Alaska earthquakes

M5.6 earthquake 87 km SSE of Old Harbor, Alaska

A magnitude 5.6 earthquake struck 87 km SSE of Old Harbor, Alaska on Tue, Mar 31, 1964, 1:53 AM GMT-10 (11:53 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M6.1 95 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
5.6 (mw), moderate
Local time
UTC
1964-03-31 11:53:15 UTC
Depth
20.0 km (12.4 mi), shallow
Epicenter
56.533° N, 152.562° 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
±0.24
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: 15 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 5.489 km SSE of Old Harbor, Alaska · 22818 days ago · 25 km deep · 6 km away
  2. 6.195 km SSE of Old Harbor, Alaska · 22816 days ago · 15 km deep · 22 km away
  3. 5.956 km SE of Old Harbor, Alaska · 22816 days ago · 22 km deep · 32 km away
  4. 6.395 km SSE of Akhiok, Alaska · 22815 days ago · 23 km deep · 62 km away
  5. 6.195 km SSE of Akhiok, Alaska · 22815 days ago · 28 km deep · 71 km away
  6. 6.398 km SE of Old Harbor, Alaska · 22808 days ago · 10 km deep · 14 km away
  7. 5.7133 km SE of Old Harbor, Alaska · 22808 days ago · 15 km deep · 57 km away
  8. 5.5111 km SSE of Old Harbor, Alaska · 22807 days ago · 11 km deep · 24 km away
  9. 6.495 km S of Old Harbor, Alaska · 22804 days ago · 23 km deep · 33 km away
  10. 6.199 km SSE of Old Harbor, Alaska · 22803 days ago · 10 km deep · 32 km away
  11. 5.891 km SSE of Akhiok, Alaska · 22802 days ago · 22 km deep · 87 km away
  12. 5.645 km SSE of Chiniak, Alaska · 22797 days ago · 25 km deep · 90 km away
  13. 5.8102 km SE of Old Harbor, Alaska · 22784 days ago · 21 km deep · 27 km away
  14. 5.847 km S of Akhiok, Alaska · 22782 days ago · 25 km deep · 96 km away
  15. 6.297 km SSE of Old Harbor, Alaska · 22778 days ago · 24 km deep · 11 km away

Before

  1. 6.094 km SE of Old Harbor, Alaska · 22821 days ago · 15 km deep · 23 km away
  2. 5.8101 km SSE of Old Harbor, Alaska · 22821 days ago · 9 km deep · 19 km away
  3. 5.890 km SSE of Old Harbor, Alaska · 22821 days ago · 20 km deep · 13 km away
  4. 5.692 km SSE of Old Harbor, Alaska · 22821 days ago · 23 km deep · 7 km away
  5. 6.585 km SSE of Old Harbor, Alaska · 22821 days ago · 21 km deep · 29 km away
  6. 6.253 km ESE of Old Harbor, Alaska · 22823 days ago · 25 km deep · 57 km away
  7. 5.872 km SSE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 23 km away
  8. 5.9114 km SE of Old Harbor, Alaska · 22823 days ago · 20 km deep · 30 km away
  9. 5.925 km E of Old Harbor, Alaska · 22823 days ago · 25 km deep · 72 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem870244. Read Tue, Sep 22, 2026, 10:45 AM UTC.