Alaska earthquakes

M3.8 earthquake 112 km SSW of Atka, Alaska

A magnitude 3.8 earthquake struck 112 km SSW of Atka, Alaska on Sat, Dec 29, 2018, 10:17 PM HAST (08:17 UTC), 31 km (19 mi) below the surface.

A larger quake followed: M4.1 69 km SSE 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
3.8 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2018-12-30 08:17:47 UTC
Depth
31.3 km (19.4 mi), shallow
Epicenter
51.282° N, 174.904° 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
3.8mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.161 · 10 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 9.8 km horizontally, 19.6 km in depth
Magnitude uncertainty
±0.16
Depth from
From location
Station coverage gap
230°, poorly surrounded by stations
Stations used
22

Nearby

Within 100 km, magnitude 1.5 and up: 48 in the 60 days after this one and 33 in the 30 days before it.

After

  1. 2.9117 km SSW of Atka, Alaska · 2832 days ago · 20 km deep · 5 km away
  2. 1.959 km SSE of Adak, Alaska · 2832 days ago · 13 km deep · 89 km away
  3. 2.592 km SW of Atka, Alaska · 2832 days ago · 47 km deep · 46 km away
  4. 2.266 km SW of Atka, Alaska · 2832 days ago · 19 km deep · 54 km away
  5. 3.762 km SE of Adak, Alaska · 2831 days ago · 35 km deep · 80 km away
  6. 3.078 km SE of Adak, Alaska · 2831 days ago · 35 km deep · 75 km away
  7. 2.573 km SSE of Adak, Alaska · 2831 days ago · 35 km deep · 80 km away
  8. 3.069 km SSE of Adak, Alaska · 2831 days ago · 35 km deep · 83 km away
  9. 1.854 km SW of Atka, Alaska · 2828 days ago · 49 km deep · 62 km away
  10. 2.060 km SE of Adak, Alaska · 2828 days ago · 21 km deep · 88 km away
  11. 2.154 km SE of Adak, Alaska · 2827 days ago · 23 km deep · 91 km away
  12. 2.254 km ESE of Adak, Alaska · 2826 days ago · 61 km deep · 83 km away
  13. 2.331 km WSW of Atka, Alaska · 2824 days ago · 94 km deep · 88 km away
  14. 1.963 km ESE of Adak, Alaska · 2822 days ago · 46 km deep · 73 km away
  15. 2.170 km ESE of Adak, Alaska · 2822 days ago · 50 km deep · 67 km away
  16. 2.4120 km SSW of Atka, Alaska · 2821 days ago · 26 km deep · 7 km away
  17. 2.448 km SE of Adak, Alaska · 2817 days ago · 56 km deep · 89 km away
  18. 2.6121 km SSW of Atka, Alaska · 2816 days ago · 17 km deep · 10 km away
  19. 2.276 km ESE of Adak, Alaska · 2816 days ago · 51 km deep · 65 km away
  20. 2.350 km SSW of Atka, Alaska · 2815 days ago · 22 km deep · 62 km away
  21. 2.372 km E of Adak, Alaska · 2815 days ago · 85 km deep · 82 km away
  22. 2.544 km SE of Adak, Alaska · 2814 days ago · 43 km deep · 95 km away
  23. 2.296 km ESE of Adak, Alaska · 2811 days ago · 25 km deep · 41 km away
  24. 2.644 km SSE of Adak, Alaska · 2808 days ago · 55 km deep · 100 km away
  25. 4.169 km SSE of Adak, Alaska · 2806 days ago · 35 km deep · 91 km away
  26. 2.690 km SSE of Adak, Alaska · 2806 days ago · 21 km deep · 91 km away
  27. 2.274 km SSE of Adak, Alaska · 2806 days ago · 20 km deep · 98 km away
  28. 3.193 km ESE of Adak, Alaska · 2805 days ago · 35 km deep · 44 km away
  29. 1.853 km SSE of Adak, Alaska · 2804 days ago · 24 km deep · 95 km away
  30. 2.361 km SSE of Adak, Alaska · 2802 days ago · 10 km deep · 89 km away
  31. 2.6Andreanof Islands, Aleutian Islands, Alaska · 2801 days ago · 11 km deep · 89 km away
  32. 2.577 km SSE of Adak, Alaska · 2800 days ago · 10 km deep · 88 km away
  33. 2.796 km S of Atka, Alaska · 2799 days ago · 35 km deep · 37 km away
  34. 2.574 km ESE of Adak, Alaska · 2799 days ago · 35 km deep · 62 km away
  35. 3.860 km ESE of Adak, Alaska · 2796 days ago · 50 km deep · 77 km away · felt by 2
  36. 2.460 km SSE of Adak, Alaska · 2795 days ago · 26 km deep · 96 km away
  37. 2.373 km E of Adak, Alaska · 2794 days ago · 65 km deep · 74 km away
  38. 4.125 km SSW of Atka, Alaska · 2788 days ago · 4 km deep · 87 km away
  39. 2.177 km SE of Adak, Alaska · 2788 days ago · 16 km deep · 63 km away
  40. 2.452 km SE of Adak, Alaska · 2787 days ago · 57 km deep · 88 km away
  41. 2.583 km SE of Adak, Alaska · 2787 days ago · 35 km deep · 65 km away
  42. 4.137 km S of Atka, Alaska · 2786 days ago · 67 km deep · 85 km away
  43. 2.459 km SSE of Adak, Alaska · 2786 days ago · 20 km deep · 90 km away
  44. 1.961 km SE of Adak, Alaska · 2784 days ago · 26 km deep · 86 km away
  45. 2.050 km S of Atka, Alaska · 2784 days ago · 0 km deep · 75 km away
  46. 2.174 km ESE of Adak, Alaska · 2782 days ago · 46 km deep · 66 km away
  47. 2.595 km SW of Atka, Alaska · 2780 days ago · 35 km deep · 40 km away
  48. 3.064 km SSE of Adak, Alaska · 2777 days ago · 35 km deep · 100 km away

