Alaska earthquakes

M6.1 earthquake 99 km SSE of Old Harbor, Alaska

A magnitude 6.1 earthquake struck 99 km SSE of Old Harbor, Alaska on Thu, Apr 16, 1964, 6:49 PM GMT-10 (04:49 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M6.2 97 km SSE of Old Harbor, Alaska. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
6.1 (mw), strong
Local time
UTC
1964-04-17 04:49:30 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
56.336° N, 152.937° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Magnitude uncertainty
±0.30
Depth from
From location

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 2.5 and up: 4 in the 60 days after this one and 26 in the 30 days before it.

After

  1. 5.891 km SSE of Akhiok, Alaska · 22801 days ago · 22 km deep · 57 km away
  2. 5.8102 km SE of Old Harbor, Alaska · 22784 days ago · 21 km deep · 55 km away
  3. 5.847 km S of Akhiok, Alaska · 22782 days ago · 25 km deep · 76 km away
  4. 6.297 km SSE of Old Harbor, Alaska · 22778 days ago · 24 km deep · 35 km away

Before

  1. 6.495 km S of Old Harbor, Alaska · 22804 days ago · 23 km deep · 5 km away
  2. 6.254 km S of Akhiok, Alaska · 22805 days ago · 29 km deep · 83 km away
  3. 5.5111 km SSE of Old Harbor, Alaska · 22807 days ago · 11 km deep · 36 km away
  4. 5.7133 km SE of Old Harbor, Alaska · 22808 days ago · 15 km deep · 79 km away
  5. 6.398 km SE of Old Harbor, Alaska · 22808 days ago · 10 km deep · 40 km away
  6. 5.8193 km SSE of Old Harbor, Alaska · 22813 days ago · 15 km deep · 98 km away
  7. 6.195 km SSE of Akhiok, Alaska · 22815 days ago · 28 km deep · 39 km away
  8. 6.395 km SSE of Akhiok, Alaska · 22815 days ago · 23 km deep · 30 km away
  9. 6.570 km SSW of Akhiok, Alaska · 22816 days ago · 23 km deep · 96 km away
  10. 6.378 km SSW of Akhiok, Alaska · 22816 days ago · 20 km deep · 93 km away
  11. 5.956 km SE of Old Harbor, Alaska · 22816 days ago · 22 km deep · 53 km away
  12. 6.195 km SSE of Old Harbor, Alaska · 22816 days ago · 15 km deep · 10 km away
  13. 5.489 km SSE of Old Harbor, Alaska · 22818 days ago · 25 km deep · 26 km away
  14. 5.687 km SSE of Old Harbor, Alaska · 22820 days ago · 20 km deep · 32 km away
  15. 6.094 km SE of Old Harbor, Alaska · 22821 days ago · 15 km deep · 53 km away
  16. 5.8101 km SSE of Old Harbor, Alaska · 22821 days ago · 9 km deep · 19 km away
  17. 5.890 km SSE of Old Harbor, Alaska · 22821 days ago · 20 km deep · 19 km away
  18. 5.692 km SSE of Old Harbor, Alaska · 22821 days ago · 23 km deep · 27 km away
  19. 6.585 km SSE of Old Harbor, Alaska · 22821 days ago · 21 km deep · 14 km away
  20. 6.289 km S of Akhiok, Alaska · 22822 days ago · 22 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem868842 (also filed as ushis2695). Read Tue, Sep 22, 2026, 7:00 AM UTC.