Alaska earthquakes

M5.6 earthquake 45 km SSE of Chiniak, Alaska

A magnitude 5.6 earthquake struck 45 km SSE of Chiniak, Alaska on Thu, Apr 23, 1964, 4:56 AM GMT-10 (14:56 UTC), 25 km (16 mi) below the surface.

A larger quake followed: M5.8 102 km SE 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
5.6 (mw), moderate
Local time
UTC
1964-04-23 14:56:32 UTC
Depth
25.0 km (15.5 mi), shallow
Epicenter
57.260° N, 151.894° 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
±0.27
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: 3 in the 60 days after this one and 20 in the 30 days before it.

After

  1. 5.8102 km SE of Old Harbor, Alaska · 22784 days ago · 21 km deep · 81 km away
  2. 6.297 km SSE of Old Harbor, Alaska · 22777 days ago · 24 km deep · 93 km away
  3. 5.420 km NNE of Ouzinkie, Alaska · 22753 days ago · 13 km deep · 97 km away

Before

  1. 5.541 km E of Chiniak, Alaska · 22803 days ago · 20 km deep · 44 km away
  2. 5.89 km ENE of Port Lions, Alaska · 22805 days ago · 22 km deep · 87 km away
  3. 5.647 km ESE of Chiniak, Alaska · 22807 days ago · 27 km deep · 33 km away
  4. 5.7133 km SE of Old Harbor, Alaska · 22808 days ago · 15 km deep · 95 km away
  5. 6.398 km SE of Old Harbor, Alaska · 22808 days ago · 10 km deep · 90 km away
  6. 5.956 km SE of Old Harbor, Alaska · 22816 days ago · 22 km deep · 73 km away
  7. 5.489 km SSE of Old Harbor, Alaska · 22818 days ago · 25 km deep · 96 km away
  8. 5.784 km SE of Chiniak, Alaska · 22819 days ago · 23 km deep · 43 km away
  9. 5.687 km SSE of Old Harbor, Alaska · 22820 days ago · 20 km deep · 90 km away
  10. 6.094 km SE of Old Harbor, Alaska · 22820 days ago · 15 km deep · 76 km away
  11. 5.692 km SSE of Old Harbor, Alaska · 22821 days ago · 23 km deep · 97 km away
  12. 5.550 km ESE of Chiniak, Alaska · 22822 days ago · 21 km deep · 33 km away
  13. 5.668 km ESE of Chiniak, Alaska · 22822 days ago · 20 km deep · 36 km away
  14. 6.253 km ESE of Old Harbor, Alaska · 22823 days ago · 25 km deep · 43 km away
  15. 5.53 km E of Kodiak, Alaska · 22823 days ago · 25 km deep · 65 km away
  16. 5.872 km SSE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 98 km away
  17. 5.9114 km SE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 96 km away
  18. 5.639 km ESE of Chiniak, Alaska · 22823 days ago · 23 km deep · 24 km away
  19. 5.855 km SE of Chiniak, Alaska · 22823 days ago · 20 km deep · 18 km away
  20. 5.925 km E of Old Harbor, Alaska · 22823 days ago · 25 km deep · 61 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem869040. Read Tue, Sep 22, 2026, 2:56 AM UTC.