M1.6 earthquake 256 km W of Adak, Alaska

Magnitude

1.6 (ml), micro

Local time

Tue, Aug 17, 2021, 10:06 PM GMT+12

UTC

2021-08-17 10:06:07 UTC

Depth

15.3 km (9.5 mi), shallow

Epicenter

51.921° N, 179.637° E

Region

Alaska

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 1.8 km horizontally, 1.6 km in depth

Magnitude uncertainty

±0.20

Depth from

From location

Station coverage gap

128°

Stations used

6

After

1. 1.5267 km W of Adak, AlaskaTue, Aug 17, 10:27 PM GMT+12 · 1864 days ago · 67 km deep · 37 km away
2. 2.1Rat Islands, Aleutian Islands, AlaskaWed, Aug 18, 5:02 AM GMT+12 · 1864 days ago · 138 km deep · 58 km away
3. 3.2216 km WSW of Adak, AlaskaTue, Aug 17, 10:27 AM HADT · 1864 days ago · 35 km deep · 71 km away
4. 2.3169 km W of Adak, AlaskaTue, Aug 17, 6:25 PM HADT · 1863 days ago · 243 km deep · 87 km away
5. 1.8243 km WSW of Adak, AlaskaTue, Aug 17, 8:48 PM GMT-12 · 1863 days ago · 39 km deep · 95 km away
6. 2.6257 km W of Adak, AlaskaWed, Aug 18, 9:10 PM GMT+12 · 1863 days ago · 10 km deep · 1 km away
7. 1.8175 km WSW of Adak, AlaskaWed, Aug 18, 6:20 PM HADT · 1862 days ago · 72 km deep · 99 km away
8. 2.0294 km WSW of Adak, AlaskaThu, Aug 19, 4:43 PM GMT+12 · 1862 days ago · 23 km deep · 87 km away
9. 3.5Rat Islands, Aleutian Islands, AlaskaFri, Aug 20, 4:54 AM GMT+12 · 1862 days ago · 57 km deep · 75 km away
10. 1.6219 km W of Adak, AlaskaThu, Aug 19, 8:30 AM HADT · 1862 days ago · 92 km deep · 41 km away
11. 1.6197 km WSW of Adak, AlaskaThu, Aug 19, 9:53 AM HADT · 1862 days ago · 75 km deep · 80 km away
12. 1.5Rat Islands, Aleutian Islands, AlaskaFri, Aug 20, 3:44 PM GMT+12 · 1861 days ago · 65 km deep · 92 km away
13. 3.6262 km W of Adak, AlaskaFri, Aug 20, 6:10 PM GMT+12 · 1861 days ago · 80 km deep · 31 km away
14. 1.7296 km WSW of Adak, AlaskaSat, Aug 21, 2:22 AM GMT+12 · 1861 days ago · 42 km deep · 80 km away
15. 2.9256 km WSW of Adak, AlaskaSat, Aug 21, 9:32 AM GMT+12 · 1861 days ago · 25 km deep · 75 km away
16. 3.8272 km WSW of Adak, AlaskaSat, Aug 21, 10:17 AM GMT+12 · 1861 days ago · 26 km deep · 83 km away
17. 1.6Rat Islands, Aleutian Islands, AlaskaMon, Aug 23, 10:41 AM GMT+12 · 1859 days ago · 89 km deep · 62 km away
18. 1.9203 km W of Adak, AlaskaSun, Aug 22, 3:39 PM HADT · 1859 days ago · 119 km deep · 53 km away
19. 1.8Rat Islands, Aleutian Islands, AlaskaMon, Aug 23, 4:24 PM GMT+12 · 1858 days ago · 86 km deep · 64 km away
20. 1.6247 km WSW of Adak, AlaskaTue, Aug 24, 9:11 AM GMT+12 · 1858 days ago · 63 km deep · 50 km away
21. 1.7252 km W of Adak, AlaskaTue, Aug 24, 1:01 PM GMT+12 · 1858 days ago · 145 km deep · 15 km away
22. 1.8263 km W of Adak, AlaskaTue, Aug 24, 10:57 PM GMT+12 · 1857 days ago · 169 km deep · 22 km away
23. 2.5Rat Islands, Aleutian Islands, AlaskaWed, Aug 25, 3:47 AM GMT+12 · 1857 days ago · 94 km deep · 96 km away
24. 1.7Rat Islands, Aleutian Islands, AlaskaWed, Aug 25, 5:30 AM GMT+12 · 1857 days ago · 51 km deep · 68 km away
25. 1.9201 km WSW of Adak, AlaskaTue, Aug 24, 12:02 PM HADT · 1857 days ago · 70 km deep · 77 km away
26. 1.7266 km WSW of Adak, AlaskaWed, Aug 25, 4:50 PM GMT+12 · 1856 days ago · 19 km deep · 82 km away
27. 4.8Rat Islands, Aleutian Islands, AlaskaWed, Aug 25, 10:15 PM GMT+12 · 1856 days ago · 126 km deep · 95 km away
28. 1.6294 km WSW of Adak, AlaskaThu, Aug 26, 8:28 PM GMT+12 · 1855 days ago · 37 km deep · 78 km away
