M4.0 earthquake 236 km WSW of Adak, Alaska

Magnitude

4.0 (mb), light

Local time

Sun, Jan 3, 2021, 3:20 AM HAST

UTC

2021-01-03 13:20:04 UTC

Depth

30.9 km (19.2 mi), shallow

Epicenter

51.243° N, 179.898° W

Region

Alaska

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 13.3 km horizontally, 10.3 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

218°, poorly surrounded by stations

Stations used

32

After

1. 3.7230 km W of Adak, AlaskaSun, Jan 3, 3:45 AM HAST · 2090 days ago · 6 km deep · 54 km away
2. 4.0231 km WSW of Adak, AlaskaSun, Jan 3, 12:51 PM HAST · 2090 days ago · 35 km deep · 9 km away
3. 2.1176 km WSW of Adak, AlaskaMon, Jan 4, 5:25 AM HAST · 2089 days ago · 76 km deep · 62 km away
4. 2.3241 km WSW of Adak, AlaskaMon, Jan 4, 3:39 AM GMT-12 · 2089 days ago · 47 km deep · 19 km away
5. 2.9253 km WSW of Adak, AlaskaTue, Jan 5, 3:22 PM GMT+12 · 2089 days ago · 35 km deep · 17 km away
6. 3.2241 km WSW of Adak, AlaskaMon, Jan 4, 6:01 PM GMT-12 · 2088 days ago · 23 km deep · 12 km away
7. 4.6Rat Islands, Aleutian Islands, AlaskaWed, Jan 6, 12:25 PM GMT+12 · 2088 days ago · 35 km deep · 85 km away
8. 3.1245 km WSW of Adak, AlaskaTue, Jan 5, 2:09 PM GMT-12 · 2088 days ago · 10 km deep · 27 km away
9. 1.9185 km WSW of Adak, AlaskaTue, Jan 5, 4:51 PM HAST · 2088 days ago · 12 km deep · 52 km away
10. 2.6253 km WSW of Adak, AlaskaWed, Jan 6, 10:33 PM GMT+12 · 2087 days ago · 35 km deep · 27 km away
11. 2.6247 km WSW of Adak, AlaskaTue, Jan 5, 11:22 PM GMT-12 · 2087 days ago · 10 km deep · 46 km away
12. 3.5210 km WSW of Adak, AlaskaWed, Jan 6, 1:36 AM HAST · 2087 days ago · 35 km deep · 35 km away
13. 4.1193 km WSW of Adak, AlaskaWed, Jan 6, 8:29 AM HAST · 2087 days ago · 28 km deep · 51 km away
14. 3.2250 km WSW of Adak, AlaskaWed, Jan 6, 2:28 PM GMT-12 · 2087 days ago · 35 km deep · 24 km away
15. 3.6240 km WSW of Adak, AlaskaWed, Jan 6, 5:11 PM GMT-12 · 2086 days ago · 24 km deep · 6 km away
16. 2.9258 km WSW of Adak, AlaskaThu, Jan 7, 9:25 PM GMT+12 · 2086 days ago · 33 km deep · 22 km away
17. 2.8205 km WSW of Adak, AlaskaThu, Jan 7, 10:54 PM HAST · 2085 days ago · 35 km deep · 40 km away
18. 2.0231 km WSW of Adak, AlaskaThu, Jan 7, 11:32 PM HAST · 2085 days ago · 8 km deep · 23 km away
19. 2.2141 km WSW of Adak, AlaskaSat, Jan 9, 4:19 AM HAST · 2084 days ago · 22 km deep · 96 km away
20. 1.8172 km W of Adak, AlaskaMon, Jan 18, 12:34 PM HAST · 2075 days ago · 11 km deep · 74 km away
21. 2.7157 km WSW of Adak, AlaskaWed, Jan 20, 4:19 AM HAST · 2073 days ago · 17 km deep · 82 km away
22. 2.2152 km WSW of Adak, AlaskaWed, Jan 20, 11:41 AM HAST · 2073 days ago · 22 km deep · 97 km away
23. 2.3188 km W of Adak, AlaskaWed, Jan 20, 4:44 PM HAST · 2073 days ago · 95 km deep · 95 km away
24. 2.1194 km W of Adak, AlaskaThu, Jan 21, 1:25 AM HAST · 2072 days ago · 89 km deep · 57 km away
25. 2.1162 km W of Adak, AlaskaFri, Jan 22, 3:10 PM HAST · 2071 days ago · 92 km deep · 80 km away
26. 4.0Rat Islands, Aleutian Islands, AlaskaMon, Jan 25, 8:06 PM GMT+12 · 2068 days ago · 48 km deep · 97 km away
27. 2.7243 km WSW of Adak, AlaskaFri, Jan 29, 6:43 PM GMT-12 · 2063 days ago · 21 km deep · 19 km away
28. 2.8252 km WSW of Adak, AlaskaTue, Feb 2, 5:12 AM GMT+12 · 2061 days ago · 35 km deep · 21 km away
