Alaska earthquakes

M3.6 earthquake 52 km SE of Adak, Alaska

A magnitude 3.6 earthquake struck 52 km SE of Adak, Alaska on Thu, Apr 20, 2023, 7:30 AM HADT (16:30 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M4.6 15 km SE 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
3.6 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2023-04-20 16:30:19 UTC
Depth
40.4 km (25.1 mi), shallow
Epicenter
51.482° N, 176.209° 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
3.6ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.081 · 20 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 5.9 km horizontally, 21.1 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
205°, poorly surrounded by stations
Stations used
36

Nearby

Within 100 km, magnitude 1.5 and up: at least 199 in the 60 days after this one and 91 in the 30 days before it.

After

  1. 1.971 km SSE of Adak, Alaska · 1263 days ago · 14 km deep · 28 km away
  2. 1.865 km SSE of Adak, Alaska · 1262 days ago · 23 km deep · 26 km away
  3. 2.8101 km ESE of Adak, Alaska · 1262 days ago · 35 km deep · 66 km away
  4. 1.870 km SSW of Adak, Alaska · 1262 days ago · 19 km deep · 60 km away
  5. 2.333 km NNW of Adak, Alaska · 1262 days ago · 170 km deep · 85 km away
  6. 3.577 km WSW of Atka, Alaska · 1262 days ago · 74 km deep · 82 km away
  7. 2.511 km SE of Adak, Alaska · 1262 days ago · 74 km deep · 42 km away
  8. 3.277 km SW of Adak, Alaska · 1260 days ago · 54 km deep · 89 km away
  9. 2.779 km WSW of Adak, Alaska · 1260 days ago · 68 km deep · 98 km away
  10. 2.764 km SW of Atka, Alaska · 1260 days ago · 70 km deep · 97 km away
  11. 2.654 km WSW of Adak, Alaska · 1260 days ago · 74 km deep · 81 km away
  12. 3.3Andreanof Islands, Aleutian Islands, Alaska · 1258 days ago · 35 km deep · 22 km away
  13. 3.950 km SSW of Adak, Alaska · 1258 days ago · 51 km deep · 55 km away
  14. 2.180 km SE of Adak, Alaska · 1258 days ago · 31 km deep · 32 km away
  15. 3.060 km SE of Adak, Alaska · 1258 days ago · 35 km deep · 14 km away
  16. 2.569 km SSE of Adak, Alaska · 1258 days ago · 28 km deep · 21 km away
  17. 2.547 km SSE of Adak, Alaska · 1257 days ago · 35 km deep · 9 km away
  18. 1.888 km SW of Adak, Alaska · 1256 days ago · 34 km deep · 99 km away
  19. 2.0Andreanof Islands, Aleutian Islands, Alaska · 1256 days ago · 41 km deep · 75 km away
  20. 3.1Andreanof Islands, Aleutian Islands, Alaska · 1256 days ago · 72 km deep · 52 km away
  21. 1.978 km SW of Atka, Alaska · 1256 days ago · 36 km deep · 81 km away
  22. 1.553 km SSE of Adak, Alaska · 1256 days ago · 18 km deep · 7 km away
  23. 1.858 km SE of Adak, Alaska · 1256 days ago · 24 km deep · 7 km away
  24. 2.043 km E of Adak, Alaska · 1256 days ago · 132 km deep · 49 km away
  25. 1.969 km WSW of Atka, Alaska · 1256 days ago · 78 km deep · 90 km away
  26. 1.670 km E of Adak, Alaska · 1256 days ago · 18 km deep · 53 km away
  27. 2.152 km SSW of Adak, Alaska · 1255 days ago · 38 km deep · 58 km away
  28. 1.764 km SE of Adak, Alaska · 1255 days ago · 25 km deep · 20 km away
  29. 2.973 km SW of Adak, Alaska · 1255 days ago · 73 km deep · 90 km away
  30. 2.769 km SSW of Adak, Alaska · 1253 days ago · 35 km deep · 60 km away
  31. 3.542 km SW of Adak, Alaska · 1253 days ago · 31 km deep · 54 km away
  32. 2.072 km ENE of Adak, Alaska · 1250 days ago · 85 km deep · 81 km away
  33. 1.768 km SSE of Adak, Alaska · 1250 days ago · 21 km deep · 25 km away
  34. 3.858 km SW of Adak, Alaska · 1250 days ago · 34 km deep · 67 km away
  35. 2.141 km ENE of Adak, Alaska · 1249 days ago · 143 km deep · 61 km away
  36. 2.570 km ESE of Adak, Alaska · 1249 days ago · 81 km deep · 49 km away
  37. 1.7Andreanof Islands, Aleutian Islands, Alaska · 1249 days ago · 92 km deep · 71 km away
  38. 2.832 km ESE of Adak, Alaska · 1249 days ago · 69 km deep · 28 km away
  39. 3.384 km ESE of Adak, Alaska · 1249 days ago · 35 km deep · 47 km away
  40. 1.638 km WSW of Adak, Alaska · 1249 days ago · 15 km deep · 68 km away
  41. 1.535 km WSW of Adak, Alaska · 1249 days ago · 20 km deep · 70 km away
  42. 2.996 km SSE of Adak, Alaska · 1248 days ago · 10 km deep · 46 km away
  43. 2.786 km SW of Adak, Alaska · 1247 days ago · 35 km deep · 98 km away
  44. 2.749 km SSE of Adak, Alaska · 1247 days ago · 48 km deep · 9 km away
  45. 2.661 km SSW of Adak, Alaska · 1247 days ago · 35 km deep · 49 km away
  46. 2.191 km SW of Atka, Alaska · 1247 days ago · 26 km deep · 72 km away
  47. 4.587 km ESE of Adak, Alaska · 1246 days ago · 43 km deep · 49 km away
  48. 3.075 km ENE of Adak, Alaska · 1245 days ago · 156 km deep · 83 km away
  49. 1.878 km WSW of Adak, Alaska · 1245 days ago · 29 km deep · 98 km away
  50. 1.860 km WSW of Adak, Alaska · 1245 days ago · 20 km deep · 83 km away
  51. 1.851 km SW of Adak, Alaska · 1244 days ago · 39 km deep · 60 km away
  52. 3.622 km SSE of Adak, Alaska · 1244 days ago · 72 km deep · 31 km away
  53. 1.848 km SW of Adak, Alaska · 1244 days ago · 48 km deep · 62 km away
  54. 1.964 km WSW of Adak, Alaska · 1243 days ago · 86 km deep · 93 km away
  55. 1.874 km SSW of Adak, Alaska · 1242 days ago · 26 km deep · 59 km away
  56. 1.526 km WSW of Adak, Alaska · 1242 days ago · 15 km deep · 63 km away
  57. 1.889 km SW of Adak, Alaska · 1240 days ago · 33 km deep · 99 km away
  58. 1.662 km SE of Adak, Alaska · 1240 days ago · 13 km deep · 10 km away
  59. 1.865 km WSW of Adak, Alaska · 1240 days ago · 84 km deep · 89 km away
  60. 2.960 km NE of Adak, Alaska · 1240 days ago · 204 km deep · 85 km away

