Alaska earthquakes

M2.5 earthquake 57 km N of Adak, Alaska

A magnitude 2.5 earthquake struck 57 km N of Adak, Alaska on Mon, Jul 31, 2023, 9:39 AM HADT (18:39 UTC), 195 km (121 mi) below the surface.

A larger quake followed: M5.0 44 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
2.5 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2023-07-31 18:39:01 UTC
Depth
195.0 km (121.2 mi), intermediate-depth
Epicenter
52.390° N, 176.530° 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
2.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.097 · 14 stations
2.4ML, 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 12.5 km horizontally, 10.5 km in depth
Magnitude uncertainty
±0.10
Depth from
From location
Station coverage gap
189°, poorly surrounded by stations
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 65 in the 60 days after this one and 41 in the 30 days before it.

After

  1. 2.236 km NE of Adak, Alaska · 1158 days ago · 119 km deep · 35 km away
  2. 2.244 km NNW of Adak, Alaska · 1156 days ago · 137 km deep · 28 km away
  3. 3.275 km W of Atka, Alaska · 1156 days ago · 123 km deep · 89 km away
  4. 1.738 km SSE of Adak, Alaska · 1154 days ago · 34 km deep · 93 km away
  5. 1.634 km SSE of Adak, Alaska · 1153 days ago · 41 km deep · 89 km away
  6. 1.661 km ESE of Adak, Alaska · 1152 days ago · 35 km deep · 100 km away
  7. 1.877 km W of Atka, Alaska · 1152 days ago · 82 km deep · 86 km away
  8. 1.652 km WSW of Adak, Alaska · 1152 days ago · 67 km deep · 96 km away
  9. 2.454 km E of Adak, Alaska · 1152 days ago · 75 km deep · 79 km away
  10. 1.5Andreanof Islands, Aleutian Islands, Alaska · 1150 days ago · 33 km deep · 93 km away
  11. 1.738 km E of Adak, Alaska · 1149 days ago · 82 km deep · 69 km away
  12. 2.812 km S of Adak, Alaska · 1149 days ago · 13 km deep · 70 km away
  13. 1.7Andreanof Islands, Aleutian Islands, Alaska · 1148 days ago · 72 km deep · 65 km away
  14. 2.768 km ENE of Adak, Alaska · 1147 days ago · 216 km deep · 70 km away
  15. 1.981 km WSW of Atka, Alaska · 1147 days ago · 70 km deep · 95 km away
  16. 1.614 km E of Adak, Alaska · 1146 days ago · 113 km deep · 57 km away
  17. 2.867 km NE of Adak, Alaska · 1145 days ago · 199 km deep · 38 km away
  18. 1.562 km ESE of Adak, Alaska · 1141 days ago · 59 km deep · 92 km away
  19. 2.458 km E of Adak, Alaska · 1140 days ago · 196 km deep · 79 km away
  20. 4.186 km NE of Adak, Alaska · 1140 days ago · 172 km deep · 48 km away
  21. 1.654 km WSW of Adak, Alaska · 1140 days ago · 72 km deep · 93 km away
  22. 3.4Andreanof Islands, Aleutian Islands, Alaska · 1139 days ago · 38 km deep · 98 km away
  23. 2.076 km W of Atka, Alaska · 1138 days ago · 98 km deep · 86 km away
  24. 1.682 km WSW of Atka, Alaska · 1136 days ago · 67 km deep · 95 km away
  25. 1.625 km S of Adak, Alaska · 1136 days ago · 68 km deep · 83 km away
  26. 1.626 km NNE of Adak, Alaska · 1136 days ago · 101 km deep · 33 km away
  27. 1.769 km W of Adak, Alaska · 1135 days ago · 95 km deep · 90 km away
  28. 2.037 km ESE of Adak, Alaska · 1134 days ago · 62 km deep · 77 km away
  29. 1.640 km S of Adak, Alaska · 1133 days ago · 33 km deep · 98 km away
  30. 1.858 km ENE of Adak, Alaska · 1133 days ago · 93 km deep · 67 km away
  31. 1.841 km W of Adak, Alaska · 1133 days ago · 71 km deep · 79 km away
  32. 1.848 km SE of Adak, Alaska · 1133 days ago · 24 km deep · 98 km away
  33. 1.638 km SSE of Adak, Alaska · 1132 days ago · 34 km deep · 92 km away
  34. 1.842 km SSE of Adak, Alaska · 1132 days ago · 46 km deep · 95 km away
  35. 2.718 km S of Adak, Alaska · 1131 days ago · 82 km deep · 76 km away
  36. 2.054 km WSW of Adak, Alaska · 1128 days ago · 76 km deep · 93 km away
  37. 1.532 km SSW of Adak, Alaska · 1127 days ago · 41 km deep · 90 km away
  38. 2.144 km E of Adak, Alaska · 1126 days ago · 70 km deep · 71 km away
  39. 1.738 km SE of Adak, Alaska · 1123 days ago · 87 km deep · 89 km away
  40. 1.542 km S of Adak, Alaska · 1122 days ago · 35 km deep · 99 km away
  41. 2.053 km NE of Adak, Alaska · 1122 days ago · 132 km deep · 39 km away
  42. 1.524 km SSW of Adak, Alaska · 1121 days ago · 65 km deep · 81 km away
  43. 1.719 km WSW of Adak, Alaska · 1121 days ago · 77 km deep · 68 km away
  44. 2.082 km W of Atka, Alaska · 1121 days ago · 107 km deep · 83 km away
  45. 1.621 km S of Adak, Alaska · 1120 days ago · 65 km deep · 80 km away
  46. 2.622 km ESE of Adak, Alaska · 1120 days ago · 68 km deep · 70 km away
  47. 1.828 km SSE of Adak, Alaska · 1120 days ago · 46 km deep · 83 km away
  48. 1.941 km S of Adak, Alaska · 1119 days ago · 44 km deep · 99 km away
  49. 3.543 km E of Adak, Alaska · 1119 days ago · 80 km deep · 72 km away
  50. 1.938 km ESE of Adak, Alaska · 1119 days ago · 72 km deep · 78 km away
  51. 1.829 km SW of Adak, Alaska · 1116 days ago · 2 km deep · 81 km away
  52. 2.215 km ESE of Adak, Alaska · 1116 days ago · 101 km deep · 64 km away
  53. 5.044 km SSE of Adak, Alaska · 1116 days ago · 50 km deep · 100 km away · felt by 2
  54. 2.650 km WSW of Adak, Alaska · 1115 days ago · 78 km deep · 89 km away
  55. 1.733 km SE of Adak, Alaska · 1113 days ago · 64 km deep · 83 km away
  56. 3.3101 km NNE of Adak, Alaska · 1113 days ago · 200 km deep · 53 km away
  57. 1.830 km WSW of Adak, Alaska · 1113 days ago · 13 km deep · 78 km away
  58. 1.836 km W of Adak, Alaska · 1111 days ago · 79 km deep · 77 km away
  59. 2.226 km E of Adak, Alaska · 1109 days ago · 67 km deep · 63 km away
  60. 1.632 km SSE of Adak, Alaska · 1106 days ago · 44 km deep · 86 km away

