M4.9 earthquake 170 km WSW of Adak, Alaska

Magnitude

4.9 (mb), light

Local time

Wed, Jul 22, 2020, 2:06 PM HADT

UTC

2020-07-22 23:06:36 UTC

Depth

45.0 km (28.0 mi), shallow

Epicenter

51.348° N, 178.942° W

Region

Alaska

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 8.4 km horizontally, 5.0 km in depth

Magnitude uncertainty

±0.04

Depth from

From location

Station coverage gap

81°

Stations used

301

After

1. 1.9239 km WSW of Adak, AlaskaWed, Jul 22, 1:07 PM GMT-12 · 2259 days ago · 13 km deep · 70 km away
2. 2.4123 km SW of Adak, AlaskaWed, Jul 22, 9:55 PM HADT · 2259 days ago · 16 km deep · 69 km away
3. 2.1141 km WSW of Adak, AlaskaThu, Jul 23, 5:18 AM HADT · 2258 days ago · 26 km deep · 35 km away
4. 2.9184 km W of Adak, AlaskaThu, Jul 23, 3:40 PM HADT · 2258 days ago · 176 km deep · 60 km away
5. 1.976 km W of Adak, AlaskaFri, Jul 24, 10:33 AM HADT · 2257 days ago · 103 km deep · 99 km away
6. 2.1174 km WSW of Adak, AlaskaFri, Jul 24, 12:51 PM HADT · 2257 days ago · 24 km deep · 18 km away
7. 1.981 km WSW of Adak, AlaskaSat, Jul 25, 3:24 AM HADT · 2257 days ago · 65 km deep · 89 km away
8. 3.7182 km WSW of Adak, AlaskaSat, Jul 25, 1:22 PM HADT · 2256 days ago · 21 km deep · 29 km away
9. 1.9Rat Islands, Aleutian Islands, AlaskaMon, Jul 27, 12:13 PM GMT+12 · 2255 days ago · 100 km deep · 99 km away
10. 1.9124 km W of Adak, AlaskaTue, Jul 28, 1:55 PM HADT · 2253 days ago · 186 km deep · 80 km away
11. 2.0147 km WSW of Adak, AlaskaTue, Jul 28, 5:19 PM HADT · 2253 days ago · 26 km deep · 36 km away
12. 1.9153 km WSW of Adak, AlaskaWed, Jul 29, 4:49 AM HADT · 2252 days ago · 53 km deep · 19 km away
13. 1.9248 km W of Adak, AlaskaFri, Jul 31, 9:57 PM GMT+12 · 2251 days ago · 76 km deep · 90 km away
14. 2.6124 km SW of Adak, AlaskaSat, Aug 1, 9:19 AM HADT · 2249 days ago · 35 km deep · 69 km away
15. 2.1217 km WSW of Adak, AlaskaSat, Aug 1, 10:20 AM HADT · 2249 days ago · 10 km deep · 51 km away
16. 2.8181 km WSW of Adak, AlaskaSat, Aug 1, 10:34 AM HADT · 2249 days ago · 30 km deep · 26 km away
17. 3.9151 km WSW of Adak, AlaskaSun, Aug 2, 4:58 AM HADT · 2248 days ago · 35 km deep · 39 km away
18. 3.6139 km WSW of Adak, AlaskaMon, Aug 3, 3:19 AM HADT · 2248 days ago · 29 km deep · 44 km away
19. 2.584 km SW of Adak, AlaskaMon, Aug 3, 10:21 AM HADT · 2247 days ago · 36 km deep · 94 km away
20. 2.6260 km WSW of Adak, AlaskaTue, Aug 4, 11:58 AM GMT-12 · 2246 days ago · 10 km deep · 92 km away
21. 2.7125 km WSW of Adak, AlaskaWed, Aug 5, 3:45 AM HADT · 2246 days ago · 35 km deep · 54 km away
22. 3.2192 km W of Adak, AlaskaThu, Aug 6, 3:29 AM HADT · 2245 days ago · 179 km deep · 84 km away
23. 2.5215 km W of Adak, AlaskaThu, Aug 6, 5:02 PM HADT · 2244 days ago · 126 km deep · 79 km away
24. 2.6220 km WSW of Adak, AlaskaFri, Aug 7, 2:03 PM HADT · 2243 days ago · 16 km deep · 52 km away
25. 1.9129 km WSW of Adak, AlaskaSun, Aug 9, 4:27 PM HADT · 2241 days ago · 7 km deep · 45 km away
26. 3.8128 km SW of Adak, AlaskaSun, Aug 9, 5:42 PM HADT · 2241 days ago · 26 km deep · 55 km away
27. 1.9131 km SW of Adak, AlaskaSun, Aug 9, 6:01 PM HADT · 2241 days ago · 45 km deep · 59 km away
28. 3.2191 km WSW of Adak, AlaskaMon, Aug 10, 5:07 AM HADT · 2240 days ago · 18 km deep · 38 km away
