Alaska earthquakes

M3.9 earthquake 278 km W of Adak, Alaska

A magnitude 3.9 earthquake struck 278 km W of Adak, Alaska on Fri, Apr 17, 2020, 10:50 PM GMT+12 (10:50 UTC), 168 km (104 mi) below the surface.

A larger quake followed: M4.3 211 km W of Adak, Alaska. This one was a foreshock.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.9 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-04-17 10:50:54 UTC
Depth
167.7 km (104.2 mi), intermediate-depth
Epicenter
52.090° N, 179.323° E
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.ScaleComputed byNotes
3.9mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.051 · 101 stations
3.1ML, local (Richter)Alaska Earthquake CenterPreliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 9.6 km horizontally, 5.7 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
43°
Stations used
144

Nearby

Within 100 km, magnitude 1.5 and up: 85 in the 60 days after this one and 29 in the 30 days before it.

After

  1. 2.8Rat Islands, Aleutian Islands, Alaska · 2358 days ago · 81 km deep · 91 km away
  2. 2.2Rat Islands, Aleutian Islands, Alaska · 2357 days ago · 57 km deep · 77 km away
  3. 1.9263 km W of Adak, Alaska · 2357 days ago · 67 km deep · 64 km away
  4. 1.8Rat Islands, Aleutian Islands, Alaska · 2356 days ago · 83 km deep · 50 km away
  5. 3.9270 km W of Adak, Alaska · 2354 days ago · 111 km deep · 59 km away
  6. 3.1Rat Islands, Aleutian Islands, Alaska · 2353 days ago · 75 km deep · 87 km away
  7. 2.2Rat Islands, Aleutian Islands, Alaska · 2353 days ago · 69 km deep · 81 km away
  8. 3.0Rat Islands, Aleutian Islands, Alaska · 2352 days ago · 93 km deep · 54 km away
  9. 2.1Rat Islands, Aleutian Islands, Alaska · 2351 days ago · 83 km deep · 55 km away
  10. 1.9194 km W of Adak, Alaska · 2351 days ago · 87 km deep · 93 km away
  11. 4.1Rat Islands, Aleutian Islands, Alaska · 2350 days ago · 101 km deep · 69 km away
  12. 2.6229 km W of Adak, Alaska · 2350 days ago · 154 km deep · 50 km away
  13. 3.0253 km W of Adak, Alaska · 2349 days ago · 86 km deep · 60 km away
  14. 2.1280 km W of Adak, Alaska · 2348 days ago · 92 km deep · 30 km away
  15. 3.2Rat Islands, Aleutian Islands, Alaska · 2347 days ago · 128 km deep · 75 km away
  16. 1.7195 km W of Adak, Alaska · 2345 days ago · 13 km deep · 88 km away
  17. 2.6Rat Islands, Aleutian Islands, Alaska · 2345 days ago · 45 km deep · 89 km away
  18. 3.0229 km W of Adak, Alaska · 2343 days ago · 220 km deep · 49 km away
  19. 1.9206 km W of Adak, Alaska · 2343 days ago · 85 km deep · 85 km away
  20. 2.0231 km W of Adak, Alaska · 2343 days ago · 173 km deep · 54 km away
  21. 3.1292 km WSW of Adak, Alaska · 2342 days ago · 33 km deep · 85 km away
  22. 2.3291 km W of Adak, Alaska · 2341 days ago · 77 km deep · 39 km away
  23. 1.6290 km W of Adak, Alaska · 2341 days ago · 60 km deep · 66 km away
  24. 1.9251 km W of Adak, Alaska · 2340 days ago · 70 km deep · 63 km away
  25. 1.9284 km WSW of Adak, Alaska · 2340 days ago · 46 km deep · 84 km away
  26. 2.7Rat Islands, Aleutian Islands, Alaska · 2339 days ago · 35 km deep · 79 km away
  27. 2.6218 km W of Adak, Alaska · 2339 days ago · 76 km deep · 76 km away
  28. 1.9243 km WSW of Adak, Alaska · 2336 days ago · 61 km deep · 78 km away
  29. 2.6Rat Islands, Aleutian Islands, Alaska · 2335 days ago · 62 km deep · 79 km away
  30. 2.0295 km W of Adak, Alaska · 2335 days ago · 26 km deep · 70 km away
  31. 1.8263 km WSW of Adak, Alaska · 2335 days ago · 72 km deep · 72 km away
  32. 2.5248 km W of Adak, Alaska · 2335 days ago · 179 km deep · 30 km away
  33. 4.3211 km W of Adak, Alaska · 2335 days ago · 96 km deep · 78 km away
  34. 3.0Rat Islands, Aleutian Islands, Alaska · 2334 days ago · 54 km deep · 82 km away
  35. 2.9Rat Islands, Aleutian Islands, Alaska · 2332 days ago · 153 km deep · 87 km away
  36. 1.8229 km W of Adak, Alaska · 2332 days ago · 92 km deep · 66 km away
  37. 2.7241 km W of Adak, Alaska · 2331 days ago · 91 km deep · 60 km away
  38. 2.6Rat Islands, Aleutian Islands, Alaska · 2331 days ago · 63 km deep · 83 km away
  39. 3.2238 km WSW of Adak, Alaska · 2328 days ago · 68 km deep · 84 km away
  40. 2.3223 km W of Adak, Alaska · 2328 days ago · 84 km deep · 64 km away
  41. 3.9Rat Islands, Aleutian Islands, Alaska · 2328 days ago · 104 km deep · 73 km away
  42. 2.8298 km W of Adak, Alaska · 2327 days ago · 91 km deep · 35 km away
  43. 2.1Rat Islands, Aleutian Islands, Alaska · 2327 days ago · 103 km deep · 64 km away
  44. 2.2196 km W of Adak, Alaska · 2325 days ago · 69 km deep · 96 km away
  45. 2.8270 km WSW of Adak, Alaska · 2322 days ago · 58 km deep · 73 km away
  46. 2.6266 km WSW of Adak, Alaska · 2321 days ago · 69 km deep · 74 km away
  47. 2.0Rat Islands, Aleutian Islands, Alaska · 2321 days ago · 89 km deep · 43 km away
  48. 2.0Rat Islands, Aleutian Islands, Alaska · 2321 days ago · 55 km deep · 90 km away
  49. 2.2Rat Islands, Aleutian Islands, Alaska · 2320 days ago · 68 km deep · 79 km away
  50. 2.6Rat Islands, Aleutian Islands, Alaska · 2319 days ago · 2 km deep · 84 km away
  51. 1.6Rat Islands, Aleutian Islands, Alaska · 2319 days ago · 3 km deep · 74 km away
  52. 3.0Rat Islands, Aleutian Islands, Alaska · 2319 days ago · 10 km deep · 67 km away
  53. 2.1Rat Islands, Aleutian Islands, Alaska · 2319 days ago · -3 km deep · 82 km away
  54. 2.4210 km W of Adak, Alaska · 2318 days ago · 102 km deep · 81 km away
  55. 3.6Rat Islands, Aleutian Islands, Alaska · 2318 days ago · 123 km deep · 68 km away
  56. 2.2Rat Islands, Aleutian Islands, Alaska · 2318 days ago · 1 km deep · 72 km away
  57. 3.4Rat Islands, Aleutian Islands, Alaska · 2318 days ago · 116 km deep · 79 km away
  58. 1.5242 km W of Adak, Alaska · 2317 days ago · 27 km deep · 55 km away
  59. 1.6Rat Islands, Aleutian Islands, Alaska · 2317 days ago · 2 km deep · 63 km away
  60. 1.7Rat Islands, Aleutian Islands, Alaska · 2317 days ago · 1 km deep · 67 km away