The first 60 of at least 199.

Before

  1. 3.2Andreanof Islands, Aleutian Islands, Alaska · 1264 days ago · 35 km deep · 98 km away
  2. 2.236 km W of Adak, Alaska · 1264 days ago · 88 km deep · 76 km away
  3. 3.774 km E of Adak, Alaska · 1264 days ago · 71 km deep · 58 km away
  4. 2.659 km S of Adak, Alaska · 1265 days ago · 35 km deep · 39 km away
  5. 3.0119 km SSW of Atka, Alaska · 1266 days ago · 31 km deep · 90 km away
  6. 3.8Andreanof Islands, Aleutian Islands, Alaska · 1267 days ago · 35 km deep · 68 km away
  7. 3.059 km SSW of Adak, Alaska · 1267 days ago · 35 km deep · 50 km away
  8. 3.451 km SSW of Adak, Alaska · 1267 days ago · 35 km deep · 54 km away
  9. 3.043 km NNE of Adak, Alaska · 1268 days ago · 206 km deep · 83 km away
  10. 2.7Andreanof Islands, Aleutian Islands, Alaska · 1268 days ago · 35 km deep · 11 km away
  11. 1.678 km SW of Adak, Alaska · 1268 days ago · 23 km deep · 90 km away
  12. 1.840 km ESE of Adak, Alaska · 1268 days ago · 29 km deep · 28 km away
  13. 1.752 km S of Adak, Alaska · 1268 days ago · 18 km deep · 24 km away
  14. 1.663 km ESE of Adak, Alaska · 1269 days ago · 28 km deep · 32 km away
  15. 2.5Andreanof Islands, Aleutian Islands, Alaska · 1269 days ago · 154 km deep · 85 km away
  16. 1.662 km SE of Adak, Alaska · 1269 days ago · 25 km deep · 18 km away
  17. 1.753 km SSE of Adak, Alaska · 1269 days ago · 26 km deep · 8 km away
  18. 2.679 km SW of Atka, Alaska · 1269 days ago · 60 km deep · 82 km away
  19. 1.733 km WSW of Adak, Alaska · 1270 days ago · 11 km deep · 72 km away
  20. 1.967 km SSW of Adak, Alaska · 1270 days ago · 26 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000jw33 (also filed as ak023526tkww). Read Mon, Oct 5, 2026, 7:19 AM UTC.