Alaska earthquakes

M1.6 earthquake 258 km W of Adak, Alaska

A magnitude 1.6 earthquake struck 258 km W of Adak, Alaska on Fri, Feb 21, 2020, 4:17 AM GMT+12 (16:17 UTC), 12 km (8 mi) below the surface.

A larger quake followed: M5.7 239 km WSW 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
1.6 (ml), micro
Local time
UTC
2020-02-20 16:17:06 UTC
Depth
12.3 km (7.7 mi), shallow
Epicenter
51.937° N, 179.612° E
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

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 2.6 km horizontally, 1.5 km in depth
Magnitude uncertainty
±0.11
Depth from
From location
Station coverage gap
107°
Stations used
4

Nearby

Within 100 km, magnitude 1.5 and up: 78 in the 60 days after this one and 36 in the 30 days before it.

After

  1. 1.6258 km W of Adak, Alaska · 2414 days ago · 13 km deep · 2 km away
  2. 1.5258 km W of Adak, Alaska · 2414 days ago · 13 km deep · 2 km away
  3. 1.5257 km W of Adak, Alaska · 2414 days ago · 14 km deep · 4 km away
  4. 2.1207 km W of Adak, Alaska · 2413 days ago · 74 km deep · 69 km away
  5. 3.6Rat Islands, Aleutian Islands, Alaska · 2411 days ago · 157 km deep · 65 km away
  6. 2.1Rat Islands, Aleutian Islands, Alaska · 2410 days ago · -1 km deep · 91 km away
  7. 2.1244 km WSW of Adak, Alaska · 2410 days ago · 14 km deep · 94 km away
  8. 1.6261 km W of Adak, Alaska · 2410 days ago · 10 km deep · 5 km away
  9. 2.7244 km WSW of Adak, Alaska · 2409 days ago · 16 km deep · 96 km away
  10. 2.2211 km WSW of Adak, Alaska · 2408 days ago · 74 km deep · 69 km away
  11. 1.8Rat Islands, Aleutian Islands, Alaska · 2407 days ago · 8 km deep · 93 km away
  12. 1.8268 km W of Adak, Alaska · 2407 days ago · 16 km deep · 13 km away
  13. 2.5Rat Islands, Aleutian Islands, Alaska · 2407 days ago · 80 km deep · 65 km away
  14. 2.3Rat Islands, Aleutian Islands, Alaska · 2407 days ago · 4 km deep · 86 km away
  15. 3.7Rat Islands, Aleutian Islands, Alaska · 2406 days ago · 54 km deep · 61 km away
  16. 5.7239 km WSW of Adak, Alaska · 2404 days ago · 20 km deep · 100 km away · felt by 1 · tsunami flag
  17. 2.3239 km WSW of Adak, Alaska · 2404 days ago · 28 km deep · 83 km away
  18. 2.3263 km W of Adak, Alaska · 2404 days ago · 11 km deep · 49 km away
  19. 2.2237 km WSW of Adak, Alaska · 2404 days ago · 13 km deep · 89 km away
  20. 2.0237 km WSW of Adak, Alaska · 2404 days ago · 14 km deep · 91 km away
  21. 2.4237 km WSW of Adak, Alaska · 2403 days ago · 16 km deep · 89 km away
  22. 1.7Rat Islands, Aleutian Islands, Alaska · 2403 days ago · 2 km deep · 92 km away
  23. 2.6269 km W of Adak, Alaska · 2403 days ago · 165 km deep · 11 km away
  24. 1.5244 km WSW of Adak, Alaska · 2402 days ago · 16 km deep · 67 km away
  25. 2.6Rat Islands, Aleutian Islands, Alaska · 2402 days ago · 98 km deep · 65 km away
  26. 1.6Rat Islands, Aleutian Islands, Alaska · 2402 days ago · 25 km deep · 92 km away
  27. 3.5235 km WSW of Adak, Alaska · 2399 days ago · 57 km deep · 71 km away
  28. 2.9202 km WSW of Adak, Alaska · 2397 days ago · 10 km deep · 76 km away
  29. 2.7242 km WSW of Adak, Alaska · 2397 days ago · 35 km deep · 85 km away
  30. 3.8Rat Islands, Aleutian Islands, Alaska · 2395 days ago · 126 km deep · 94 km away
  31. 3.2201 km W of Adak, Alaska · 2394 days ago · 248 km deep · 57 km away
  32. 1.9205 km WSW of Adak, Alaska · 2394 days ago · 17 km deep · 86 km away
  33. 2.4235 km WSW of Adak, Alaska · 2393 days ago · 23 km deep · 79 km away
  34. 2.3255 km W of Adak, Alaska · 2391 days ago · 93 km deep · 27 km away
  35. 3.7270 km W of Adak, Alaska · 2389 days ago · 70 km deep · 43 km away
  36. 2.0Rat Islands, Aleutian Islands, Alaska · 2389 days ago · 10 km deep · 88 km away
  37. 2.8Rat Islands, Aleutian Islands, Alaska · 2389 days ago · 109 km deep · 71 km away
  38. 3.3Rat Islands, Aleutian Islands, Alaska · 2388 days ago · 54 km deep · 90 km away
  39. 1.7162 km W of Adak, Alaska · 2386 days ago · 8 km deep · 100 km away
  40. 1.9259 km W of Adak, Alaska · 2385 days ago · 94 km deep · 17 km away
  41. 2.2292 km W of Adak, Alaska · 2385 days ago · 71 km deep · 52 km away
  42. 2.9259 km WSW of Adak, Alaska · 2382 days ago · 52 km deep · 60 km away
  43. 1.6177 km W of Adak, Alaska · 2380 days ago · 67 km deep · 89 km away
  44. 1.8220 km W of Adak, Alaska · 2380 days ago · 83 km deep · 46 km away
  45. 2.2Rat Islands, Aleutian Islands, Alaska · 2379 days ago · 62 km deep · 84 km away
  46. 2.4Rat Islands, Aleutian Islands, Alaska · 2377 days ago · 5 km deep · 85 km away
  47. 2.0Andreanof Islands, Aleutian Islands, Alaska · 2377 days ago · 14 km deep · 95 km away
  48. 2.2226 km WSW of Adak, Alaska · 2377 days ago · 13 km deep · 77 km away
  49. 2.2234 km W of Adak, Alaska · 2375 days ago · 13 km deep · 35 km away
  50. 2.4235 km WSW of Adak, Alaska · 2375 days ago · 19 km deep · 79 km away
  51. 2.4253 km W of Adak, Alaska · 2374 days ago · 101 km deep · 18 km away
  52. 1.9271 km WSW of Adak, Alaska · 2373 days ago · 22 km deep · 62 km away
  53. 3.9Rat Islands, Aleutian Islands, Alaska · 2373 days ago · 85 km deep · 57 km away
  54. 2.0219 km W of Adak, Alaska · 2373 days ago · 98 km deep · 44 km away
  55. 1.8241 km WSW of Adak, Alaska · 2372 days ago · 14 km deep · 93 km away
  56. 3.8229 km WSW of Adak, Alaska · 2369 days ago · 14 km deep · 73 km away
  57. 2.9229 km WSW of Adak, Alaska · 2369 days ago · 22 km deep · 77 km away
  58. 2.1247 km W of Adak, Alaska · 2369 days ago · 80 km deep · 48 km away
  59. 4.2243 km WSW of Adak, Alaska · 2369 days ago · 55 km deep · 84 km away
  60. 1.5236 km WSW of Adak, Alaska · 2368 days ago · 56 km deep · 68 km away

