Alaska earthquakes

M3.1 earthquake 209 km WSW of Adak, Alaska

A magnitude 3.1 earthquake struck 209 km WSW of Adak, Alaska on Mon, Sep 18, 2023, 9:41 AM HADT (18:41 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M4.1 Rat Islands, Aleutian Islands, Alaska. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.1 (ML, local (Richter)), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2023-09-18 18:41:23 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.332° N, 179.531° 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
3.1ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.081 · 20 stations
2.9ML, 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 2.6 km horizontally, 1.8 km in depth
Magnitude uncertainty
±0.08
Depth from
Operator assigned
Station coverage gap
200°, poorly surrounded by stations
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 172 in the 60 days after this one and 126 in the 30 days before it.

After

  1. 2.1Andreanof Islands, Aleutian Islands, Alaska · 1108 days ago · 21 km deep · 32 km away
  2. 1.7213 km W of Adak, Alaska · 1108 days ago · 13 km deep · 44 km away
  3. 2.9243 km W of Adak, Alaska · 1108 days ago · 90 km deep · 60 km away
  4. 2.6128 km WSW of Adak, Alaska · 1107 days ago · 35 km deep · 90 km away
  5. 2.1111 km WSW of Adak, Alaska · 1107 days ago · 13 km deep · 99 km away
  6. 3.2Rat Islands, Aleutian Islands, Alaska · 1107 days ago · 146 km deep · 69 km away
  7. 1.9214 km W of Adak, Alaska · 1107 days ago · 7 km deep · 44 km away
  8. 1.9Andreanof Islands, Aleutian Islands, Alaska · 1106 days ago · 11 km deep · 70 km away
  9. 3.8184 km WSW of Adak, Alaska · 1105 days ago · 61 km deep · 26 km away
  10. 1.8151 km WSW of Adak, Alaska · 1104 days ago · 26 km deep · 73 km away
  11. 2.0Andreanof Islands, Aleutian Islands, Alaska · 1104 days ago · 26 km deep · 74 km away
  12. 1.8230 km W of Adak, Alaska · 1104 days ago · 13 km deep · 55 km away
  13. 2.3Rat Islands, Aleutian Islands, Alaska · 1103 days ago · 31 km deep · 91 km away
  14. 2.0114 km W of Adak, Alaska · 1103 days ago · 68 km deep · 97 km away
  15. 1.5266 km W of Adak, Alaska · 1103 days ago · 13 km deep · 65 km away
  16. 1.8125 km WSW of Adak, Alaska · 1103 days ago · 54 km deep · 87 km away
  17. 3.9282 km W of Adak, Alaska · 1103 days ago · 71 km deep · 83 km away
  18. 2.7127 km WSW of Adak, Alaska · 1102 days ago · 10 km deep · 82 km away
  19. 2.6243 km W of Adak, Alaska · 1101 days ago · 144 km deep · 77 km away
  20. 1.8134 km W of Adak, Alaska · 1101 days ago · 13 km deep · 79 km away
  21. 2.6209 km W of Adak, Alaska · 1101 days ago · 171 km deep · 85 km away
  22. 1.8128 km WSW of Adak, Alaska · 1101 days ago · 15 km deep · 84 km away
  23. 1.5116 km WSW of Adak, Alaska · 1101 days ago · 51 km deep · 94 km away
  24. 1.8181 km WSW of Adak, Alaska · 1101 days ago · 56 km deep · 29 km away
  25. 1.9218 km W of Adak, Alaska · 1101 days ago · 76 km deep · 39 km away
  26. 2.1248 km WSW of Adak, Alaska · 1101 days ago · 13 km deep · 42 km away
  27. 2.2122 km W of Adak, Alaska · 1100 days ago · 14 km deep · 98 km away
  28. 2.3110 km WSW of Adak, Alaska · 1099 days ago · 7 km deep · 99 km away
  29. 2.6243 km WSW of Adak, Alaska · 1099 days ago · 63 km deep · 41 km away
  30. 2.7227 km W of Adak, Alaska · 1099 days ago · 174 km deep · 85 km away
  31. 1.8Andreanof Islands, Aleutian Islands, Alaska · 1098 days ago · 41 km deep · 9 km away
  32. 1.6112 km WSW of Adak, Alaska · 1098 days ago · 13 km deep · 97 km away
  33. 1.7123 km WSW of Adak, Alaska · 1098 days ago · 14 km deep · 87 km away
  34. 2.7134 km SW of Adak, Alaska · 1098 days ago · 35 km deep · 90 km away
  35. 2.9249 km WSW of Adak, Alaska · 1098 days ago · 65 km deep · 43 km away
  36. 2.7221 km WSW of Adak, Alaska · 1097 days ago · 56 km deep · 12 km away
  37. 2.2120 km WSW of Adak, Alaska · 1097 days ago · 15 km deep · 91 km away
  38. 2.1189 km WSW of Adak, Alaska · 1096 days ago · 23 km deep · 21 km away
  39. 1.9129 km WSW of Adak, Alaska · 1096 days ago · 26 km deep · 89 km away
  40. 2.0Andreanof Islands, Aleutian Islands, Alaska · 1095 days ago · 18 km deep · 12 km away
  41. 1.9Rat Islands, Aleutian Islands, Alaska · 1095 days ago · 24 km deep · 98 km away
  42. 2.1275 km W of Adak, Alaska · 1095 days ago · 67 km deep · 80 km away
  43. 2.1129 km SW of Adak, Alaska · 1095 days ago · 26 km deep · 100 km away
  44. 1.8243 km WSW of Adak, Alaska · 1094 days ago · 13 km deep · 44 km away
  45. 3.2190 km WSW of Adak, Alaska · 1093 days ago · 35 km deep · 19 km away
  46. 2.5136 km W of Adak, Alaska · 1092 days ago · 136 km deep · 79 km away
  47. 2.0143 km WSW of Adak, Alaska · 1092 days ago · 29 km deep · 72 km away
  48. 2.0241 km WSW of Adak, Alaska · 1092 days ago · 10 km deep · 40 km away
  49. 1.9139 km WSW of Adak, Alaska · 1092 days ago · 23 km deep · 79 km away
  50. 1.7247 km WSW of Adak, Alaska · 1092 days ago · 15 km deep · 38 km away
  51. 2.6127 km WSW of Adak, Alaska · 1091 days ago · 33 km deep · 87 km away
  52. 2.2150 km W of Adak, Alaska · 1091 days ago · 142 km deep · 78 km away
  53. 2.1198 km W of Adak, Alaska · 1091 days ago · 91 km deep · 62 km away
  54. 1.9271 km W of Adak, Alaska · 1091 days ago · 56 km deep · 71 km away
  55. 2.1187 km W of Adak, Alaska · 1090 days ago · 74 km deep · 41 km away
  56. 1.7114 km WSW of Adak, Alaska · 1090 days ago · 26 km deep · 99 km away
  57. 2.0238 km WSW of Adak, Alaska · 1089 days ago · 15 km deep · 39 km away
  58. 1.9277 km W of Adak, Alaska · 1088 days ago · 59 km deep · 79 km away
  59. 2.0138 km SW of Adak, Alaska · 1088 days ago · 21 km deep · 96 km away
  60. 2.7175 km WSW of Adak, Alaska · 1087 days ago · 30 km deep · 34 km away

