Alaska earthquakes

M6.3 earthquake 98 km SE of Old Harbor, Alaska

A magnitude 6.3 earthquake struck 98 km SE of Old Harbor, Alaska on Sat, Apr 11, 1964, 3:24 PM GMT-10 (01:24 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M6.4 95 km S 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
6.3 (mw), strong
Local time
UTC
1964-04-12 01:24:31 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
56.491° N, 152.343° 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
±0.21
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: 8 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 5.7133 km SE of Old Harbor, Alaska · 22808 days ago · 15 km deep · 43 km away
  2. 5.5111 km SSE of Old Harbor, Alaska · 22807 days ago · 11 km deep · 15 km away
  3. 6.495 km S of Old Harbor, Alaska · 22804 days ago · 23 km deep · 43 km away
  4. 6.199 km SSE of Old Harbor, Alaska · 22803 days ago · 10 km deep · 40 km away
  5. 5.891 km SSE of Akhiok, Alaska · 22802 days ago · 22 km deep · 97 km away
  6. 5.645 km SSE of Chiniak, Alaska · 22797 days ago · 25 km deep · 90 km away
  7. 5.8102 km SE of Old Harbor, Alaska · 22784 days ago · 21 km deep · 15 km away
  8. 6.297 km SSE of Old Harbor, Alaska · 22778 days ago · 24 km deep · 5 km away

Before

  1. 5.8193 km SSE of Old Harbor, Alaska · 22813 days ago · 15 km deep · 99 km away
  2. 6.195 km SSE of Akhiok, Alaska · 22815 days ago · 28 km deep · 80 km away
  3. 6.395 km SSE of Akhiok, Alaska · 22815 days ago · 23 km deep · 71 km away
  4. 5.956 km SE of Old Harbor, Alaska · 22816 days ago · 22 km deep · 42 km away
  5. 6.195 km SSE of Old Harbor, Alaska · 22816 days ago · 15 km deep · 31 km away
  6. 5.489 km SSE of Old Harbor, Alaska · 22818 days ago · 25 km deep · 17 km away
  7. 5.784 km SE of Chiniak, Alaska · 22819 days ago · 23 km deep · 95 km away
  8. 5.687 km SSE of Old Harbor, Alaska · 22820 days ago · 20 km deep · 14 km away
  9. 6.094 km SE of Old Harbor, Alaska · 22821 days ago · 15 km deep · 15 km away
  10. 5.8101 km SSE of Old Harbor, Alaska · 22821 days ago · 9 km deep · 22 km away
  11. 5.890 km SSE of Old Harbor, Alaska · 22821 days ago · 20 km deep · 23 km away
  12. 5.692 km SSE of Old Harbor, Alaska · 22821 days ago · 23 km deep · 15 km away
  13. 6.585 km SSE of Old Harbor, Alaska · 22821 days ago · 21 km deep · 41 km away
  14. 6.253 km ESE of Old Harbor, Alaska · 22823 days ago · 25 km deep · 62 km away
  15. 5.872 km SSE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 37 km away
  16. 5.9114 km SE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 17 km away
  17. 5.855 km SE of Chiniak, Alaska · 22823 days ago · 20 km deep · 98 km away
  18. 5.925 km E of Old Harbor, Alaska · 22823 days ago · 25 km deep · 81 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem868644 (also filed as ushis2689). Read Tue, Sep 22, 2026, 8:41 AM UTC.