Alaska earthquakes

M2.5 earthquake 135 km W of Adak, Alaska

A magnitude 2.5 earthquake struck 135 km W of Adak, Alaska on Fri, Mar 20, 2020, 9:03 AM HADT (18:03 UTC), 211 km (131 mi) below the surface.

A larger quake followed: M5.0 71 km WNW 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
2.5 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2020-03-20 18:03:43 UTC
Depth
211.3 km (131.3 mi), intermediate-depth
Epicenter
51.988° N, 178.597° W
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
2.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.128 · 8 stations
2.4ML, 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 14.0 km horizontally, 4.6 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
110°
Stations used
34

Nearby

Within 100 km, magnitude 1.5 and up: 132 in the 60 days after this one and 97 in the 30 days before it.

After

  1. 1.5128 km WSW of Adak, Alaska · 2387 days ago · 13 km deep · 39 km away
  2. 2.791 km SW of Adak, Alaska · 2386 days ago · 62 km deep · 92 km away
  3. 5.071 km WNW of Adak, Alaska · 2384 days ago · 101 km deep · 68 km away
  4. 2.366 km W of Adak, Alaska · 2384 days ago · 93 km deep · 71 km away
  5. 1.842 km W of Adak, Alaska · 2384 days ago · 69 km deep · 94 km away
  6. 1.8131 km WSW of Adak, Alaska · 2384 days ago · 27 km deep · 85 km away
  7. 2.5136 km W of Adak, Alaska · 2384 days ago · 138 km deep · 17 km away
  8. 1.7114 km WSW of Adak, Alaska · 2384 days ago · 13 km deep · 68 km away
  9. 1.866 km W of Adak, Alaska · 2384 days ago · 90 km deep · 70 km away
  10. 1.7149 km WSW of Adak, Alaska · 2384 days ago · 18 km deep · 57 km away
  11. 1.7149 km WSW of Adak, Alaska · 2384 days ago · 11 km deep · 61 km away
  12. 2.0136 km WSW of Adak, Alaska · 2383 days ago · 5 km deep · 47 km away
  13. 1.898 km WSW of Adak, AK · 2383 days ago · 31 km deep · 79 km away
  14. 1.678 km W of Adak, Alaska · 2382 days ago · 7 km deep · 60 km away
  15. 1.6177 km W of Adak, Alaska · 2382 days ago · 67 km deep · 55 km away
  16. 1.8220 km W of Adak, Alaska · 2382 days ago · 83 km deep · 89 km away
  17. 1.6147 km WSW of Adak, Alaska · 2381 days ago · 4 km deep · 58 km away
  18. 1.772 km SW of Adak, Alaska · 2381 days ago · 36 km deep · 95 km away
  19. 1.579 km W of Adak, Alaska · 2381 days ago · 7 km deep · 59 km away
  20. 1.7131 km SW of Adak, Alaska · 2381 days ago · 36 km deep · 91 km away
  21. 1.8171 km WSW of Adak, Alaska · 2381 days ago · 20 km deep · 94 km away
  22. 1.9120 km WSW of Adak, Alaska · 2381 days ago · 10 km deep · 65 km away
  23. 1.6112 km WSW of Adak, Alaska · 2381 days ago · 51 km deep · 82 km away
  24. 2.9102 km WSW of Adak, Alaska · 2380 days ago · 69 km deep · 66 km away
  25. 1.673 km SW of Adak, Alaska · 2380 days ago · 34 km deep · 94 km away
  26. 3.5116 km WSW of Adak, AK · 2379 days ago · 58 km deep · 84 km away
  27. 2.799 km W of Adak, Alaska · 2379 days ago · 197 km deep · 41 km away
  28. 2.0148 km WSW of Adak, Alaska · 2378 days ago · 13 km deep · 65 km away
  29. 2.6111 km WSW of Adak, Alaska · 2378 days ago · 40 km deep · 80 km away
  30. 2.0131 km WSW of Adak, Alaska · 2377 days ago · 25 km deep · 68 km away
  31. 1.681 km W of Adak, Alaska · 2377 days ago · 7 km deep · 55 km away
  32. 1.579 km WSW of Adak, Alaska · 2377 days ago · 26 km deep · 88 km away
  33. 1.681 km W of Adak, Alaska · 2376 days ago · 7 km deep · 55 km away
  34. 4.8138 km WSW of Adak, Alaska · 2375 days ago · 35 km deep · 86 km away
  35. 1.6131 km WSW of Adak, Alaska · 2375 days ago · 29 km deep · 86 km away
  36. 1.576 km W of Adak, Alaska · 2375 days ago · 7 km deep · 61 km away
  37. 1.739 km W of Adak, Alaska · 2375 days ago · 92 km deep · 97 km away
  38. 2.075 km W of Adak, Alaska · 2375 days ago · 6 km deep · 62 km away
  39. 3.5132 km WSW of Adak, Alaska · 2375 days ago · 32 km deep · 88 km away
  40. 2.0219 km W of Adak, Alaska · 2375 days ago · 98 km deep · 86 km away
  41. 1.8176 km WSW of Adak, Alaska · 2374 days ago · 14 km deep · 72 km away
  42. 1.796 km WSW of Adak, Alaska · 2374 days ago · 21 km deep · 76 km away
  43. 2.0134 km WSW of Adak, Alaska · 2374 days ago · 7 km deep · 39 km away
  44. 3.544 km W of Adak, Alaska · 2374 days ago · 101 km deep · 92 km away
  45. 1.962 km WSW of Adak, Alaska · 2374 days ago · 13 km deep · 84 km away
  46. 2.7127 km WSW of Adak, Alaska · 2373 days ago · 28 km deep · 85 km away
  47. 2.260 km WSW of Adak, Alaska · 2373 days ago · 14 km deep · 96 km away
  48. 1.981 km W of Adak, Alaska · 2372 days ago · 3 km deep · 55 km away
  49. 3.5Andreanof Islands, Aleutian Islands, Alaska · 2371 days ago · 77 km deep · 98 km away
  50. 1.982 km W of Adak, Alaska · 2371 days ago · 5 km deep · 54 km away
  51. 2.782 km W of Adak, Alaska · 2371 days ago · 8 km deep · 58 km away
  52. 1.882 km W of Adak, Alaska · 2371 days ago · 5 km deep · 55 km away
  53. 1.682 km W of Adak, Alaska · 2371 days ago · 5 km deep · 56 km away
  54. 1.879 km W of Adak, Alaska · 2370 days ago · 0 km deep · 58 km away
  55. 1.8159 km W of Adak, Alaska · 2370 days ago · 8 km deep · 36 km away
  56. 1.685 km W of Adak, Alaska · 2370 days ago · 7 km deep · 52 km away
  57. 2.2222 km W of Adak, Alaska · 2369 days ago · 93 km deep · 91 km away
  58. 3.6133 km WSW of Adak, Alaska · 2368 days ago · 33 km deep · 70 km away
  59. 1.7106 km WSW of Adak, Alaska · 2368 days ago · 14 km deep · 58 km away
  60. 1.767 km SW of Adak, Alaska · 2367 days ago · 54 km deep · 100 km away

