Alaska earthquakes

M1.5 earthquake 258 km W of Adak, Alaska

A magnitude 1.5 earthquake struck 258 km W of Adak, Alaska on Fri, Feb 21, 2020, 8:03 AM GMT+12 (20:03 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M4.7 251 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
1.5 (ML, local (Richter)), micro
Magnitude from
AV
Local time
UTC
2020-02-20 20:03:21 UTC
Depth
13.0 km (8.1 mi), shallow
Epicenter
51.953° N, 179.615° 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 2.9 km horizontally, 1.7 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
138°
Stations used
4

Nearby

Within 100 km, magnitude 1.5 and up: 75 in the 60 days after this one and 37 in the 30 days before it.

After

  1. 1.5257 km W of Adak, Alaska · 2415 days ago · 14 km deep · 6 km away
  2. 2.1207 km W of Adak, Alaska · 2414 days ago · 74 km deep · 70 km away
  3. 3.6Rat Islands, Aleutian Islands, Alaska · 2412 days ago · 157 km deep · 65 km away
  4. 2.1Rat Islands, Aleutian Islands, Alaska · 2412 days ago · -1 km deep · 91 km away
  5. 2.1244 km WSW of Adak, Alaska · 2411 days ago · 14 km deep · 95 km away
  6. 1.6261 km W of Adak, Alaska · 2411 days ago · 10 km deep · 7 km away
  7. 2.7244 km WSW of Adak, Alaska · 2410 days ago · 16 km deep · 97 km away
  8. 2.2211 km WSW of Adak, Alaska · 2409 days ago · 74 km deep · 70 km away
  9. 1.8Rat Islands, Aleutian Islands, Alaska · 2409 days ago · 8 km deep · 93 km away
  10. 1.8268 km W of Adak, Alaska · 2408 days ago · 16 km deep · 14 km away
  11. 2.5Rat Islands, Aleutian Islands, Alaska · 2408 days ago · 80 km deep · 66 km away
  12. 2.3Rat Islands, Aleutian Islands, Alaska · 2408 days ago · 4 km deep · 86 km away
  13. 3.7Rat Islands, Aleutian Islands, Alaska · 2407 days ago · 54 km deep · 62 km away
  14. 2.3239 km WSW of Adak, Alaska · 2405 days ago · 28 km deep · 85 km away
  15. 2.3263 km W of Adak, Alaska · 2405 days ago · 11 km deep · 51 km away
  16. 2.2237 km WSW of Adak, Alaska · 2405 days ago · 13 km deep · 91 km away
  17. 2.0237 km WSW of Adak, Alaska · 2405 days ago · 14 km deep · 93 km away
  18. 2.4237 km WSW of Adak, Alaska · 2405 days ago · 16 km deep · 90 km away
  19. 1.7Rat Islands, Aleutian Islands, Alaska · 2404 days ago · 2 km deep · 93 km away
  20. 2.6269 km W of Adak, Alaska · 2404 days ago · 165 km deep · 12 km away
  21. 1.5244 km WSW of Adak, Alaska · 2403 days ago · 16 km deep · 69 km away
  22. 2.6Rat Islands, Aleutian Islands, Alaska · 2403 days ago · 98 km deep · 66 km away
  23. 1.6Rat Islands, Aleutian Islands, Alaska · 2403 days ago · 25 km deep · 94 km away
  24. 3.5235 km WSW of Adak, Alaska · 2400 days ago · 57 km deep · 72 km away
  25. 2.9202 km WSW of Adak, Alaska · 2399 days ago · 10 km deep · 77 km away
  26. 2.7242 km WSW of Adak, Alaska · 2398 days ago · 35 km deep · 86 km away
  27. 3.8Rat Islands, Aleutian Islands, Alaska · 2397 days ago · 126 km deep · 94 km away
  28. 3.2201 km W of Adak, Alaska · 2395 days ago · 248 km deep · 57 km away
  29. 1.9205 km WSW of Adak, Alaska · 2395 days ago · 17 km deep · 87 km away
  30. 2.4235 km WSW of Adak, Alaska · 2394 days ago · 23 km deep · 80 km away
  31. 2.3255 km W of Adak, Alaska · 2393 days ago · 93 km deep · 28 km away
  32. 3.7270 km W of Adak, Alaska · 2391 days ago · 70 km deep · 45 km away
  33. 2.0Rat Islands, Aleutian Islands, Alaska · 2391 days ago · 10 km deep · 88 km away
  34. 2.8Rat Islands, Aleutian Islands, Alaska · 2390 days ago · 109 km deep · 72 km away
  35. 3.3Rat Islands, Aleutian Islands, Alaska · 2389 days ago · 54 km deep · 91 km away
  36. 1.7162 km W of Adak, Alaska · 2387 days ago · 8 km deep · 100 km away
  37. 1.9259 km W of Adak, Alaska · 2386 days ago · 94 km deep · 19 km away
  38. 2.2292 km W of Adak, Alaska · 2386 days ago · 71 km deep · 53 km away
  39. 2.9259 km WSW of Adak, Alaska · 2383 days ago · 52 km deep · 62 km away
  40. 1.6177 km W of Adak, Alaska · 2381 days ago · 67 km deep · 89 km away
  41. 1.8220 km W of Adak, Alaska · 2381 days ago · 83 km deep · 47 km away
  42. 2.2Rat Islands, Aleutian Islands, Alaska · 2380 days ago · 62 km deep · 85 km away
  43. 2.4Rat Islands, Aleutian Islands, Alaska · 2379 days ago · 5 km deep · 85 km away
  44. 2.0Andreanof Islands, Aleutian Islands, Alaska · 2378 days ago · 14 km deep · 96 km away
  45. 2.2226 km WSW of Adak, Alaska · 2378 days ago · 13 km deep · 79 km away
  46. 2.2234 km W of Adak, Alaska · 2377 days ago · 13 km deep · 36 km away
  47. 2.4235 km WSW of Adak, Alaska · 2377 days ago · 19 km deep · 80 km away
  48. 2.4253 km W of Adak, Alaska · 2375 days ago · 101 km deep · 20 km away
  49. 1.9271 km WSW of Adak, Alaska · 2374 days ago · 22 km deep · 64 km away
  50. 3.9Rat Islands, Aleutian Islands, Alaska · 2374 days ago · 85 km deep · 58 km away
  51. 2.0219 km W of Adak, Alaska · 2374 days ago · 98 km deep · 44 km away
  52. 1.8241 km WSW of Adak, Alaska · 2374 days ago · 14 km deep · 95 km away
  53. 3.8229 km WSW of Adak, Alaska · 2371 days ago · 14 km deep · 74 km away
  54. 2.9229 km WSW of Adak, Alaska · 2371 days ago · 22 km deep · 78 km away
  55. 2.1247 km W of Adak, Alaska · 2370 days ago · 80 km deep · 50 km away
  56. 4.2243 km WSW of Adak, Alaska · 2370 days ago · 55 km deep · 86 km away
  57. 1.5236 km WSW of Adak, Alaska · 2369 days ago · 56 km deep · 70 km away
  58. 2.2253 km WSW of Adak, Alaska · 2369 days ago · 55 km deep · 60 km away
  59. 2.2222 km W of Adak, Alaska · 2369 days ago · 93 km deep · 42 km away
  60. 2.7Rat Islands, Aleutian Islands, Alaska · 2368 days ago · 16 km deep · 91 km away

