of Adak, Alaska · 2250 days ago · 45 km deep · 66 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000bhjy (also filed as ak020aat5bz0). Read Sun, Oct 4, 2026, 9:23 AM UTC.