The first 60 of 132.

Before

  1. 2.0144 km WSW of Adak, Alaska · 2387 days ago · 24 km deep · 85 km away
  2. 1.9135 km WSW of Adak, Alaska · 2387 days ago · 7 km deep · 40 km away
  3. 1.7162 km W of Adak, Alaska · 2388 days ago · 8 km deep · 39 km away
  4. 3.3123 km WSW of Adak, Alaska · 2389 days ago · 28 km deep · 77 km away
  5. 1.662 km W of Adak, Alaska · 2390 days ago · 7 km deep · 76 km away
  6. 1.6123 km WSW of Adak, Alaska · 2390 days ago · 26 km deep · 78 km away
  7. 2.0125 km WSW of Adak, Alaska · 2391 days ago · 8 km deep · 47 km away
  8. 3.0115 km WSW of Adak, Alaska · 2392 days ago · 28 km deep · 75 km away
  9. 2.3127 km WSW of Adak, Alaska · 2393 days ago · 24 km deep · 80 km away
  10. 1.765 km WSW of Adak, Alaska · 2394 days ago · 60 km deep · 85 km away
  11. 1.680 km W of Adak, Alaska · 2394 days ago · 5 km deep · 57 km away
  12. 1.779 km W of Adak, Alaska · 2394 days ago · 5 km deep · 59 km away
  13. 1.6Andreanof Islands, Aleutian Islands, Alaska · 2395 days ago · 8 km deep · 54 km away
  14. 2.1188 km WSW of Adak, Alaska · 2395 days ago · 24 km deep · 85 km away
  15. 2.775 km SW of Adak, Alaska · 2395 days ago · 48 km deep · 94 km away
  16. 1.9205 km WSW of Adak, Alaska · 2395 days ago · 17 km deep · 91 km away
  17. 2.0187 km WSW of Adak, Alaska · 2396 days ago · 24 km deep · 87 km away
  18. 3.2201 km W of Adak, Alaska · 2396 days ago · 248 km deep · 66 km away
  19. 1.8Andreanof Islands, Aleutian Islands, Alaska · 2396 days ago · 9 km deep · 59 km away
  20. 1.778 km W of Adak, Alaska · 2396 days ago · 4 km deep · 59 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70008iq9 (also filed as ak0203olqb2s). Read Fri, Oct 2, 2026, 7:25 PM UTC.