Alaska earthquakes

M3.8 earthquake 135 km SE of Atka, Alaska

A magnitude 3.8 earthquake struck 135 km SE of Atka, Alaska on Sun, Oct 9, 2016, 8:31 AM HADT (17:31 UTC), 50 km (31 mi) below the surface.

A larger quake followed: M5.0 73 km SE of Atka, 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
2016-10-09 17:31:14 UTC
Depth
49.6 km (30.8 mi), shallow
Epicenter
51.523° N, 172.555° 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 · ±0.082 · 39 stations
3.2ML, 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 13.7 km horizontally, 16.7 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
222°, poorly surrounded by stations
Stations used
46

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.555 km SE of Atka, Alaska · 3646 days ago · 49 km deep · 81 km away
  2. 4.1113 km SE of Atka, Alaska · 3644 days ago · 42 km deep · 44 km away
  3. 4.4198 km E of Atka, Alaska · 3640 days ago · 37 km deep · 98 km away
  4. 3.6197 km ESE of Atka, Alaska · 3635 days ago · 37 km deep · 88 km away
  5. 5.073 km SE of Atka, Alaska · 3628 days ago · 39 km deep · 69 km away
  6. 3.778 km SE of Atka, Alaska · 3628 days ago · 42 km deep · 68 km away
  7. 2.653 km E of Atka, Alaska · 3627 days ago · 85 km deep · 97 km away
  8. 3.188 km SE of Atka, Alaska · 3625 days ago · 33 km deep · 63 km away
  9. 2.684 km E of Atka, Alaska · 3622 days ago · 71 km deep · 77 km away
  10. 2.571 km ESE of Atka, Alaska · 3620 days ago · 40 km deep · 65 km away
  11. 2.372 km SE of Atka, Alaska · 3617 days ago · 26 km deep · 64 km away
  12. 2.7182 km ESE of Atka, Alaska · 3614 days ago · 18 km deep · 74 km away
  13. 2.8195 km E of Atka, Alaska · 3610 days ago · 26 km deep · 91 km away
  14. 2.444 km SE of Atka, Alaska · 3609 days ago · 36 km deep · 96 km away
  15. 4.4163 km ESE of Atka, Alaska · 3605 days ago · 24 km deep · 56 km away
  16. 4.2156 km ESE of Atka, Alaska · 3605 days ago · 10 km deep · 24 km away
  17. 3.758 km ESE of Atka, Alaska · 3598 days ago · 32 km deep · 77 km away
  18. 4.2200 km ESE of Atka, Alaska · 3597 days ago · 37 km deep · 91 km away
  19. 2.699 km ESE of Atka, Alaska · 3596 days ago · 43 km deep · 37 km away
  20. 3.167 km SSE of Atka, Alaska · 3589 days ago · 30 km deep · 89 km away
  21. 2.071 km SE of Atka, Alaska · 3589 days ago · 20 km deep · 65 km away
  22. 3.2190 km E of Atka, Alaska · 3588 days ago · 36 km deep · 97 km away
  23. 3.2185 km E of Atka, Alaska · 3587 days ago · 41 km deep · 99 km away

Before

  1. 3.2148 km ESE of Atka, Alaska · 3652 days ago · 14 km deep · 39 km away
  2. 2.6160 km SSE of Atka, Alaska · 3658 days ago · 28 km deep · 74 km away
  3. 3.896 km SE of Atka, Alaska · 3670 days ago · 59 km deep · 40 km away
  4. 2.171 km SSE of Atka, Alaska · 3674 days ago · 20 km deep · 80 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20007e5e (also filed as ak016d0be9cg). Read Sun, Oct 4, 2026, 3:14 AM UTC.