The first 60 of 78.

Before

  1. 1.6264 km W of Adak, Alaska · 2414 days ago · 15 km deep · 8 km away
  2. 2.6226 km W of Adak, Alaska · 2415 days ago · 123 km deep · 32 km away
  3. 2.2Rat Islands, Aleutian Islands, Alaska · 2417 days ago · 69 km deep · 85 km away
  4. 2.6260 km WSW of Adak, Alaska · 2419 days ago · 64 km deep · 51 km away
  5. 2.2Rat Islands, Aleutian Islands, Alaska · 2420 days ago · 101 km deep · 84 km away
  6. 3.2271 km W of Adak, Alaska · 2423 days ago · 201 km deep · 21 km away
  7. 2.1165 km W of Adak, Alaska · 2425 days ago · 8 km deep · 96 km away
  8. 3.6274 km WSW of Adak, Alaska · 2425 days ago · 68 km deep · 55 km away
  9. 3.0236 km W of Adak, Alaska · 2426 days ago · 179 km deep · 22 km away
  10. 2.2253 km W of Adak, Alaska · 2428 days ago · 67 km deep · 41 km away
  11. 2.9240 km WSW of Adak, Alaska · 2428 days ago · 17 km deep · 88 km away
  12. 3.2Andreanof Islands, Aleutian Islands, Alaska · 2429 days ago · 14 km deep · 95 km away
  13. 3.1265 km WNW of Adak, Alaska · 2430 days ago · 167 km deep · 65 km away
  14. 4.9Rat Islands, Aleutian Islands, Alaska · 2430 days ago · 118 km deep · 84 km away
  15. 2.9239 km WSW of Adak, Alaska · 2431 days ago · 17 km deep · 91 km away
  16. 4.2229 km W of Adak, Alaska · 2431 days ago · 97 km deep · 36 km away
  17. 4.1272 km WSW of Adak, Alaska · 2432 days ago · 30 km deep · 93 km away
  18. 2.6204 km WSW of Adak, Alaska · 2434 days ago · 76 km deep · 74 km away
  19. 2.4226 km W of Adak, Alaska · 2436 days ago · 13 km deep · 37 km away
  20. 1.8Andreanof Islands, Aleutian Islands, Alaska · 2436 days ago · 13 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event av62137586. Read Wed, Sep 30, 2026, 10:58 PM UTC.