Alaska earthquakes

M5.7 earthquake 133 km SE of Old Harbor, Alaska

A magnitude 5.7 earthquake struck 133 km SE of Old Harbor, Alaska on Sun, Apr 12, 1964, 2:48 AM GMT-10 (12:48 UTC), 15 km (9 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
5.7 (mw), moderate
Local time
UTC
1964-04-12 12:48:00 UTC
Depth
14.5 km (9.0 mi), shallow
Epicenter
56.416° N, 151.661° 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: 6 in the 60 days after this one and 17 in the 30 days before it.

After

  1. 5.5111 km SSE of Old Harbor, Alaska · 22807 days ago · 11 km deep · 43 km away
  2. 6.495 km S of Old Harbor, Alaska · 22803 days ago · 23 km deep · 83 km away
  3. 6.199 km SSE of Old Harbor, Alaska · 22803 days ago · 10 km deep · 79 km away
  4. 5.645 km SSE of Chiniak, Alaska · 22797 days ago · 25 km deep · 95 km away
  5. 5.8102 km SE of Old Harbor, Alaska · 22784 days ago · 21 km deep · 32 km away
  6. 6.297 km SSE of Old Harbor, Alaska · 22777 days ago · 24 km deep · 47 km away

Before

  1. 6.398 km SE of Old Harbor, Alaska · 22808 days ago · 10 km deep · 43 km away
  2. 5.8193 km SSE of Old Harbor, Alaska · 22812 days ago · 15 km deep · 91 km away
  3. 5.956 km SE of Old Harbor, Alaska · 22816 days ago · 22 km deep · 79 km away
  4. 6.195 km SSE of Old Harbor, Alaska · 22816 days ago · 15 km deep · 71 km away
  5. 5.489 km SSE of Old Harbor, Alaska · 22818 days ago · 25 km deep · 60 km away
  6. 5.784 km SE of Chiniak, Alaska · 22819 days ago · 23 km deep · 80 km away
  7. 5.687 km SSE of Old Harbor, Alaska · 22820 days ago · 20 km deep · 57 km away
  8. 6.094 km SE of Old Harbor, Alaska · 22821 days ago · 15 km deep · 39 km away
  9. 5.8101 km SSE of Old Harbor, Alaska · 22821 days ago · 9 km deep · 60 km away
  10. 5.890 km SSE of Old Harbor, Alaska · 22821 days ago · 20 km deep · 65 km away
  11. 5.692 km SSE of Old Harbor, Alaska · 22821 days ago · 23 km deep · 57 km away
  12. 6.585 km SSE of Old Harbor, Alaska · 22821 days ago · 21 km deep · 83 km away
  13. 5.668 km ESE of Chiniak, Alaska · 22822 days ago · 20 km deep · 100 km away
  14. 6.253 km ESE of Old Harbor, Alaska · 22823 days ago · 25 km deep · 86 km away
  15. 5.872 km SSE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 80 km away
  16. 5.9114 km SE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 29 km away
  17. 5.855 km SE of Chiniak, Alaska · 22823 days ago · 20 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem868669. Read Tue, Sep 22, 2026, 5:21 AM UTC.