M1.8 earthquake 99 km W of Adak, Alaska

Magnitude

1.8 (ML, local (Richter)), micro

Magnitude from

AV

Local time

Sun, Apr 23, 2023, 6:30 AM HADT

UTC

2023-04-23 15:30:29 UTC

Depth

2.9 km (1.8 mi), shallow

Epicenter

51.860° N, 178.082° W

Region

Alaska

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.9 km horizontally, 1.6 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

201°, poorly surrounded by stations

Stations used

4

After

1. 1.798 km W of Adak, AlaskaSun, Apr 23, 6:42 AM HADT · 1257 days ago · -2 km deep · 1 km away
2. 1.699 km W of Adak, AlaskaSun, Apr 23, 7:20 AM HADT · 1257 days ago · -2 km deep · 1 km away
3. 3.277 km SW of Adak, AlaskaSun, Apr 23, 11:05 AM HADT · 1257 days ago · 54 km deep · 64 km away
4. 2.779 km WSW of Adak, AlaskaSun, Apr 23, 1:08 PM HADT · 1257 days ago · 68 km deep · 49 km away
5. 1.996 km W of Adak, AlaskaSun, Apr 23, 4:03 PM HADT · 1256 days ago · -2 km deep · 4 km away
6. 2.0141 km WSW of Adak, AlaskaMon, Apr 24, 1:09 AM HADT · 1256 days ago · 17 km deep · 71 km away
7. 2.654 km WSW of Adak, AlaskaMon, Apr 24, 5:46 AM HADT · 1256 days ago · 74 km deep · 56 km away
8. 1.599 km W of Adak, AlaskaMon, Apr 24, 6:13 AM HADT · 1256 days ago · 4 km deep · 1 km away
9. 2.395 km W of Adak, AlaskaMon, Apr 24, 8:19 AM HADT · 1256 days ago · 3 km deep · 5 km away
10. 1.599 km W of Adak, AlaskaMon, Apr 24, 10:32 AM HADT · 1256 days ago · 3 km deep · 2 km away
11. 1.6100 km W of Adak, AlaskaTue, Apr 25, 9:42 AM HADT · 1255 days ago · 5 km deep · 1 km away
12. 1.8Andreanof Islands, Aleutian Islands, AlaskaTue, Apr 25, 10:12 AM HADT · 1255 days ago · 26 km deep · 79 km away
13. 3.950 km SSW of Adak, AlaskaTue, Apr 25, 2:05 PM HADT · 1254 days ago · 51 km deep · 85 km away
14. 2.8112 km WSW of Adak, AlaskaTue, Apr 25, 2:53 PM HADT · 1254 days ago · 19 km deep · 42 km away
15. 2.1154 km WSW of Adak, AlaskaTue, Apr 25, 6:50 PM HADT · 1254 days ago · 31 km deep · 70 km away
16. 1.7100 km W of Adak, AlaskaTue, Apr 25, 8:08 PM HADT · 1254 days ago · 4 km deep · 1 km away
17. 2.499 km W of Adak, AlaskaTue, Apr 25, 8:10 PM HADT · 1254 days ago · 9 km deep · 3 km away
18. 2.4101 km W of Adak, AlaskaTue, Apr 25, 8:10 PM HADT · 1254 days ago · 4 km deep · 2 km away
19. 1.699 km W of Adak, AlaskaTue, Apr 25, 10:06 PM HADT · 1254 days ago · 3 km deep · 1 km away
20. 2.0100 km W of Adak, AlaskaTue, Apr 25, 11:13 PM HADT · 1254 days ago · 6 km deep · 2 km away
21. 1.5Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 27, 12:09 AM HADT · 1253 days ago · 3 km deep · 1 km away
22. 1.998 km W of Adak, AlaskaThu, Apr 27, 5:34 AM HADT · 1253 days ago · 4 km deep · 2 km away
23. 1.7Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 27, 6:20 AM HADT · 1253 days ago · 3 km deep · 1 km away
24. 1.888 km SW of Adak, AlaskaThu, Apr 27, 12:47 PM HADT · 1253 days ago · 34 km deep · 63 km away
25. 3.1Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 27, 6:09 PM HADT · 1252 days ago · 72 km deep · 87 km away
26. 1.698 km W of Adak, AlaskaFri, Apr 28, 12:13 AM HADT · 1252 days ago · 4 km deep · 1 km away
27. 2.152 km SSW of Adak, AlaskaFri, Apr 28, 12:54 PM HADT · 1252 days ago · 38 km deep · 83 km away
28. 1.699 km W of Adak, AlaskaFri, Apr 28, 4:55 PM HADT · 1251 days ago · 3 km deep · 1 km away
