M4.2 earthquake 122 km WSW of Adak, Alaska

Magnitude

4.2 (mb), light

Local time

Wed, May 19, 2021, 6:05 PM HADT

UTC

2021-05-20 03:05:07 UTC

Depth

35.0 km (21.7 mi), shallow

Epicenter

51.516° N, 178.312° W

Region

Alaska

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 6.8 km horizontally, 2.0 km in depth

Magnitude uncertainty

±0.17

Depth from

Operator assigned

Station coverage gap

232°, poorly surrounded by stations

Stations used

20

After

1. 3.975 km WSW of Adak, AlaskaThu, May 20, 10:24 AM HADT · 1953 days ago · 68 km deep · 50 km away
2. 1.979 km W of Adak, AlaskaThu, May 20, 8:56 PM HADT · 1952 days ago · 9 km deep · 53 km away
3. 1.6141 km WSW of Adak, AlaskaFri, May 21, 3:15 AM HADT · 1952 days ago · 23 km deep · 21 km away
4. 2.0157 km WSW of Adak, AlaskaFri, May 21, 11:06 PM HADT · 1951 days ago · 15 km deep · 37 km away
5. 1.581 km W of Adak, AlaskaSun, May 23, 10:39 AM HADT · 1950 days ago · 8 km deep · 51 km away
6. 3.1144 km W of Adak, AlaskaSun, May 23, 12:06 PM HADT · 1950 days ago · 81 km deep · 31 km away
7. 1.5125 km WSW of Adak, AlaskaTue, May 25, 11:51 PM HADT · 1947 days ago · 15 km deep · 15 km away
8. 4.065 km SW of Adak, AlaskaWed, May 26, 3:41 PM HADT · 1947 days ago · 43 km deep · 80 km away
9. 2.7154 km W of Adak, AlaskaThu, May 27, 11:33 AM HADT · 1946 days ago · 90 km deep · 40 km away
10. 1.9128 km WSW of Adak, AlaskaFri, May 28, 7:28 PM HADT · 1944 days ago · 42 km deep · 21 km away
11. 2.0108 km WSW of Adak, AlaskaSat, May 29, 6:57 AM HADT · 1944 days ago · 48 km deep · 24 km away
12. 4.246 km SW of Adak, AlaskaSun, May 30, 1:56 AM HADT · 1943 days ago · 48 km deep · 83 km away
13. 1.7120 km WSW of Adak, AlaskaSun, May 30, 6:11 PM HADT · 1942 days ago · 26 km deep · 7 km away
14. 1.750 km W of Adak, AlaskaSun, May 30, 7:01 PM HADT · 1942 days ago · 71 km deep · 72 km away
15. 3.482 km SW of Adak, AlaskaMon, May 31, 2:54 PM HADT · 1942 days ago · 45 km deep · 53 km away
16. 1.8158 km WSW of Adak, AlaskaSun, Jun 6, 2:12 AM HADT · 1936 days ago · 18 km deep · 36 km away
17. 1.6127 km WSW of Adak, AlaskaSun, Jun 6, 11:37 AM HADT · 1936 days ago · 7 km deep · 9 km away
18. 1.5169 km W of Adak, AlaskaTue, Jun 8, 8:34 AM HADT · 1934 days ago · 9 km deep · 58 km away
19. 2.754 km WSW of Adak, AlaskaThu, Jun 10, 9:48 PM HADT · 1931 days ago · 96 km deep · 68 km away
20. 2.158 km W of Adak, AlaskaThu, Jun 10, 9:48 PM HADT · 1931 days ago · 88 km deep · 72 km away
21. 1.7133 km WSW of Adak, AlaskaFri, Jun 11, 12:04 PM HADT · 1931 days ago · 9 km deep · 21 km away
22. 3.0150 km WSW of Adak, AlaskaFri, Jun 11, 9:19 PM HADT · 1930 days ago · 18 km deep · 29 km away
23. 2.6144 km WSW of Adak, AlaskaFri, Jun 11, 9:19 PM HADT · 1930 days ago · 9 km deep · 22 km away
24. 1.6157 km WSW of Adak, AlaskaSat, Jun 12, 8:17 PM HADT · 1929 days ago · 20 km deep · 38 km away
25. 2.6156 km WSW of Adak, AlaskaTue, Jun 15, 6:28 AM HADT · 1927 days ago · 10 km deep · 39 km away
26. 1.6154 km WSW of Adak, AlaskaWed, Jun 16, 2:27 PM HADT · 1926 days ago · 8 km deep · 32 km away
27. 2.6157 km WSW of Adak, AlaskaFri, Jun 18, 2:04 AM HADT · 1924 days ago · 28 km deep · 35 km away
28. 1.5111 km WSW of Adak, AlaskaFri, Jun 18, 4:54 AM HADT · 1924 days ago · 12 km deep · 12 km away