29. 1.9178 km WSW of Adak, AlaskaMon, Feb 1, 1:15 PM HAST · 2061 days ago · 1 km deep · 61 km away
30. 1.9149 km WSW of Adak, AlaskaWed, Feb 3, 8:34 PM HAST · 2058 days ago · 10 km deep · 88 km away
31. 2.8154 km SW of Adak, AlaskaTue, Feb 9, 4:44 AM HAST · 2053 days ago · 31 km deep · 99 km away
32. 3.0242 km WSW of Adak, AlaskaThu, Feb 11, 12:41 PM GMT-12 · 2051 days ago · 13 km deep · 24 km away
33. 4.8184 km WSW of Adak, AlaskaSun, Feb 14, 9:13 AM HAST · 2048 days ago · 23 km deep · 53 km away
34. 3.3Andreanof Islands, Aleutian Islands, AlaskaSun, Feb 14, 9:26 AM HAST · 2048 days ago · 35 km deep · 46 km away
35. 3.5173 km WSW of Adak, AlaskaSun, Feb 14, 11:37 PM HAST · 2047 days ago · 10 km deep · 66 km away
36. 2.5193 km WSW of Adak, AlaskaWed, Feb 17, 8:35 PM HAST · 2044 days ago · 27 km deep · 46 km away
37. 3.8212 km WSW of Adak, AlaskaThu, Feb 18, 8:31 PM HAST · 2043 days ago · 31 km deep · 44 km away
38. 2.8224 km WSW of Adak, AlaskaThu, Feb 18, 8:39 PM HAST · 2043 days ago · 26 km deep · 48 km away
39. 4.2227 km SW of Adak, AlaskaThu, Feb 18, 11:08 PM HAST · 2043 days ago · 10 km deep · 66 km away
40. 5.6209 km WSW of Adak, AlaskaThu, Feb 18, 11:11 PM HAST · 2043 days ago · 19 km deep · 56 km away · tsunami flag
41. 4.6199 km WSW of Adak, AlaskaThu, Feb 18, 11:19 PM HAST · 2043 days ago · 35 km deep · 50 km away · felt by 1
42. 3.4216 km WSW of Adak, AlaskaThu, Feb 18, 11:28 PM HAST · 2043 days ago · 10 km deep · 63 km away
43. 3.0217 km SW of Adak, AlaskaFri, Feb 19, 12:11 AM HAST · 2043 days ago · 10 km deep · 66 km away
44. 2.2206 km WSW of Adak, AlaskaFri, Feb 19, 2:13 AM HAST · 2043 days ago · 7 km deep · 59 km away
45. 3.5213 km WSW of Adak, AlaskaFri, Feb 19, 2:18 AM HAST · 2043 days ago · 10 km deep · 64 km away
46. 3.5218 km WSW of Adak, AlaskaFri, Feb 19, 2:25 AM HAST · 2043 days ago · 10 km deep · 51 km away
47. 4.1236 km WSW of Adak, AlaskaFri, Feb 19, 2:29 AM HAST · 2043 days ago · 10 km deep · 46 km away
48. 3.8237 km WSW of Adak, AlaskaFri, Feb 19, 4:42 AM HAST · 2043 days ago · 23 km deep · 46 km away
49. 3.8228 km WSW of Adak, AlaskaFri, Feb 19, 11:34 AM HAST · 2043 days ago · 10 km deep · 57 km away
50. 3.0208 km WSW of Adak, AlaskaFri, Feb 19, 11:38 AM HAST · 2043 days ago · 16 km deep · 49 km away
51. 3.9180 km WSW of Adak, AlaskaFri, Feb 19, 1:03 PM HAST · 2043 days ago · 37 km deep · 65 km away
52. 2.1204 km WSW of Adak, AlaskaFri, Feb 19, 3:44 PM HAST · 2043 days ago · 8 km deep · 55 km away
53. 3.1234 km WSW of Adak, AlaskaFri, Feb 19, 5:50 PM HAST · 2043 days ago · 10 km deep · 40 km away
54. 4.0218 km WSW of Adak, AlaskaFri, Feb 19, 6:10 PM HAST · 2042 days ago · 10 km deep · 56 km away
55. 4.1211 km WSW of Adak, AlaskaFri, Feb 19, 6:14 PM HAST · 2042 days ago · 35 km deep · 47 km away
56. 1.8179 km WSW of Adak, AlaskaFri, Feb 19, 6:42 PM HAST · 2042 days ago · 13 km deep · 60 km away
57. 2.9213 km WSW of Adak, AlaskaSat, Feb 20, 12:22 AM HAST · 2042 days ago · 13 km deep · 51 km away
58. 4.8220 km WSW of Adak, AlaskaSun, Feb 21, 5:02 AM HAST · 2041 days ago · 10 km deep · 62 km away
59. 3.7225 km WSW of Adak, AlaskaSun, Feb 21, 1:05 PM HAST · 2041 days ago · 10 km deep · 57 km away
60. 3.1267 km W of Adak, AlaskaMon, Feb 22, 1:57 PM GMT+12 · 2041 days ago · 35 km deep · 49 km away