29. 2.2185 km WSW of Adak, AlaskaMon, Aug 10, 6:35 AM HADT · 2240 days ago · 22 km deep · 26 km away
30. 2.0140 km SW of Adak, AlaskaMon, Aug 10, 11:14 AM HADT · 2240 days ago · 14 km deep · 58 km away
31. 1.9142 km SW of Adak, AlaskaMon, Aug 10, 11:27 AM HADT · 2240 days ago · 20 km deep · 56 km away
32. 1.979 km WSW of Adak, AlaskaMon, Aug 10, 11:38 AM HADT · 2240 days ago · 21 km deep · 93 km away
33. 2.0182 km W of Adak, AlaskaTue, Aug 11, 1:57 AM HADT · 2240 days ago · 83 km deep · 58 km away
34. 2.0246 km WSW of Adak, AlaskaThu, Aug 13, 1:30 PM GMT+12 · 2238 days ago · 18 km deep · 79 km away
35. 2.2214 km WSW of Adak, AlaskaWed, Aug 12, 5:43 PM HADT · 2238 days ago · 17 km deep · 44 km away
36. 3.2130 km WSW of Adak, AlaskaThu, Aug 13, 3:30 PM HADT · 2237 days ago · 88 km deep · 44 km away
37. 2.7131 km WSW of Adak, AlaskaThu, Aug 13, 11:40 PM HADT · 2237 days ago · 10 km deep · 38 km away
38. 2.9158 km WSW of Adak, AlaskaSun, Aug 16, 2:46 AM HADT · 2235 days ago · 29 km deep · 39 km away
39. 3.3128 km WSW of Adak, AlaskaSun, Aug 16, 11:58 AM HADT · 2234 days ago · 10 km deep · 42 km away
40. 1.9221 km W of Adak, AlaskaSun, Aug 16, 12:07 PM HADT · 2234 days ago · 72 km deep · 67 km away
41. 3.8133 km W of Adak, AlaskaSun, Aug 16, 10:22 PM HADT · 2234 days ago · 145 km deep · 71 km away
42. 2.1145 km WSW of Adak, AlaskaMon, Aug 17, 1:33 PM HADT · 2233 days ago · 64 km deep · 27 km away
43. 1.9130 km WSW of Adak, AlaskaTue, Aug 18, 1:27 AM HADT · 2233 days ago · 10 km deep · 41 km away
44. 2.8226 km WSW of Adak, AlaskaTue, Aug 18, 6:49 PM HADT · 2232 days ago · 67 km deep · 66 km away
45. 2.7163 km SW of Adak, AlaskaTue, Aug 18, 11:58 PM HADT · 2232 days ago · 10 km deep · 50 km away
46. 2.0178 km W of Adak, AlaskaThu, Aug 20, 10:52 PM HADT · 2230 days ago · 158 km deep · 61 km away
47. 1.9245 km WSW of Adak, AlaskaSun, Aug 23, 1:08 AM GMT+12 · 2228 days ago · 26 km deep · 77 km away
48. 2.8245 km W of Adak, AlaskaSun, Aug 23, 4:43 AM GMT+12 · 2228 days ago · 72 km deep · 87 km away
49. 2.1145 km WSW of Adak, AlaskaSat, Aug 22, 2:29 PM HADT · 2228 days ago · 23 km deep · 38 km away
50. 1.992 km W of Adak, AlaskaSun, Aug 23, 9:27 PM HADT · 2227 days ago · 2 km deep · 87 km away
51. 1.9249 km W of Adak, AlaskaTue, Aug 25, 12:32 AM GMT+12 · 2227 days ago · 60 km deep · 89 km away
52. 3.8211 km WSW of Adak, AlaskaTue, Aug 25, 12:55 AM HADT · 2226 days ago · 15 km deep · 46 km away
53. 2.7161 km WSW of Adak, AlaskaTue, Aug 25, 3:13 AM HADT · 2226 days ago · 28 km deep · 35 km away
54. 2.0182 km WSW of Adak, AlaskaWed, Aug 26, 2:31 AM HADT · 2225 days ago · 23 km deep · 15 km away
55. 2.2229 km W of Adak, AlaskaWed, Aug 26, 5:44 PM HADT · 2224 days ago · 94 km deep · 87 km away
56. 3.6Andreanof Islands, Aleutian Islands, AlaskaFri, Aug 28, 3:19 PM HADT · 2222 days ago · 35 km deep · 82 km away
57. 2.0222 km W of Adak, AlaskaFri, Aug 28, 10:38 PM HADT · 2222 days ago · 77 km deep · 71 km away
58. 4.3126 km WSW of Adak, AlaskaSun, Aug 30, 2:20 AM HADT · 2221 days ago · 34 km deep · 43 km away
59. 1.9135 km WSW of Adak, AlaskaMon, Aug 31, 8:46 AM HADT · 2219 days ago · 26 km deep · 36 km away
60. 3.2149 km SW of Adak, AlaskaMon, Aug 31, 12:10 PM HADT · 2219 days ago · 30 km deep · 47 km away

