Alaska earthquakes

M3.4 earthquake 48 km SSW of Adak, Alaska

A magnitude 3.4 earthquake struck 48 km SSW of Adak, Alaska on Fri, Dec 4, 2020, 8:42 AM HAST (18:42 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
3.4 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-12-04 18:42:04 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.446° N, 176.776° 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 · ±0.115 · 10 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 3.4 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.12
Depth from
Operator assigned
Station coverage gap
212°, poorly surrounded by stations
Stations used
34

Nearby

Within 100 km, magnitude 1.5 and up: 156 in the 60 days after this one and 74 in the 30 days before it.

After

  1. 2.554 km SSE of Adak, Alaska · 2127 days ago · 35 km deep · 22 km away
  2. 2.0118 km WSW of Adak, Alaska · 2127 days ago · 16 km deep · 98 km away
  3. 1.652 km SSE of Adak, Alaska · 2127 days ago · 29 km deep · 37 km away
  4. 2.730 km SSW of Adak, Alaska · 2127 days ago · 214 km deep · 19 km away
  5. 1.635 km NE of Adak, Alaska · 2126 days ago · 8 km deep · 78 km away
  6. 3.361 km ENE of Adak, Alaska · 2126 days ago · 165 km deep · 96 km away
  7. 2.846 km SSE of Adak, Alaska · 2125 days ago · 32 km deep · 34 km away
  8. 1.541 km SSE of Adak, Alaska · 2125 days ago · 32 km deep · 30 km away
  9. 1.774 km ESE of Adak, Alaska · 2124 days ago · 22 km deep · 81 km away
  10. 1.7107 km SW of Adak, Alaska · 2124 days ago · 40 km deep · 75 km away
  11. 1.782 km SSE of Adak, Alaska · 2123 days ago · 25 km deep · 50 km away
  12. 2.013 km SE of Adak, Alaska · 2123 days ago · 87 km deep · 45 km away
  13. 2.149 km SSE of Adak, Alaska · 2122 days ago · 26 km deep · 30 km away
  14. 2.774 km SW of Adak, Alaska · 2122 days ago · 53 km deep · 52 km away
  15. 1.8102 km WSW of Adak, Alaska · 2121 days ago · 22 km deep · 81 km away
  16. 3.948 km S of Adak, Alaska · 2121 days ago · 35 km deep · 15 km away
  17. 1.5Andreanof Islands, Aleutian Islands, Alaska · 2121 days ago · 7 km deep · 64 km away
  18. 2.164 km ESE of Adak, Alaska · 2120 days ago · 26 km deep · 67 km away
  19. 1.742 km SW of Adak, Alaska · 2120 days ago · 51 km deep · 26 km away
  20. 1.755 km S of Adak, Alaska · 2120 days ago · 23 km deep · 14 km away
  21. 3.076 km SSW of Adak, Alaska · 2120 days ago · 35 km deep · 34 km away
  22. 2.737 km SSE of Adak, Alaska · 2119 days ago · 48 km deep · 28 km away
  23. 1.993 km WSW of Adak, Alaska · 2118 days ago · 43 km deep · 74 km away
  24. 1.680 km W of Adak, Alaska · 2118 days ago · 2 km deep · 85 km away
  25. 1.821 km NE of Adak, Alaska · 2117 days ago · 97 km deep · 68 km away
  26. 1.584 km SW of Adak, Alaska · 2117 days ago · 26 km deep · 58 km away
  27. 1.566 km WSW of Adak, Alaska · 2117 days ago · 72 km deep · 63 km away
  28. 2.153 km E of Adak, Alaska · 2117 days ago · 153 km deep · 85 km away
  29. 1.857 km WSW of Adak, Alaska · 2117 days ago · 12 km deep · 59 km away
  30. 2.882 km W of Adak, Alaska · 2117 days ago · 10 km deep · 84 km away
  31. 1.8112 km WSW of Adak, Alaska · 2116 days ago · 13 km deep · 95 km away
  32. 2.067 km SE of Adak, Alaska · 2116 days ago · 23 km deep · 55 km away
  33. 2.593 km SSW of Adak, Alaska · 2116 days ago · 42 km deep · 51 km away
  34. 3.268 km SE of Adak, Alaska · 2115 days ago · 35 km deep · 59 km away
  35. 3.849 km SSW of Adak, Alaska · 2115 days ago · 42 km deep · 1 km away
  36. 5.0124 km SW of Adak, Alaska · 2115 days ago · 42 km deep · 97 km away · felt by 1
  37. 2.138 km ENE of Adak, Alaska · 2115 days ago · 140 km deep · 76 km away
  38. 1.717 km SE of Adak, Alaska · 2115 days ago · 71 km deep · 42 km away
  39. 1.640 km SW of Adak, Alaska · 2114 days ago · 48 km deep · 32 km away
  40. 2.666 km E of Adak, Alaska · 2113 days ago · 86 km deep · 95 km away
  41. 1.979 km SW of Adak, Alaska · 2113 days ago · 31 km deep · 56 km away
  42. 2.547 km SE of Adak, Alaska · 2113 days ago · 35 km deep · 38 km away
  43. 2.563 km ENE of Adak, Alaska · 2112 days ago · 217 km deep · 99 km away
  44. 1.9111 km SW of Adak, Alaska · 2112 days ago · 26 km deep · 78 km away
  45. 1.8104 km SW of Adak, Alaska · 2112 days ago · 44 km deep · 73 km away
  46. 1.8109 km SW of Adak, Alaska · 2112 days ago · 48 km deep · 77 km away
  47. 1.782 km W of Adak, Alaska · 2111 days ago · 7 km deep · 87 km away
  48. 1.667 km WSW of Adak, Alaska · 2111 days ago · 40 km deep · 48 km away
  49. 2.184 km W of Adak, Alaska · 2110 days ago · 94 km deep · 84 km away
  50. 3.074 km SSE of Adak, Alaska · 2109 days ago · 25 km deep · 51 km away
  51. 2.0101 km WSW of Adak, Alaska · 2108 days ago · 64 km deep · 88 km away
  52. 1.896 km SW of Adak, Alaska · 2107 days ago · 45 km deep · 66 km away
  53. 1.969 km SSW of Adak, Alaska · 2107 days ago · 44 km deep · 27 km away
  54. 1.961 km SSW of Adak, Alaska · 2107 days ago · 43 km deep · 21 km away
  55. 1.8115 km WSW of Adak, Alaska · 2106 days ago · 29 km deep · 94 km away
  56. 2.090 km W of Adak, Alaska · 2105 days ago · 11 km deep · 93 km away
  57. 1.688 km W of Adak, Alaska · 2105 days ago · 7 km deep · 91 km away
  58. 1.975 km SW of Adak, Alaska · 2105 days ago · 33 km deep · 45 km away
  59. 2.088 km W of Adak, Alaska · 2105 days ago · 7 km deep · 91 km away
  60. 1.547 km SSE of Adak, Alaska · 2105 days ago · 18 km deep · 33 km away