29. 1.8130 km WSW of Adak, AlaskaFri, Jun 18, 9:39 AM HADT · 1924 days ago · 45 km deep · 23 km away
30. 2.776 km W of Adak, AlaskaFri, Jun 18, 2:45 PM HADT · 1924 days ago · 110 km deep · 48 km away
31. 1.8158 km WSW of Adak, AlaskaSat, Jun 19, 4:34 AM HADT · 1923 days ago · 12 km deep · 39 km away
32. 1.8137 km WSW of Adak, AlaskaSat, Jun 19, 3:43 PM HADT · 1923 days ago · 16 km deep · 21 km away
33. 1.6145 km W of Adak, AlaskaTue, Jun 22, 7:49 PM HADT · 1919 days ago · 7 km deep · 49 km away
34. 1.898 km SW of Adak, AlaskaTue, Jun 22, 9:40 PM HADT · 1919 days ago · 38 km deep · 47 km away
35. 1.5133 km WSW of Adak, AlaskaTue, Jun 22, 10:30 PM HADT · 1919 days ago · 14 km deep · 16 km away
36. 1.888 km W of Adak, AlaskaSun, Jun 27, 3:19 PM HADT · 1915 days ago · 8 km deep · 46 km away
37. 1.652 km SSW of Adak, AlaskaSun, Jun 27, 4:32 PM HADT · 1915 days ago · 35 km deep · 87 km away
38. 1.8200 km W of Adak, AlaskaSun, Jun 27, 8:12 PM HADT · 1914 days ago · 78 km deep · 89 km away
39. 1.769 km WSW of Adak, AlaskaSun, Jun 27, 9:57 PM HADT · 1914 days ago · 52 km deep · 55 km away
40. 1.8133 km WSW of Adak, AlaskaMon, Jun 28, 4:51 AM HADT · 1914 days ago · 22 km deep · 12 km away
41. 2.9107 km WSW of Adak, AlaskaMon, Jun 28, 5:40 AM HADT · 1914 days ago · 49 km deep · 25 km away
42. 1.6123 km WSW of Adak, AlaskaMon, Jun 28, 9:13 AM HADT · 1914 days ago · 42 km deep · 18 km away
43. 1.8161 km WSW of Adak, AlaskaMon, Jun 28, 11:04 AM HADT · 1914 days ago · 23 km deep · 38 km away
44. 1.7138 km WSW of Adak, AlaskaMon, Jun 28, 11:58 AM HADT · 1914 days ago · 41 km deep · 27 km away
45. 1.7126 km WSW of Adak, AlaskaMon, Jun 28, 2:06 PM HADT · 1914 days ago · 25 km deep · 12 km away
46. 1.8131 km WSW of Adak, AlaskaWed, Jun 30, 6:15 PM HADT · 1911 days ago · 13 km deep · 18 km away
47. 1.972 km SW of Adak, AlaskaThu, Jul 1, 10:46 AM HADT · 1911 days ago · 34 km deep · 57 km away
48. 1.784 km SW of Adak, AlaskaFri, Jul 2, 1:17 PM HADT · 1910 days ago · 26 km deep · 48 km away
49. 1.5134 km SW of Adak, AlaskaFri, Jul 2, 5:14 PM HADT · 1910 days ago · 26 km deep · 37 km away
50. 1.648 km WSW of Adak, AlaskaFri, Jul 2, 8:06 PM HADT · 1909 days ago · 70 km deep · 74 km away
51. 1.658 km W of Adak, AlaskaFri, Jul 2, 10:25 PM HADT · 1909 days ago · 115 km deep · 69 km away
52. 1.867 km SSW of Adak, AlaskaSat, Jul 3, 3:48 AM HADT · 1909 days ago · 26 km deep · 95 km away
53. 1.7152 km WSW of Adak, AlaskaSat, Jul 3, 9:31 AM HADT · 1909 days ago · 25 km deep · 41 km away
54. 2.4104 km WNW of Adak, AlaskaSat, Jul 3, 1:22 PM HADT · 1909 days ago · 247 km deep · 76 km away
55. 1.6194 km WSW of Adak, AlaskaSat, Jul 3, 9:59 PM HADT · 1908 days ago · 22 km deep · 72 km away
56. 1.847 km SW of Adak, AlaskaSat, Jul 3, 10:14 PM HADT · 1908 days ago · 64 km deep · 80 km away
57. 1.7131 km W of Adak, AlaskaSun, Jul 4, 2:43 AM HADT · 1908 days ago · 8 km deep · 26 km away
58. 3.9117 km SW of Adak, AlaskaSun, Jul 4, 10:05 AM HADT · 1908 days ago · 42 km deep · 37 km away
59. 3.638 km SW of Adak, AlaskaSun, Jul 4, 4:47 PM HADT · 1908 days ago · 73 km deep · 90 km away
60. 3.7135 km SW of Adak, AlaskaSun, Jul 4, 5:14 PM HADT · 1908 days ago · 27 km deep · 35 km away