The first 60 of 85.

Before

  1. 4.7251 km W of Adak, Alaska · 2359 days ago · 145 km deep · 33 km away
  2. 3.4252 km WSW of Adak, Alaska · 2359 days ago · 57 km deep · 84 km away
  3. 3.1268 km W of Adak, Alaska · 2360 days ago · 83 km deep · 53 km away
  4. 4.1Rat Islands, Aleutian Islands, Alaska · 2362 days ago · 127 km deep · 73 km away
  5. 2.3247 km W of Adak, Alaska · 2362 days ago · 66 km deep · 72 km away
  6. 2.0Rat Islands, Aleutian Islands, Alaska · 2363 days ago · 6 km deep · 71 km away
  7. 1.6Rat Islands, Aleutian Islands, Alaska · 2364 days ago · 25 km deep · 75 km away
  8. 3.9223 km WSW of Adak, Alaska · 2365 days ago · 72 km deep · 90 km away
  9. 2.8Rat Islands, Aleutian Islands, Alaska · 2368 days ago · 21 km deep · 72 km away
  10. 2.7Rat Islands, Aleutian Islands, Alaska · 2369 days ago · 16 km deep · 74 km away
  11. 2.2222 km W of Adak, Alaska · 2369 days ago · 93 km deep · 67 km away
  12. 2.2253 km WSW of Adak, Alaska · 2369 days ago · 55 km deep · 80 km away
  13. 1.5236 km WSW of Adak, Alaska · 2369 days ago · 56 km deep · 93 km away
  14. 2.1247 km W of Adak, Alaska · 2370 days ago · 80 km deep · 72 km away
  15. 3.8229 km WSW of Adak, Alaska · 2371 days ago · 14 km deep · 98 km away
  16. 2.0219 km W of Adak, Alaska · 2374 days ago · 98 km deep · 69 km away
  17. 3.9Rat Islands, Aleutian Islands, Alaska · 2374 days ago · 85 km deep · 58 km away
  18. 1.9271 km WSW of Adak, Alaska · 2375 days ago · 22 km deep · 80 km away
  19. 2.4253 km W of Adak, Alaska · 2375 days ago · 101 km deep · 43 km away
  20. 2.2234 km W of Adak, Alaska · 2377 days ago · 13 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008yey (also filed as ak0204ysan53). Read Fri, Oct 2, 2026, 1:53 PM UTC.