Before

  1. 2.556 km SE of Adak, Alaska · 2834 days ago · 31 km deep · 87 km away
  2. 2.6106 km SE of Adak, Alaska · 2834 days ago · 26 km deep · 32 km away
  3. 1.839 km SSE of Atka, Alaska · 2835 days ago · 36 km deep · 90 km away
  4. 2.160 km ESE of Adak, Alaska · 2836 days ago · 48 km deep · 77 km away
  5. 1.773 km E of Adak, Alaska · 2836 days ago · 31 km deep · 75 km away
  6. 2.660 km SE of Adak, Alaska · 2836 days ago · 48 km deep · 83 km away
  7. 1.953 km SSW of Atka, Alaska · 2838 days ago · 16 km deep · 59 km away
  8. 2.7118 km SSW of Atka, Alaska · 2838 days ago · 26 km deep · 7 km away
  9. 3.2115 km SSW of Atka, Alaska · 2838 days ago · 22 km deep · 8 km away
  10. 2.063 km SE of Adak, Alaska · 2839 days ago · 30 km deep · 84 km away
  11. 2.356 km ESE of Adak, Alaska · 2840 days ago · 66 km deep · 83 km away
  12. 2.122 km SW of Atka, Alaska · 2842 days ago · 64 km deep · 91 km away
  13. 2.156 km SSE of Adak, Alaska · 2842 days ago · 23 km deep · 96 km away
  14. 4.1101 km ESE of Adak, Alaska · 2844 days ago · 10 km deep · 38 km away
  15. 2.760 km SW of Atka, Alaska · 2844 days ago · 26 km deep · 62 km away
  16. 1.531 km W of Atka, Alaska · 2846 days ago · 13 km deep · 100 km away
  17. 2.260 km SSE of Atka, Alaska · 2846 days ago · 34 km deep · 77 km away
  18. 2.466 km E of Adak, Alaska · 2847 days ago · 159 km deep · 94 km away
  19. 1.692 km ESE of Adak, Alaska · 2847 days ago · 34 km deep · 55 km away
  20. 1.856 km SSW of Atka, Alaska · 2847 days ago · 38 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000j55k (also filed as ak018gq4hji5). Read Thu, Oct 1, 2026, 8:09 PM UTC.