The first 60 of 75.

Before

  1. 1.6258 km W of Adak, Alaska · 2416 days ago · 13 km deep · 4 km away
  2. 1.6258 km W of Adak, Alaska · 2416 days ago · 12 km deep · 2 km away
  3. 1.6264 km W of Adak, Alaska · 2416 days ago · 15 km deep · 10 km away
  4. 2.6226 km W of Adak, Alaska · 2416 days ago · 123 km deep · 33 km away
  5. 2.2Rat Islands, Aleutian Islands, Alaska · 2418 days ago · 69 km deep · 85 km away
  6. 2.6260 km WSW of Adak, Alaska · 2420 days ago · 64 km deep · 53 km away
  7. 2.2Rat Islands, Aleutian Islands, Alaska · 2422 days ago · 101 km deep · 85 km away
  8. 3.2271 km W of Adak, Alaska · 2424 days ago · 201 km deep · 19 km away
  9. 2.1165 km W of Adak, Alaska · 2427 days ago · 8 km deep · 96 km away
  10. 3.6274 km WSW of Adak, Alaska · 2427 days ago · 68 km deep · 56 km away
  11. 3.0236 km W of Adak, Alaska · 2427 days ago · 179 km deep · 22 km away
  12. 2.2253 km W of Adak, Alaska · 2429 days ago · 67 km deep · 43 km away
  13. 2.9240 km WSW of Adak, Alaska · 2429 days ago · 17 km deep · 90 km away
  14. 3.2Andreanof Islands, Aleutian Islands, Alaska · 2430 days ago · 14 km deep · 96 km away
  15. 3.1265 km WNW of Adak, Alaska · 2431 days ago · 167 km deep · 64 km away
  16. 4.9Rat Islands, Aleutian Islands, Alaska · 2431 days ago · 118 km deep · 84 km away
  17. 2.9239 km WSW of Adak, Alaska · 2432 days ago · 17 km deep · 92 km away
  18. 4.2229 km W of Adak, Alaska · 2432 days ago · 97 km deep · 37 km away
  19. 4.1272 km WSW of Adak, Alaska · 2433 days ago · 30 km deep · 95 km away
  20. 2.6204 km WSW of Adak, Alaska · 2435 days ago · 76 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event av62137651. Read Fri, Oct 2, 2026, 6:11 AM UTC.