M3.9 earthquake 82 km SW of Atka, Alaska

Magnitude

3.9 (mb), minor

Local time

Sun, Jul 18, 2021, 11:30 AM HADT

UTC

2021-07-18 20:30:13 UTC

Depth

48.8 km (30.3 mi), shallow

Epicenter

51.775° N, 175.186° W

Region

Alaska

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 5.4 km horizontally, 2.4 km in depth

Magnitude uncertainty

±0.07

Depth from

From location

Station coverage gap

68°

Stations used

83

After

1. 2.361 km ENE of Adak, AlaskaMon, Jul 19, 5:24 PM HADT · 1896 days ago · 101 km deep · 65 km away
2. 2.06 km SSE of Atka, AlaskaMon, Jul 19, 5:54 PM HADT · 1896 days ago · 79 km deep · 82 km away
3. 2.6104 km SE of Adak, AlaskaMon, Jul 19, 7:11 PM HADT · 1896 days ago · 2 km deep · 76 km away
4. 1.818 km W of Atka, AlaskaMon, Jul 19, 11:49 PM HADT · 1896 days ago · 73 km deep · 65 km away
5. 1.983 km SW of Atka, AlaskaTue, Jul 20, 7:53 PM HADT · 1895 days ago · 26 km deep · 16 km away
6. 3.766 km SSE of Adak, AlaskaTue, Jul 20, 11:04 PM HADT · 1895 days ago · 37 km deep · 100 km away
7. 2.183 km SE of Adak, AlaskaWed, Jul 21, 4:20 AM HADT · 1894 days ago · 21 km deep · 51 km away
8. 1.531 km SSE of Adak, AlaskaWed, Jul 21, 6:15 AM HADT · 1894 days ago · 59 km deep · 93 km away
9. 2.317 km NNE of Atka, AlaskaWed, Jul 21, 7:12 AM HADT · 1894 days ago · 197 km deep · 99 km away
10. 2.092 km S of Atka, AlaskaWed, Jul 21, 12:44 PM HADT · 1894 days ago · 19 km deep · 91 km away
11. 1.667 km SE of Adak, AlaskaWed, Jul 21, 8:44 PM HADT · 1894 days ago · 22 km deep · 67 km away
12. 2.095 km SSW of Atka, AlaskaWed, Jul 21, 8:52 PM HADT · 1894 days ago · 16 km deep · 41 km away
13. 1.697 km SSW of Atka, AlaskaThu, Jul 22, 12:31 AM HADT · 1893 days ago · 26 km deep · 39 km away
14. 1.815 km NE of Adak, AlaskaThu, Jul 22, 3:43 AM HADT · 1893 days ago · 99 km deep · 89 km away
15. 1.775 km SW of Atka, AlaskaThu, Jul 22, 9:18 AM HADT · 1893 days ago · 35 km deep · 19 km away
16. 2.882 km E of Adak, AlaskaThu, Jul 22, 12:02 PM HADT · 1893 days ago · 68 km deep · 20 km away
17. 1.918 km WSW of Atka, AlaskaThu, Jul 22, 1:05 PM HADT · 1893 days ago · 147 km deep · 64 km away
18. 1.948 km E of Adak, AlaskaThu, Jul 22, 2:36 PM HADT · 1893 days ago · 178 km deep · 53 km away
19. 1.968 km ENE of Adak, AlaskaThu, Jul 22, 4:24 PM HADT · 1893 days ago · 166 km deep · 44 km away
20. 2.1Andreanof Islands, Aleutian Islands, AlaskaThu, Jul 22, 5:28 PM HADT · 1893 days ago · 63 km deep · 51 km away
21. 2.153 km SE of Atka, AlaskaThu, Jul 22, 5:53 PM HADT · 1893 days ago · 17 km deep · 98 km away
22. 2.675 km S of Atka, AlaskaThu, Jul 22, 6:54 PM HADT · 1893 days ago · 22 km deep · 68 km away
23. 1.867 km ENE of Adak, AlaskaFri, Jul 23, 10:34 AM HADT · 1892 days ago · 147 km deep · 45 km away
24. 3.238 km ENE of Adak, AlaskaSat, Jul 24, 12:46 AM HADT · 1891 days ago · 146 km deep · 71 km away
25. 2.190 km SW of Atka, AlaskaSat, Jul 24, 12:02 PM HADT · 1891 days ago · 42 km deep · 13 km away
26. 1.568 km SW of Atka, AlaskaSat, Jul 24, 1:32 PM HADT · 1891 days ago · 28 km deep · 24 km away
27. 2.291 km ESE of Adak, AlaskaSat, Jul 24, 6:38 PM HADT · 1891 days ago · 45 km deep · 13 km away
28. 2.856 km E of Adak, AlaskaSat, Jul 24, 8:26 PM HADT · 1891 days ago · 67 km deep · 44 km away