29. 3.1248 km W of Adak, AlaskaFri, Aug 27, 7:07 AM GMT+12 · 1855 days ago · 77 km deep · 37 km away
30. 2.6Rat Islands, Aleutian Islands, AlaskaFri, Aug 27, 11:15 PM GMT+12 · 1854 days ago · 108 km deep · 82 km away
31. 3.0254 km WNW of Adak, AlaskaSat, Aug 28, 2:30 AM GMT+12 · 1854 days ago · 188 km deep · 52 km away
32. 1.5171 km W of Adak, AlaskaFri, Aug 27, 1:13 PM HADT · 1854 days ago · 5 km deep · 89 km away
33. 1.5254 km WSW of Adak, AlaskaSat, Aug 28, 11:38 PM GMT+12 · 1853 days ago · 16 km deep · 62 km away
34. 1.8211 km W of Adak, AlaskaSat, Aug 28, 6:19 PM HADT · 1852 days ago · 92 km deep · 51 km away
35. 1.9230 km W of Adak, AlaskaSat, Aug 28, 8:03 PM HADT · 1852 days ago · 93 km deep · 32 km away
36. 2.6Rat Islands, Aleutian Islands, AlaskaMon, Aug 30, 3:31 AM GMT+12 · 1852 days ago · 138 km deep · 90 km away
37. 1.8Rat Islands, Aleutian Islands, AlaskaMon, Aug 30, 8:22 PM GMT+12 · 1851 days ago · 131 km deep · 60 km away
38. 1.9192 km W of Adak, AlaskaMon, Aug 30, 12:21 PM HADT · 1851 days ago · 148 km deep · 71 km away
39. 2.0Rat Islands, Aleutian Islands, AlaskaTue, Aug 31, 11:12 AM GMT+12 · 1851 days ago · 93 km deep · 45 km away
40. 1.9243 km W of Adak, AlaskaTue, Aug 31, 3:30 PM GMT+12 · 1850 days ago · 70 km deep · 32 km away
41. 1.7Rat Islands, Aleutian Islands, AlaskaTue, Aug 31, 6:11 PM GMT+12 · 1850 days ago · 21 km deep · 93 km away
42. 2.0Rat Islands, Aleutian Islands, AlaskaTue, Aug 31, 7:59 PM GMT+12 · 1850 days ago · 129 km deep · 96 km away
43. 1.9257 km WSW of Adak, AlaskaThu, Sep 2, 6:05 PM GMT+12 · 1848 days ago · 57 km deep · 53 km away
44. 1.6248 km WSW of Adak, AlaskaThu, Sep 2, 7:46 PM GMT+12 · 1848 days ago · 48 km deep · 63 km away
45. 2.6221 km WSW of Adak, AlaskaThu, Sep 2, 3:19 AM HADT · 1848 days ago · 88 km deep · 75 km away
46. 1.5272 km W of Adak, AlaskaFri, Sep 3, 2:34 AM GMT+12 · 1848 days ago · 70 km deep · 42 km away
47. 1.6232 km WSW of Adak, AlaskaFri, Sep 3, 1:30 AM HADT · 1847 days ago · 11 km deep · 54 km away
48. 1.9232 km WSW of Adak, AlaskaFri, Sep 3, 6:10 AM HADT · 1847 days ago · 7 km deep · 56 km away
49. 1.6234 km WSW of Adak, AlaskaFri, Sep 3, 6:11 AM HADT · 1847 days ago · 13 km deep · 54 km away
50. 1.8231 km WSW of Adak, AlaskaFri, Sep 3, 8:43 AM HADT · 1847 days ago · 13 km deep · 54 km away
51. 1.7299 km WSW of Adak, AlaskaSat, Sep 4, 3:16 PM GMT+12 · 1846 days ago · 19 km deep · 99 km away
52. 1.7271 km W of Adak, AlaskaSat, Sep 4, 5:27 PM GMT+12 · 1846 days ago · 63 km deep · 39 km away
53. 2.5Rat Islands, Aleutian Islands, AlaskaSat, Sep 4, 6:23 PM GMT+12 · 1846 days ago · 95 km deep · 57 km away
54. 1.8Rat Islands, Aleutian Islands, AlaskaSun, Sep 5, 7:48 PM GMT+12 · 1845 days ago · 11 km deep · 96 km away
55. 1.7Rat Islands, Aleutian Islands, AlaskaMon, Sep 6, 1:12 AM GMT+12 · 1845 days ago · 12 km deep · 97 km away
56. 1.8Rat Islands, Aleutian Islands, AlaskaMon, Sep 6, 1:16 AM GMT+12 · 1845 days ago · 13 km deep · 93 km away
57. 1.6Rat Islands, Aleutian Islands, AlaskaMon, Sep 6, 1:17 AM GMT+12 · 1845 days ago · 13 km deep · 92 km away
58. 1.8Rat Islands, Aleutian Islands, AlaskaMon, Sep 6, 1:47 AM GMT+12 · 1845 days ago · 12 km deep · 99 km away
59. 1.6Rat Islands, Aleutian Islands, AlaskaMon, Sep 6, 2:11 AM GMT+12 · 1845 days ago · 12 km deep · 87 km away
60. 1.6Rat Islands, Aleutian Islands, AlaskaMon, Sep 6, 4:49 AM GMT+12 · 1845 days ago · 11 km deep · 99 km away

