Alaska earthquakes

M2.8 earthquake 85 km SW of Adak, Alaska

A magnitude 2.8 earthquake struck 85 km SW of Adak, Alaska on Fri, Nov 20, 2020, 5:21 PM HAST (03:21 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.0 124 km SW 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
2.8 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-11-21 03:21:09 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.380° N, 177.590° 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 · ±0.115 · 10 stations
2.3ML, 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 4.8 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
216°, poorly surrounded by stations
Stations used
28

Nearby

Within 100 km, magnitude 1.5 and up: 141 in the 60 days after this one and 72 in the 30 days before it.

After

  1. 1.8102 km WSW of Adak, Alaska · 2142 days ago · 52 km deep · 25 km away
  2. 1.7Andreanof Islands, Aleutian Islands, Alaska · 2141 days ago · 10 km deep · 39 km away
  3. 2.129 km WSW of Adak, Alaska · 2140 days ago · 74 km deep · 58 km away
  4. 1.851 km SW of Adak, Alaska · 2140 days ago · 32 km deep · 37 km away
  5. 1.878 km W of Adak, Alaska · 2139 days ago · -2 km deep · 55 km away
  6. 2.078 km W of Adak, Alaska · 2139 days ago · 5 km deep · 54 km away
  7. 1.878 km W of Adak, Alaska · 2139 days ago · 4 km deep · 55 km away
  8. 1.581 km W of Adak, Alaska · 2138 days ago · 6 km deep · 56 km away
  9. 2.8157 km WSW of Adak, Alaska · 2137 days ago · 33 km deep · 73 km away
  10. 4.045 km SSE of Adak, Alaska · 2136 days ago · 43 km deep · 80 km away
  11. 1.868 km SSW of Adak, Alaska · 2136 days ago · 26 km deep · 37 km away
  12. 1.676 km WSW of Adak, Alaska · 2136 days ago · 37 km deep · 15 km away
  13. 2.941 km SW of Adak, Alaska · 2136 days ago · 60 km deep · 46 km away
  14. 3.632 km SE of Adak, Alaska · 2134 days ago · 59 km deep · 91 km away
  15. 3.314 km SSE of Adak, Alaska · 2134 days ago · 67 km deep · 83 km away
  16. 2.7104 km SW of Adak, Alaska · 2133 days ago · 35 km deep · 19 km away
  17. 1.817 km SSE of Adak, Alaska · 2133 days ago · 61 km deep · 83 km away
  18. 3.014 km SSE of Adak, Alaska · 2133 days ago · 66 km deep · 82 km away
  19. 4.9182 km WSW of Adak, Alaska · 2133 days ago · 37 km deep · 100 km away
  20. 2.559 km SSW of Adak, Alaska · 2133 days ago · 38 km deep · 35 km away
  21. 1.9133 km WSW of Adak, Alaska · 2132 days ago · 13 km deep · 64 km away
  22. 2.345 km W of Adak, Alaska · 2131 days ago · 107 km deep · 62 km away
  23. 1.657 km SSE of Adak, Alaska · 2131 days ago · 24 km deep · 98 km away
  24. 1.754 km SSE of Adak, Alaska · 2131 days ago · 26 km deep · 88 km away
  25. 1.851 km SSE of Adak, Alaska · 2131 days ago · 26 km deep · 88 km away
  26. 1.549 km WSW of Adak, Alaska · 2131 days ago · 70 km deep · 39 km away
  27. 3.369 km SW of Adak, AK · 2131 days ago · 64 km deep · 19 km away
  28. 1.661 km SSE of Adak, Alaska · 2130 days ago · 26 km deep · 96 km away
  29. 2.0108 km SW of Adak, Alaska · 2129 days ago · 28 km deep · 25 km away
  30. 2.654 km SW of Adak, Alaska · 2129 days ago · 47 km deep · 37 km away
  31. 3.254 km SSE of Adak, Alaska · 2129 days ago · 36 km deep · 83 km away
  32. 2.0166 km WSW of Adak, Alaska · 2129 days ago · 26 km deep · 91 km away
  33. 1.649 km SSE of Adak, Alaska · 2129 days ago · 24 km deep · 83 km away
  34. 1.864 km SW of Adak, Alaska · 2128 days ago · 35 km deep · 23 km away
  35. 2.835 km SSE of Adak, Alaska · 2128 days ago · 57 km deep · 82 km away
  36. 3.448 km SSW of Adak, Alaska · 2128 days ago · 35 km deep · 57 km away
  37. 2.554 km SSE of Adak, Alaska · 2128 days ago · 35 km deep · 78 km away
  38. 2.0118 km WSW of Adak, Alaska · 2128 days ago · 16 km deep · 42 km away
  39. 1.652 km SSE of Adak, Alaska · 2127 days ago · 29 km deep · 94 km away
  40. 2.730 km SSW of Adak, Alaska · 2127 days ago · 214 km deep · 61 km away
  41. 2.846 km SSE of Adak, Alaska · 2126 days ago · 32 km deep · 91 km away
  42. 1.541 km SSE of Adak, Alaska · 2125 days ago · 32 km deep · 86 km away
  43. 2.0121 km WSW of Adak, Alaska · 2125 days ago · 23 km deep · 50 km away
  44. 1.7107 km SW of Adak, Alaska · 2124 days ago · 40 km deep · 22 km away
  45. 1.782 km SSE of Adak, Alaska · 2124 days ago · 25 km deep · 100 km away
  46. 2.013 km SE of Adak, Alaska · 2123 days ago · 87 km deep · 90 km away
  47. 3.9159 km SSW of Adak, Alaska · 2123 days ago · 10 km deep · 89 km away
  48. 2.149 km SSE of Adak, Alaska · 2123 days ago · 26 km deep · 87 km away
  49. 2.774 km SW of Adak, Alaska · 2123 days ago · 53 km deep · 13 km away
  50. 1.8102 km WSW of Adak, Alaska · 2122 days ago · 22 km deep · 26 km away
  51. 3.948 km S of Adak, Alaska · 2122 days ago · 35 km deep · 72 km away
  52. 1.5Andreanof Islands, Aleutian Islands, Alaska · 2121 days ago · 7 km deep · 48 km away
  53. 1.742 km SW of Adak, Alaska · 2121 days ago · 51 km deep · 44 km away
  54. 1.755 km S of Adak, Alaska · 2121 days ago · 23 km deep · 68 km away
  55. 3.076 km SSW of Adak, Alaska · 2121 days ago · 35 km deep · 31 km away
  56. 1.9155 km WSW of Adak, Alaska · 2121 days ago · 22 km deep · 71 km away
  57. 2.737 km SSE of Adak, Alaska · 2120 days ago · 48 km deep · 84 km away
  58. 1.6136 km W of Adak, Alaska · 2119 days ago · 8 km deep · 75 km away
  59. 1.993 km WSW of Adak, Alaska · 2119 days ago · 43 km deep · 21 km away
  60. 1.680 km W of Adak, Alaska · 2119 days ago · 2 km deep · 56 km away

