Alaska earthquakes

M4.0 earthquake 75 km ESE of Adak, AK

A magnitude 4.0 earthquake struck 75 km ESE of Adak, AK on Sun, Dec 22, 2019, 1:16 PM HAST (23:16 UTC), 35 km (22 mi) below the surface.

A larger quake followed: M5.0 119 km SSW of Atka, Alaska. This one was a foreshock.

More in Alaska

Map

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

Open the live map with earthquakes

The earthquake

Magnitude
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-12-22 23:16:47 UTC
Depth
35.0 km (21.7 mi), shallow
Epicenter
51.577° N, 175.653° 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
4.0mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.061 · 73 stations
3.8ML, 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 4.5 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.06
Depth from
Operator assigned
Station coverage gap
185°, poorly surrounded by stations
Stations used
124

Nearby

Within 100 km, magnitude 1.5 and up: 174 in the 60 days after this one and 190 in the 30 days before it.

After

  1. 2.165 km SE of Adak, Alaska · 2475 days ago · 22 km deep · 35 km away
  2. 4.260 km S of Adak, Alaska · 2474 days ago · 35 km deep · 73 km away
  3. 3.754 km S of Adak, Alaska · 2474 days ago · 35 km deep · 71 km away
  4. 2.250 km S of Adak, Alaska · 2473 days ago · 36 km deep · 70 km away
  5. 2.344 km ESE of Adak, Alaska · 2473 days ago · 64 km deep · 33 km away
  6. 2.666 km SSE of Adak, Alaska · 2473 days ago · 35 km deep · 52 km away
  7. 2.071 km ESE of Adak, Alaska · 2472 days ago · 19 km deep · 6 km away
  8. 2.2Andreanof Islands, Aleutian Islands, Alaska · 2469 days ago · 54 km deep · 37 km away
  9. 2.025 km ENE of Adak, Alaska · 2468 days ago · 7 km deep · 59 km away
  10. 1.886 km SW of Atka, Alaska · 2467 days ago · 26 km deep · 35 km away
  11. 2.047 km SSW of Atka, Alaska · 2467 days ago · 36 km deep · 82 km away
  12. 1.635 km SW of Adak, Alaska · 2467 days ago · 16 km deep · 97 km away
  13. 1.924 km ESE of Adak, Alaska · 2467 days ago · 71 km deep · 50 km away
  14. 4.624 km S of Adak, Alaska · 2467 days ago · 54 km deep · 72 km away · felt by 1
  15. 1.644 km S of Adak, Alaska · 2466 days ago · 33 km deep · 70 km away
  16. 1.774 km SE of Adak, Alaska · 2466 days ago · 15 km deep · 23 km away
  17. 2.290 km SE of Adak, Alaska · 2466 days ago · 26 km deep · 21 km away
  18. 2.416 km SSE of Adak, Alaska · 2465 days ago · 74 km deep · 62 km away
  19. 1.853 km SSE of Adak, Alaska · 2465 days ago · 26 km deep · 40 km away
  20. 1.847 km WSW of Atka, Alaska · 2465 days ago · 78 km deep · 76 km away
  21. 1.529 km SSE of Adak, Alaska · 2464 days ago · 52 km deep · 56 km away
  22. 2.092 km SW of Atka, Alaska · 2464 days ago · 26 km deep · 34 km away
  23. 1.774 km SE of Adak, Alaska · 2464 days ago · 18 km deep · 18 km away
  24. 2.475 km ENE of Adak, Alaska · 2463 days ago · 177 km deep · 72 km away
  25. 1.876 km E of Adak, Alaska · 2463 days ago · 91 km deep · 36 km away
  26. 2.030 km SSE of Adak, Alaska · 2463 days ago · 47 km deep · 55 km away
  27. 2.6101 km SW of Atka, Alaska · 2463 days ago · 29 km deep · 31 km away
  28. 1.946 km WSW of Atka, Alaska · 2463 days ago · 74 km deep · 75 km away
  29. 2.251 km SE of Adak, Alaska · 2462 days ago · 47 km deep · 37 km away
  30. 1.955 km SE of Adak, Alaska · 2462 days ago · 23 km deep · 38 km away
  31. 2.466 km SE of Adak, Alaska · 2462 days ago · 24 km deep · 13 km away
  32. 1.730 km S of Adak, Alaska · 2461 days ago · 70 km deep · 63 km away
  33. 2.738 km S of Atka, Alaska · 2460 days ago · 81 km deep · 99 km away
  34. 1.971 km S of Adak, Alaska · 2460 days ago · 20 km deep · 74 km away
  35. 1.773 km SSE of Adak, Alaska · 2460 days ago · 26 km deep · 65 km away
  36. 2.169 km ENE of Adak, Alaska · 2460 days ago · 143 km deep · 54 km away
  37. 1.944 km SSE of Adak, Alaska · 2459 days ago · 32 km deep · 49 km away
  38. 2.669 km SSE of Adak, Alaska · 2459 days ago · 35 km deep · 38 km away
  39. 1.961 km SE of Adak, Alaska · 2456 days ago · 26 km deep · 23 km away
  40. 2.387 km SW of Atka, Alaska · 2456 days ago · 27 km deep · 41 km away
  41. 1.888 km ESE of Adak, Alaska · 2456 days ago · 18 km deep · 15 km away
  42. 2.562 km ENE of Adak, Alaska · 2455 days ago · 224 km deep · 67 km away
  43. 1.69 km ENE of Adak, Alaska · 2454 days ago · 72 km deep · 70 km away
  44. 1.651 km SSW of Adak, Alaska · 2454 days ago · 48 km deep · 85 km away
  45. 1.975 km E of Adak, Alaska · 2454 days ago · 13 km deep · 21 km away
  46. 1.759 km S of Atka, Alaska · 2454 days ago · 11 km deep · 91 km away
  47. 1.887 km ESE of Adak, Alaska · 2454 days ago · 35 km deep · 15 km away
  48. 1.572 km S of Adak, Alaska · 2454 days ago · 27 km deep · 73 km away
  49. 3.369 km SE of Adak, Alaska · 2452 days ago · 29 km deep · 36 km away
  50. 2.460 km SSE of Adak, Alaska · 2452 days ago · 26 km deep · 39 km away
  51. 2.954 km SSE of Adak, Alaska · 2452 days ago · 34 km deep · 55 km away
  52. 2.023 km WSW of Adak, Alaska · 2451 days ago · 75 km deep · 91 km away
  53. 4.787 km SW of Atka, Alaska · 2450 days ago · 42 km deep · 35 km away · felt by 1
  54. 1.989 km SW of Atka, Alaska · 2450 days ago · 21 km deep · 33 km away
  55. 3.491 km SW of Atka, Alaska · 2450 days ago · 29 km deep · 33 km away
  56. 1.541 km ENE of Adak, Alaska · 2450 days ago · 17 km deep · 59 km away
  57. 2.1105 km ESE of Adak, Alaska · 2450 days ago · 26 km deep · 31 km away
  58. 1.849 km SSE of Adak, Alaska · 2450 days ago · 24 km deep · 47 km away
  59. 2.867 km ESE of Adak, Alaska · 2449 days ago · 43 km deep · 8 km away
  60. 2.182 km SE of Adak, Alaska · 2449 days ago · 21 km deep · 17 km away