29. 1.7121 km WSW of Adak, AlaskaFri, Apr 28, 5:25 PM HADT · 1251 days ago · 26 km deep · 65 km away
30. 3.3132 km WSW of Adak, AlaskaFri, Apr 28, 10:16 PM HADT · 1251 days ago · 29 km deep · 56 km away
31. 2.973 km SW of Adak, AlaskaSat, Apr 29, 2:49 AM HADT · 1251 days ago · 73 km deep · 56 km away
32. 1.798 km W of Adak, AlaskaSat, Apr 29, 7:50 AM HADT · 1251 days ago · 3 km deep · 1 km away
33. 1.597 km W of Adak, AlaskaSat, Apr 29, 7:51 AM HADT · 1251 days ago · -2 km deep · 2 km away
34. 2.399 km W of Adak, AlaskaSat, Apr 29, 9:06 AM HADT · 1251 days ago · 4 km deep · 0 km away
35. 1.699 km W of Adak, AlaskaSat, Apr 29, 9:16 AM HADT · 1251 days ago · 4 km deep · 1 km away
36. 2.9123 km WSW of Adak, AlaskaSat, Apr 29, 4:26 PM HADT · 1250 days ago · 68 km deep · 45 km away
37. 3.091 km SW of Adak, AlaskaSat, Apr 29, 9:13 PM HADT · 1250 days ago · 35 km deep · 61 km away
38. 3.1Andreanof Islands, Aleutian Islands, AlaskaSun, Apr 30, 3:52 AM HADT · 1250 days ago · 31 km deep · 81 km away
39. 1.8100 km W of Adak, AlaskaSun, Apr 30, 8:22 AM HADT · 1250 days ago · 3 km deep · 1 km away
40. 2.769 km SSW of Adak, AlaskaSun, Apr 30, 11:46 PM HADT · 1249 days ago · 35 km deep · 96 km away
41. 3.542 km SW of Adak, AlaskaMon, May 1, 12:45 AM HADT · 1249 days ago · 31 km deep · 83 km away
42. 2.0104 km W of Adak, AlaskaMon, May 1, 6:06 AM HADT · 1249 days ago · 7 km deep · 5 km away
43. 2.9143 km WSW of Adak, AlaskaMon, May 1, 7:36 AM HADT · 1249 days ago · 31 km deep · 65 km away
44. 2.5Andreanof Islands, Aleutian Islands, AlaskaMon, May 1, 9:16 PM HADT · 1248 days ago · 33 km deep · 51 km away
45. 2.7157 km WSW of Adak, AlaskaTue, May 2, 2:32 PM HADT · 1247 days ago · 38 km deep · 72 km away
46. 3.3142 km WSW of Adak, AlaskaTue, May 2, 6:48 PM HADT · 1247 days ago · 35 km deep · 70 km away
47. 1.999 km W of Adak, AlaskaTue, May 2, 8:57 PM HADT · 1247 days ago · 3 km deep · 1 km away
48. 1.897 km W of Adak, AlaskaWed, May 3, 6:39 PM HADT · 1246 days ago · 4 km deep · 2 km away
49. 1.699 km W of Adak, AlaskaWed, May 3, 6:40 PM HADT · 1246 days ago · 3 km deep · 1 km away
50. 2.2147 km WSW of Adak, AlaskaThu, May 4, 4:43 AM HADT · 1246 days ago · 23 km deep · 77 km away
51. 2.9140 km W of Adak, AlaskaThu, May 4, 6:04 AM HADT · 1246 days ago · 100 km deep · 42 km away
52. 2.068 km W of Adak, AlaskaThu, May 4, 7:45 AM HADT · 1246 days ago · 94 km deep · 33 km away
53. 2.0102 km W of Adak, AlaskaThu, May 4, 9:37 AM HADT · 1246 days ago · 4 km deep · 4 km away
54. 3.858 km SW of Adak, AlaskaThu, May 4, 10:09 AM HADT · 1246 days ago · 34 km deep · 76 km away
55. 2.0110 km SW of Adak, AlaskaThu, May 4, 10:57 AM HADT · 1246 days ago · 20 km deep · 77 km away
56. 2.1129 km SW of Adak, AlaskaThu, May 4, 3:21 PM HADT · 1245 days ago · 25 km deep · 75 km away
57. 1.8124 km W of Adak, AlaskaThu, May 4, 3:57 PM HADT · 1245 days ago · 14 km deep · 25 km away
58. 1.638 km WSW of Adak, AlaskaFri, May 5, 1:23 AM HADT · 1245 days ago · 15 km deep · 68 km away
59. 1.535 km WSW of Adak, AlaskaFri, May 5, 1:55 AM HADT · 1245 days ago · 20 km deep · 67 km away
60. 1.5100 km WSW of Adak, AlaskaFri, May 5, 7:30 AM HADT · 1245 days ago · 29 km deep · 50 km away