The first 60 of 141.

Before

  1. 1.869 km WSW of Adak, Alaska · 2142 days ago · 56 km deep · 21 km away
  2. 1.745 km SSW of Adak, Alaska · 2142 days ago · 61 km deep · 58 km away
  3. 2.1122 km WSW of Adak, Alaska · 2142 days ago · 17 km deep · 42 km away
  4. 1.754 km SSW of Adak, Alaska · 2142 days ago · 28 km deep · 48 km away
  5. 1.9139 km SW of Adak, Alaska · 2144 days ago · 27 km deep · 54 km away
  6. 2.0130 km WSW of Adak, Alaska · 2144 days ago · 25 km deep · 52 km away
  7. 3.6161 km SW of Adak, Alaska · 2144 days ago · 35 km deep · 77 km away
  8. 2.0135 km WSW of Adak, Alaska · 2145 days ago · 26 km deep · 59 km away
  9. 3.1104 km S of Adak, Alaska · 2146 days ago · 24 km deep · 99 km away
  10. 2.690 km WSW of Adak, Alaska · 2147 days ago · 74 km deep · 32 km away
  11. 1.7103 km WSW of Adak, Alaska · 2147 days ago · 32 km deep · 35 km away
  12. 1.657 km SSE of Adak, Alaska · 2147 days ago · 26 km deep · 94 km away
  13. 1.9158 km W of Adak, Alaska · 2148 days ago · 7 km deep · 99 km away
  14. 1.960 km S of Adak, Alaska · 2148 days ago · 43 km deep · 76 km away
  15. 2.581 km W of Adak, Alaska · 2148 days ago · 4 km deep · 53 km away
  16. 3.1128 km SW of Adak, Alaska · 2148 days ago · 29 km deep · 43 km away
  17. 1.9131 km WSW of Adak, Alaska · 2149 days ago · 10 km deep · 65 km away
  18. 2.9136 km WSW of Adak, Alaska · 2149 days ago · 33 km deep · 52 km away
  19. 1.741 km S of Adak, Alaska · 2149 days ago · 34 km deep · 71 km away
  20. 1.9154 km WSW of Adak, Alaska · 2149 days ago · 60 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000cq1s (also filed as ak020ez73yla). Read Fri, Oct 2, 2026, 5:28 PM UTC.