The first 60 of 106.

Before

1. 2.9172 km W of Adak, AlaskaMon, May 17, 5:42 AM HADT · 1956 days ago · 10 km deep · 63 km away
2. 1.5131 km WSW of Adak, AlaskaMon, May 17, 3:49 AM HADT · 1956 days ago · 5 km deep · 19 km away
3. 1.652 km SW of Adak, AlaskaFri, May 14, 8:56 AM HADT · 1959 days ago · 45 km deep · 81 km away
4. 2.1184 km WSW of Adak, AlaskaFri, May 14, 3:18 AM HADT · 1959 days ago · 23 km deep · 63 km away
5. 1.8131 km WSW of Adak, AlaskaThu, May 13, 10:11 PM HADT · 1959 days ago · 12 km deep · 15 km away
6. 1.974 km SW of Adak, AlaskaThu, May 13, 7:39 PM HADT · 1959 days ago · 26 km deep · 57 km away
7. 3.4202 km WSW of Adak, AlaskaThu, May 13, 4:31 PM HADT · 1960 days ago · 27 km deep · 80 km away
8. 1.963 km W of Adak, AlaskaThu, May 13, 7:23 AM HADT · 1960 days ago · 103 km deep · 63 km away
9. 1.9169 km WSW of Adak, AlaskaSat, May 8, 11:24 AM HADT · 1965 days ago · 13 km deep · 46 km away
10. 1.956 km W of Adak, AlaskaFri, May 7, 5:33 AM HADT · 1966 days ago · 11 km deep · 67 km away
11. 2.057 km W of Adak, AlaskaFri, May 7, 5:33 AM HADT · 1966 days ago · -2 km deep · 68 km away
12. 1.776 km W of Adak, AlaskaThu, May 6, 10:17 AM HADT · 1967 days ago · 1 km deep · 54 km away
13. 1.777 km W of Adak, AlaskaThu, May 6, 7:39 AM HADT · 1967 days ago · 3 km deep · 53 km away
14. 2.057 km W of Adak, AlaskaWed, May 5, 9:18 PM HADT · 1967 days ago · -2 km deep · 69 km away
15. 3.8154 km WSW of Adak, AlaskaWed, May 5, 4:34 AM HADT · 1968 days ago · 15 km deep · 35 km away
16. 2.0148 km WSW of Adak, AlaskaWed, May 5, 4:08 AM HADT · 1968 days ago · 9 km deep · 26 km away
17. 1.857 km W of Adak, AlaskaTue, May 4, 11:20 PM HADT · 1968 days ago · -2 km deep · 68 km away
18. 1.9124 km WSW of Adak, AlaskaTue, May 4, 12:51 PM HADT · 1969 days ago · 27 km deep · 23 km away
19. 1.8131 km WSW of Adak, AlaskaTue, May 4, 3:42 AM HADT · 1969 days ago · 13 km deep · 13 km away
20. 1.767 km WSW of Adak, AlaskaMon, May 3, 8:00 PM HADT · 1969 days ago · 72 km deep · 55 km away

From the USGS Earthquake Hazards Program and its partner networks, event us6000eeu5. Read Thu, Sep 24, 2026, 2:34 PM UTC.