The first 60 of 174.

Before

  1. 2.6106 km ESE of Adak, Alaska · 2476 days ago · 28 km deep · 32 km away
  2. 2.252 km SSE of Adak, Alaska · 2477 days ago · 26 km deep · 42 km away
  3. 2.744 km SSW of Adak, Alaska · 2477 days ago · 35 km deep · 88 km away
  4. 2.973 km W of Atka, Alaska · 2478 days ago · 249 km deep · 80 km away
  5. 2.066 km SE of Adak, Alaska · 2478 days ago · 26 km deep · 35 km away
  6. 2.456 km SSW of Atka, Alaska · 2479 days ago · 24 km deep · 74 km away
  7. 1.843 km ENE of Adak, Alaska · 2479 days ago · 6 km deep · 59 km away
  8. 1.889 km SW of Atka, Alaska · 2480 days ago · 37 km deep · 32 km away
  9. 2.724 km W of Atka, Alaska · 2481 days ago · 35 km deep · 99 km away
  10. 1.768 km S of Adak, Alaska · 2482 days ago · 24 km deep · 88 km away
  11. 1.889 km SW of Atka, Alaska · 2482 days ago · 26 km deep · 42 km away
  12. 2.673 km ENE of Adak, Alaska · 2482 days ago · 155 km deep · 68 km away
  13. 2.371 km SE of Adak, Alaska · 2482 days ago · 27 km deep · 29 km away
  14. 2.273 km W of Atka, Alaska · 2482 days ago · 135 km deep · 69 km away
  15. 2.880 km ESE of Adak, Alaska · 2482 days ago · 53 km deep · 9 km away
  16. 1.958 km SE of Adak, Alaska · 2483 days ago · 33 km deep · 22 km away
  17. 2.071 km SW of Atka, AK · 2483 days ago · 42 km deep · 51 km away
  18. 2.3123 km SSW of Atka, Alaska · 2483 days ago · 13 km deep · 66 km away
  19. 2.530 km ESE of Adak, Alaska · 2483 days ago · 75 km deep · 45 km away
  20. 2.260 km SSE of Adak, Alaska · 2483 days ago · 23 km deep · 40 km away

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us70006pzi (also filed as ak019gd541xi). Read Fri, Oct 2, 2026, 8:21 PM UTC.