The first 60 of 156.

Before

  1. 2.835 km SSE of Adak, Alaska · 2128 days ago · 57 km deep · 27 km away
  2. 1.864 km SW of Adak, Alaska · 2128 days ago · 35 km deep · 36 km away
  3. 1.649 km SSE of Adak, Alaska · 2128 days ago · 24 km deep · 26 km away
  4. 3.254 km SSE of Adak, Alaska · 2128 days ago · 36 km deep · 27 km away
  5. 2.654 km SW of Adak, Alaska · 2128 days ago · 47 km deep · 21 km away
  6. 2.0108 km SW of Adak, Alaska · 2128 days ago · 28 km deep · 72 km away
  7. 1.661 km SSE of Adak, Alaska · 2129 days ago · 26 km deep · 40 km away
  8. 3.369 km SW of Adak, AK · 2130 days ago · 64 km deep · 48 km away
  9. 1.549 km WSW of Adak, Alaska · 2130 days ago · 70 km deep · 43 km away
  10. 1.559 km SE of Adak, Alaska · 2130 days ago · 26 km deep · 52 km away
  11. 1.560 km SE of Adak, Alaska · 2130 days ago · 17 km deep · 50 km away
  12. 1.851 km SSE of Adak, Alaska · 2131 days ago · 26 km deep · 31 km away
  13. 1.754 km SSE of Adak, Alaska · 2131 days ago · 26 km deep · 31 km away
  14. 1.657 km SSE of Adak, Alaska · 2131 days ago · 24 km deep · 41 km away
  15. 2.345 km W of Adak, Alaska · 2131 days ago · 107 km deep · 63 km away
  16. 2.559 km SSW of Adak, Alaska · 2132 days ago · 38 km deep · 22 km away
  17. 3.014 km SSE of Adak, Alaska · 2132 days ago · 66 km deep · 37 km away
  18. 1.817 km SSE of Adak, Alaska · 2132 days ago · 61 km deep · 36 km away
  19. 2.7104 km SW of Adak, Alaska · 2132 days ago · 35 km deep · 76 km away
  20. 3.314 km SSE of Adak, Alaska · 2133 days ago · 67 km deep · 37 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000crvk (also filed as ak020fky5go2). Read Thu, Oct 1, 2026, 9:19 PM UTC.