29. 1.773 km SSE of Adak, AlaskaSun, Jul 25, 4:05 AM HADT · 1890 days ago · 25 km deep · 97 km away
30. 2.920 km WNW of Atka, AlaskaSun, Jul 25, 9:12 AM HADT · 1890 days ago · 201 km deep · 73 km away
31. 3.647 km SE of Adak, AlaskaMon, Jul 26, 12:47 AM HADT · 1889 days ago · 48 km deep · 74 km away
32. 1.978 km ENE of Adak, AlaskaMon, Jul 26, 1:39 AM HADT · 1889 days ago · 166 km deep · 59 km away
33. 3.079 km ENE of Adak, AlaskaMon, Jul 26, 9:45 AM HADT · 1889 days ago · 191 km deep · 63 km away
34. 1.650 km ENE of Adak, AlaskaMon, Jul 26, 3:41 PM HADT · 1889 days ago · 148 km deep · 66 km away
35. 1.776 km ENE of Adak, AlaskaTue, Jul 27, 1:13 AM HADT · 1888 days ago · 179 km deep · 46 km away
36. 2.129 km NNW of Atka, AlaskaTue, Jul 27, 3:27 AM HADT · 1888 days ago · 185 km deep · 94 km away
37. 1.715 km E of Adak, AKTue, Jul 27, 10:29 AM HADT · 1888 days ago · 76 km deep · 85 km away
38. 3.035 km S of Adak, AlaskaTue, Jul 27, 3:00 PM HADT · 1888 days ago · 46 km deep · 98 km away
39. 1.860 km SE of Adak, AlaskaTue, Jul 27, 6:57 PM HADT · 1888 days ago · 26 km deep · 62 km away
40. 1.837 km ENE of Adak, AlaskaWed, Jul 28, 11:37 PM HADT · 1887 days ago · 147 km deep · 72 km away
41. 1.682 km ENE of Adak, AlaskaThu, Jul 29, 3:50 AM HADT · 1886 days ago · 13 km deep · 41 km away
42. 3.172 km ENE of Adak, AlaskaThu, Jul 29, 4:54 PM HADT · 1886 days ago · 98 km deep · 47 km away
43. 2.055 km ENE of Adak, AlaskaThu, Jul 29, 11:20 PM HADT · 1886 days ago · 179 km deep · 54 km away
44. 3.563 km SE of Adak, AlaskaFri, Jul 30, 4:55 AM HADT · 1885 days ago · 35 km deep · 73 km away
45. 1.954 km ENE of Adak, AlaskaFri, Jul 30, 5:12 AM HADT · 1885 days ago · 211 km deep · 62 km away
46. 1.685 km WSW of Atka, AlaskaFri, Jul 30, 5:25 AM HADT · 1885 days ago · 78 km deep · 26 km away
47. 2.896 km SW of Atka, AlaskaFri, Jul 30, 5:38 AM HADT · 1885 days ago · 35 km deep · 23 km away
48. 1.9Andreanof Islands, Aleutian Islands, AlaskaFri, Jul 30, 10:53 AM HADT · 1885 days ago · 29 km deep · 75 km away
49. 1.666 km SE of Adak, AlaskaFri, Jul 30, 5:02 PM HADT · 1885 days ago · 26 km deep · 63 km away
50. 2.066 km NE of Adak, AlaskaFri, Jul 30, 9:04 PM HADT · 1885 days ago · 217 km deep · 84 km away
51. 3.054 km ESE of Adak, AlaskaSat, Jul 31, 8:24 AM HADT · 1884 days ago · 42 km deep · 53 km away
52. 1.912 km S of Atka, AlaskaSat, Jul 31, 3:14 PM HADT · 1884 days ago · 24 km deep · 76 km away
53. 1.578 km SSE of Adak, AlaskaSun, Aug 1, 4:50 AM HADT · 1883 days ago · 19 km deep · 98 km away
54. 1.658 km SE of Adak, AlaskaSun, Aug 1, 7:39 AM HADT · 1883 days ago · 26 km deep · 71 km away
55. 2.741 km SSW of Atka, AlaskaSun, Aug 1, 5:11 PM HADT · 1883 days ago · 210 km deep · 48 km away
56. 1.911 km S of Atka, AlaskaSun, Aug 1, 10:53 PM HADT · 1883 days ago · 74 km deep · 75 km away
57. 3.517 km SE of Adak, AlaskaSun, Aug 1, 11:48 PM HADT · 1883 days ago · 69 km deep · 85 km away
58. 3.244 km SSE of Adak, AlaskaMon, Aug 2, 12:36 AM HADT · 1882 days ago · 44 km deep · 90 km away
59. 3.110 km NW of Atka, AlaskaTue, Aug 3, 5:56 AM HADT · 1881 days ago · 210 km deep · 80 km away
60. 1.559 km SE of Adak, AlaskaTue, Aug 3, 6:20 PM HADT · 1881 days ago · 23 km deep · 73 km away