The first 60 of 72.

Before

1. 3.9242 km WSW of Adak, AlaskaSun, Jan 3, 1:13 AM GMT-12 · 2090 days ago · 35 km deep · 18 km away
2. 3.7251 km WSW of Adak, AlaskaSun, Jan 3, 12:56 AM GMT-12 · 2090 days ago · 10 km deep · 41 km away
3. 6.1230 km WSW of Adak, AlaskaSun, Jan 3, 2:38 AM HAST · 2090 days ago · 21 km deep · 8 km away · felt by 3 · tsunami flag
4. 4.1204 km WSW of Adak, AlaskaFri, Jan 1, 1:55 AM HAST · 2092 days ago · 35 km deep · 36 km away
5. 1.8183 km WSW of Adak, AlaskaWed, Dec 30, 5:14 PM HAST · 2094 days ago · 15 km deep · 68 km away
6. 2.5273 km SW of Adak, AlaskaWed, Dec 30, 2:22 PM GMT-12 · 2094 days ago · 27 km deep · 86 km away
7. 2.7239 km WSW of Adak, AlaskaTue, Dec 29, 10:09 AM GMT-12 · 2095 days ago · 35 km deep · 5 km away
8. 3.3288 km W of Adak, AlaskaMon, Dec 28, 10:23 AM GMT+12 · 2097 days ago · 35 km deep · 77 km away
9. 3.9191 km WSW of Adak, AlaskaFri, Dec 25, 2:25 AM HAST · 2099 days ago · 83 km deep · 45 km away
10. 3.0183 km WSW of Adak, AlaskaThu, Dec 24, 5:26 AM HAST · 2100 days ago · 35 km deep · 65 km away
11. 3.1253 km WSW of Adak, AlaskaThu, Dec 24, 10:29 AM GMT+12 · 2101 days ago · 10 km deep · 24 km away
12. 2.2148 km WSW of Adak, AlaskaWed, Dec 23, 1:14 AM HAST · 2101 days ago · 58 km deep · 89 km away
13. 1.9152 km WSW of Adak, AlaskaMon, Dec 21, 4:37 AM HAST · 2103 days ago · 11 km deep · 84 km away
14. 3.0254 km WSW of Adak, AlaskaMon, Dec 21, 7:56 PM GMT+12 · 2103 days ago · 12 km deep · 23 km away
15. 1.7156 km WSW of Adak, AlaskaSun, Dec 20, 7:42 PM HAST · 2103 days ago · 14 km deep · 81 km away
16. 2.5240 km WSW of Adak, AlaskaWed, Dec 16, 4:19 AM GMT+12 · 2109 days ago · 15 km deep · 21 km away
17. 3.8289 km WSW of Adak, AlaskaTue, Dec 15, 8:22 PM GMT+12 · 2109 days ago · 29 km deep · 54 km away
18. 2.7192 km WSW of Adak, AlaskaMon, Dec 14, 8:16 PM HAST · 2109 days ago · 28 km deep · 45 km away
19. 3.1241 km WSW of Adak, AlaskaSun, Dec 13, 3:50 PM GMT-12 · 2111 days ago · 35 km deep · 11 km away
20. 2.9191 km WSW of Adak, AlaskaSat, Dec 12, 10:33 PM HAST · 2111 days ago · 30 km deep · 63 km away

From the USGS Earthquake Hazards Program and its partner networks, event us6000d80x. Read Thu, Sep 24, 2026, 3:38 PM UTC.