Alaska earthquakes

M4.7 earthquake 84 km SW of Adak, Alaska

A magnitude 4.7 earthquake struck 84 km SW of Adak, Alaska on Mon, Oct 21, 1996, 7:10 PM HADT (04:10 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 Andreanof Islands, Aleutian Islands, 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
4.7 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1996-10-22 04:10:20 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.403° N, 177.588° 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
4.7mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · 16 stations
4.7mb, body-waveAlaska 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.

Depth from
OPERATOR_ASSIGNED

Nearby

Within 100 km, magnitude 1.7 and up: 30 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.4134 km WSW of Adak, Alaska · 10939 days ago · 33 km deep · 57 km away
  2. 4.754 km SW of Adak, Alaska · 10938 days ago · 42 km deep · 31 km away
  3. 5.2142 km WSW of Adak, Alaska · 10938 days ago · 33 km deep · 63 km away
  4. 4.680 km SSW of Adak, Alaska · 10935 days ago · 33 km deep · 32 km away
  5. 5.0121 km WSW of Adak, Alaska · 10934 days ago · 33 km deep · 45 km away
  6. 4.661 km SSW of Adak, Alaska · 10925 days ago · 33 km deep · 49 km away
  7. 4.8105 km SSW of Adak, Alaska · 10916 days ago · 33 km deep · 52 km away
  8. 4.5145 km WSW of Adak, Alaska · 10915 days ago · 33 km deep · 71 km away
  9. 5.033 km SE of Adak, Alaska · 10906 days ago · 48 km deep · 98 km away
  10. 5.4Andreanof Islands, Aleutian Islands, Alaska · 10890 days ago · 10 km deep · 47 km away
  11. 4.561 km W of Adak, Alaska · 10890 days ago · 10 km deep · 46 km away
  12. 4.862 km W of Adak, Alaska · 10890 days ago · 10 km deep · 44 km away
  13. 4.860 km W of Adak, Alaska · 10890 days ago · 10 km deep · 49 km away
  14. 3.656 km W of Adak, Alaska · 10890 days ago · 10 km deep · 46 km away
  15. 3.761 km WSW of Adak, Alaska · 10890 days ago · 10 km deep · 28 km away
  16. 3.459 km W of Adak, Alaska · 10890 days ago · 10 km deep · 53 km away
  17. 3.348 km SSW of Adak, Alaska · 10890 days ago · 10 km deep · 47 km away
  18. 4.958 km WSW of Adak, Alaska · 10889 days ago · 10 km deep · 29 km away
  19. 4.365 km WSW of Adak, Alaska · 10889 days ago · 10 km deep · 34 km away
  20. 4.659 km W of Adak, Alaska · 10889 days ago · 10 km deep · 54 km away
  21. 4.558 km WSW of Adak, Alaska · 10889 days ago · 10 km deep · 32 km away
  22. 3.255 km W of Adak, Alaska · 10888 days ago · 10 km deep · 45 km away
  23. 3.866 km WSW of Adak, Alaska · 10888 days ago · 10 km deep · 27 km away
  24. 3.156 km WSW of Adak, Alaska · 10888 days ago · 10 km deep · 40 km away
  25. 4.557 km W of Adak, Alaska · 10888 days ago · 10 km deep · 43 km away
  26. 4.562 km WSW of Adak, Alaska · 10888 days ago · 10 km deep · 27 km away
  27. 4.762 km WSW of Adak, Alaska · 10888 days ago · 10 km deep · 32 km away
  28. 4.552 km WSW of Adak, Alaska · 10888 days ago · 10 km deep · 38 km away
  29. 4.3138 km W of Adak, Alaska · 10884 days ago · 33 km deep · 77 km away
  30. 4.161 km W of Adak, Alaska · 10883 days ago · 10 km deep · 42 km away

Before

  1. 4.2145 km WSW of Adak, Alaska · 10949 days ago · 33 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0007rrz (also filed as ak996dllimy6). Read Mon, Oct 5, 2026, 2:46 AM UTC.