The first 60 of 185.

Before

1. 1.6Andreanof Islands, Aleutian Islands, AlaskaSun, Jul 18, 12:41 AM HADT · 1897 days ago · 26 km deep · 29 km away
2. 2.636 km NW of Atka, AlaskaSat, Jul 17, 3:16 PM HADT · 1898 days ago · 176 km deep · 77 km away
3. 2.460 km NE of Adak, AlaskaFri, Jul 16, 7:18 PM HADT · 1899 days ago · 183 km deep · 81 km away
4. 1.847 km E of Adak, AlaskaFri, Jul 16, 5:59 PM HADT · 1899 days ago · 155 km deep · 56 km away
5. 1.858 km WSW of Atka, AlaskaFri, Jul 16, 6:55 AM HADT · 1899 days ago · 73 km deep · 32 km away
6. 3.380 km E of Adak, AlaskaThu, Jul 15, 7:49 PM HADT · 1900 days ago · 10 km deep · 23 km away
7. 1.571 km WSW of Atka, AlaskaThu, Jul 15, 3:21 AM HADT · 1900 days ago · 67 km deep · 12 km away
8. 1.5106 km S of Atka, AlaskaThu, Jul 15, 2:05 AM HADT · 1900 days ago · 26 km deep · 84 km away
9. 1.782 km SE of Adak, AlaskaWed, Jul 14, 4:14 AM HADT · 1901 days ago · 22 km deep · 51 km away
10. 1.742 km ENE of Adak, AlaskaWed, Jul 14, 3:20 AM HADT · 1901 days ago · 4 km deep · 70 km away
11. 1.596 km SE of Adak, AlaskaWed, Jul 14, 2:46 AM HADT · 1901 days ago · 6 km deep · 56 km away
12. 1.654 km ENE of Adak, AlaskaTue, Jul 13, 7:09 PM HADT · 1902 days ago · 170 km deep · 59 km away
13. 1.531 km SSW of Atka, AlaskaTue, Jul 13, 3:00 PM HADT · 1902 days ago · 70 km deep · 59 km away
14. 2.130 km SSE of Atka, AlaskaTue, Jul 13, 10:17 AM HADT · 1902 days ago · 2 km deep · 83 km away
15. 1.853 km ENE of Adak, AlaskaTue, Jul 13, 8:57 AM HADT · 1902 days ago · 146 km deep · 55 km away
16. 1.944 km E of Adak, AlaskaTue, Jul 13, 3:27 AM HADT · 1902 days ago · 125 km deep · 60 km away
17. 1.6Andreanof Islands, Aleutian Islands, AlaskaTue, Jul 13, 3:10 AM HADT · 1902 days ago · 33 km deep · 85 km away
18. 2.075 km ENE of Adak, AlaskaTue, Jul 13, 2:07 AM HADT · 1902 days ago · 94 km deep · 47 km away
19. 2.519 km SW of Atka, AlaskaMon, Jul 12, 1:04 PM HADT · 1903 days ago · 186 km deep · 64 km away
20. 1.544 km SSE of Adak, AlaskaMon, Jul 12, 10:38 AM HADT · 1903 days ago · 32 km deep · 88 km away

From the USGS Earthquake Hazards Program and its partner networks, event us7000en94 (also filed as ak02195g16t4). Read Sun, Sep 27, 2026, 8:23 PM UTC.