The first 60 of 100.

Before

1. 1.9149 km WSW of Adak, AlaskaTue, Jul 21, 1:08 PM HADT · 2260 days ago · 4 km deep · 21 km away
2. 1.9126 km WSW of Adak, AlaskaTue, Jul 21, 3:18 AM HADT · 2261 days ago · 74 km deep · 47 km away
3. 2.7244 km WSW of Adak, AlaskaSun, Jul 19, 3:39 PM GMT-12 · 2262 days ago · 17 km deep · 75 km away
4. 3.0189 km WSW of Adak, AlaskaThu, Jul 16, 12:21 PM HADT · 2265 days ago · 33 km deep · 25 km away
5. 2.2226 km W of Adak, AlaskaThu, Jul 16, 10:17 AM HADT · 2265 days ago · 101 km deep · 83 km away
6. 2.6217 km W of Adak, AlaskaTue, Jul 14, 4:32 PM HADT · 2267 days ago · 92 km deep · 67 km away
7. 3.1210 km W of Adak, AlaskaTue, Jul 14, 1:16 PM HADT · 2267 days ago · 205 km deep · 79 km away
8. 2.2207 km W of Adak, AlaskaSun, Jul 12, 3:41 PM HADT · 2269 days ago · 90 km deep · 62 km away
9. 3.4124 km SW of Adak, AlaskaThu, Jul 9, 6:13 AM HADT · 2272 days ago · 30 km deep · 60 km away
10. 2.077 km W of Adak, AlaskaWed, Jul 8, 8:55 PM HADT · 2273 days ago · 9 km deep · 98 km away
11. 2.6213 km W of Adak, AlaskaWed, Jul 8, 4:15 PM HADT · 2273 days ago · 121 km deep · 70 km away
12. 2.177 km WSW of Adak, AlaskaTue, Jul 7, 10:48 PM HADT · 2274 days ago · 186 km deep · 94 km away
13. 2.8129 km WSW of Adak, AlaskaTue, Jul 7, 3:11 PM HADT · 2274 days ago · 10 km deep · 42 km away
14. 1.9181 km W of Adak, AlaskaMon, Jul 6, 3:01 AM HADT · 2276 days ago · 74 km deep · 35 km away
15. 3.0177 km WSW of Adak, AlaskaSun, Jul 5, 3:10 PM HADT · 2276 days ago · 10 km deep · 8 km away
16. 1.978 km W of Adak, AlaskaSun, Jul 5, 1:50 AM HADT · 2277 days ago · 5 km deep · 96 km away
17. 2.9238 km WSW of Adak, AlaskaSat, Jul 4, 7:43 AM GMT-12 · 2277 days ago · 14 km deep · 69 km away
18. 4.0122 km WSW of Adak, AlaskaSat, Jul 4, 6:55 AM HADT · 2277 days ago · 45 km deep · 56 km away
19. 1.9237 km WSW of Adak, AlaskaSat, Jul 4, 6:43 AM HADT · 2277 days ago · 13 km deep · 68 km away
20. 2.8122 km WSW of Adak, AlaskaFri, Jul 3, 1:09 PM HADT · 2278 days ago · 10 km deep · 48 km away

From the USGS Earthquake Hazards Program and its partner networks, event us6000b2b3. Read Tue, Sep 29, 2026, 12:37 AM UTC.