The first 60 of 172.

Before

  1. 2.8233 km WSW of Adak, Alaska · 1109 days ago · 66 km deep · 31 km away
  2. 2.4163 km SW of Adak, Alaska · 1109 days ago · 13 km deep · 100 km away
  3. 2.8Andreanof Islands, Aleutian Islands, Alaska · 1110 days ago · 119 km deep · 71 km away
  4. 1.8115 km WSW of Adak, Alaska · 1110 days ago · 13 km deep · 98 km away
  5. 2.5Andreanof Islands, Aleutian Islands, Alaska · 1110 days ago · 14 km deep · 38 km away
  6. 2.0237 km WSW of Adak, Alaska · 1110 days ago · 14 km deep · 42 km away
  7. 2.7Rat Islands, Aleutian Islands, Alaska · 1110 days ago · 34 km deep · 94 km away
  8. 2.2190 km WSW of Adak, Alaska · 1111 days ago · 13 km deep · 29 km away
  9. 2.1194 km W of Adak, Alaska · 1111 days ago · 75 km deep · 33 km away
  10. 1.9257 km WSW of Adak, Alaska · 1112 days ago · 34 km deep · 48 km away
  11. 2.5157 km WSW of Adak, Alaska · 1112 days ago · 10 km deep · 61 km away
  12. 2.3236 km WSW of Adak, Alaska · 1112 days ago · 13 km deep · 40 km away
  13. 3.8209 km WSW of Adak, Alaska · 1112 days ago · 51 km deep · 10 km away
  14. 3.6283 km WSW of Adak, Alaska · 1113 days ago · 35 km deep · 79 km away
  15. 3.3125 km WSW of Adak, Alaska · 1113 days ago · 87 km deep · 85 km away
  16. 1.8129 km WSW of Adak, Alaska · 1113 days ago · 25 km deep · 81 km away
  17. 2.0Andreanof Islands, Aleutian Islands, Alaska · 1114 days ago · 13 km deep · 41 km away
  18. 2.0236 km WSW of Adak, Alaska · 1114 days ago · 14 km deep · 38 km away
  19. 2.0237 km WSW of Adak, Alaska · 1114 days ago · 12 km deep · 41 km away
  20. 2.0235 km WSW of Adak, Alaska · 1114 days ago · 13 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000lcd2 (also filed as ak023bzy87zw). Read Thu, Oct 1, 2026, 8:02 AM UTC.