The first 60 of at least 200.

Before

1. 3.2121 km WSW of Adak, AlaskaSat, Apr 22, 7:46 PM HADT · 1257 days ago · 35 km deep · 47 km away
2. 3.390 km SW of Adak, AlaskaSat, Apr 22, 5:32 PM HADT · 1257 days ago · 35 km deep · 60 km away
3. 1.899 km W of Adak, AlaskaSat, Apr 22, 10:06 AM HADT · 1258 days ago · -2 km deep · 0 km away
4. 1.596 km W of Adak, AlaskaFri, Apr 21, 11:53 PM HADT · 1258 days ago · -1 km deep · 4 km away
5. 1.9128 km WSW of Adak, AlaskaFri, Apr 21, 10:52 PM HADT · 1258 days ago · 9 km deep · 36 km away
6. 2.333 km NNW of Adak, AlaskaFri, Apr 21, 8:25 PM HADT · 1258 days ago · 170 km deep · 98 km away
7. 1.870 km SSW of Adak, AlaskaFri, Apr 21, 5:49 PM HADT · 1258 days ago · 19 km deep · 98 km away
8. 3.1154 km SW of Adak, AlaskaFri, Apr 21, 3:16 PM HADT · 1258 days ago · 35 km deep · 91 km away
9. 1.596 km W of Adak, AlaskaFri, Apr 21, 3:13 PM HADT · 1258 days ago · -2 km deep · 4 km away
10. 1.697 km W of Adak, AlaskaFri, Apr 21, 3:03 PM HADT · 1258 days ago · -1 km deep · 3 km away
11. 2.5119 km WSW of Adak, AlaskaFri, Apr 21, 8:30 AM HADT · 1259 days ago · 34 km deep · 43 km away
12. 2.0Andreanof Islands, Aleutian Islands, AlaskaFri, Apr 21, 5:18 AM HADT · 1259 days ago · 3 km deep · 3 km away
13. 2.295 km W of Adak, AlaskaFri, Apr 21, 4:22 AM HADT · 1259 days ago · 5 km deep · 4 km away
14. 1.799 km W of Adak, AlaskaFri, Apr 21, 3:43 AM HADT · 1259 days ago · 4 km deep · 1 km away
15. 3.395 km W of Adak, AlaskaThu, Apr 20, 9:58 PM HADT · 1259 days ago · 5 km deep · 6 km away
16. 2.0Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 20, 4:12 PM HADT · 1259 days ago · 3 km deep · 1 km away
17. 2.5Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 20, 4:12 PM HADT · 1259 days ago · 5 km deep · 1 km away
18. 2.2Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 20, 3:15 PM HADT · 1259 days ago · 2 km deep · 2 km away
19. 1.8Andreanof Islands, Aleutian Islands, AlaskaThu, Apr 20, 2:52 PM HADT · 1259 days ago · 4 km deep · 4 km away
20. 1.796 km W of Adak, AlaskaThu, Apr 20, 2:33 PM HADT · 1259 days ago · -2 km deep · 4 km away

From the USGS Earthquake Hazards Program and its partner networks, event av91860811. Read Thu, Oct 1, 2026, 10:11 AM UTC.