The first 60 of 65.

Before

  1. 2.374 km ENE of Adak, Alaska · 1160 days ago · 147 km deep · 60 km away
  2. 1.558 km WSW of Adak, Alaska · 1160 days ago · 68 km deep · 96 km away
  3. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1160 days ago · 116 km deep · 43 km away
  4. 1.721 km S of Adak, Alaska · 1161 days ago · 60 km deep · 78 km away
  5. 1.540 km SW of Adak, Alaska · 1161 days ago · 59 km deep · 95 km away
  6. 2.769 km NE of Adak, Alaska · 1162 days ago · 211 km deep · 49 km away
  7. 2.055 km ENE of Adak, Alaska · 1163 days ago · 172 km deep · 54 km away
  8. 1.5Andreanof Islands, Aleutian Islands, Alaska · 1163 days ago · 53 km deep · 97 km away
  9. 2.3Andreanof Islands, Aleutian Islands, Alaska · 1163 days ago · 207 km deep · 63 km away
  10. 1.639 km SSE of Adak, Alaska · 1163 days ago · 36 km deep · 94 km away
  11. 1.710 km NW of Adak, Alaska · 1163 days ago · 118 km deep · 53 km away
  12. 1.759 km W of Adak, Alaska · 1164 days ago · 92 km deep · 87 km away
  13. 2.232 km ESE of Adak, Alaska · 1164 days ago · 62 km deep · 72 km away
  14. 1.838 km SSE of Adak, Alaska · 1165 days ago · 36 km deep · 93 km away
  15. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1165 days ago · 86 km deep · 50 km away
  16. 1.940 km S of Adak, Alaska · 1166 days ago · 35 km deep · 98 km away
  17. 2.956 km NE of Adak, Alaska · 1166 days ago · 188 km deep · 43 km away
  18. 1.640 km SSE of Adak, Alaska · 1168 days ago · 30 km deep · 94 km away
  19. 3.165 km ENE of Adak, Alaska · 1169 days ago · 157 km deep · 56 km away
  20. 2.6Andreanof Islands, Aleutian Islands, Alaska · 1169 days ago · 35 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000kz9m (also filed as ak0239qwvql2). Read Fri, Oct 2, 2026, 6:57 PM UTC.