The first 60 of 105.

Before

1. 1.7228 km WSW of Adak, AlaskaSun, Aug 15, 8:44 PM HADT · 1865 days ago · 19 km deep · 81 km away
2. 1.8216 km W of Adak, AlaskaSun, Aug 15, 7:39 PM HADT · 1865 days ago · 74 km deep · 53 km away
3. 2.7Rat Islands, Aleutian Islands, AlaskaSun, Aug 15, 11:33 AM GMT+12 · 1867 days ago · 124 km deep · 85 km away
4. 1.6Rat Islands, Aleutian Islands, AlaskaSun, Aug 15, 8:17 AM GMT+12 · 1867 days ago · 39 km deep · 86 km away
5. 2.0245 km WSW of Adak, AlaskaThu, Aug 12, 7:46 AM GMT-12 · 1869 days ago · 13 km deep · 96 km away
6. 1.5265 km W of Adak, AlaskaFri, Aug 13, 1:40 AM GMT+12 · 1869 days ago · 20 km deep · 11 km away
7. 1.5213 km W of Adak, AlaskaWed, Aug 11, 9:01 PM HADT · 1869 days ago · 73 km deep · 57 km away
8. 3.3233 km WSW of Adak, AlaskaWed, Aug 11, 5:23 PM HADT · 1870 days ago · 65 km deep · 58 km away
9. 1.6243 km WSW of Adak, AlaskaThu, Aug 12, 12:22 PM GMT+12 · 1870 days ago · 17 km deep · 70 km away
10. 1.7Rat Islands, Aleutian Islands, AlaskaThu, Aug 12, 10:02 AM GMT+12 · 1870 days ago · 18 km deep · 92 km away
11. 2.0Rat Islands, Aleutian Islands, AlaskaThu, Aug 12, 4:34 AM GMT+12 · 1870 days ago · 142 km deep · 83 km away
12. 1.6206 km WSW of Adak, AlaskaWed, Aug 11, 5:16 AM HADT · 1870 days ago · 47 km deep · 87 km away
13. 2.0230 km W of Adak, AlaskaTue, Aug 10, 10:42 PM HADT · 1870 days ago · 186 km deep · 42 km away
14. 1.9245 km W of Adak, AlaskaWed, Aug 11, 5:42 PM GMT+12 · 1870 days ago · 168 km deep · 21 km away
15. 1.7184 km W of Adak, AlaskaTue, Aug 10, 6:35 PM HADT · 1870 days ago · 139 km deep · 73 km away
16. 2.9294 km WSW of Adak, AlaskaWed, Aug 11, 2:17 PM GMT+12 · 1871 days ago · 59 km deep · 64 km away
17. 3.0270 km WSW of Adak, AlaskaTue, Aug 10, 1:32 PM GMT+12 · 1872 days ago · 51 km deep · 65 km away
18. 1.5234 km WSW of Adak, AlaskaMon, Aug 9, 3:31 PM HADT · 1872 days ago · 53 km deep · 56 km away
19. 4.0204 km W of Adak, AlaskaMon, Aug 9, 4:39 AM HADT · 1872 days ago · 169 km deep · 54 km away
20. 1.7227 km WSW of Adak, AlaskaMon, Aug 9, 3:03 AM HADT · 1872 days ago · 50 km deep · 70 km away

From the USGS Earthquake Hazards Program and its partner networks, event av91341756. Read Thu, Sep 24, 2026, 2:27 PM UTC.