Alaska earthquakes

M5.6 earthquake 39 km ESE of Chiniak, Alaska

A magnitude 5.6 earthquake struck 39 km ESE of Chiniak, Alaska on Fri, Mar 27, 1964, 10:39 PM GMT-10 (08:39 UTC), 23 km (14 mi) below the surface.

A larger quake followed: M6.2 53 km ESE 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
1964-03-28 08:39:56 UTC
Depth
22.5 km (14.0 mi), shallow
Epicenter
57.449° N, 151.690° 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
±0.20
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: 13 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 5.53 km E of Kodiak, Alaska · 22823 days ago · 25 km deep · 55 km away
  2. 6.253 km ESE of Old Harbor, Alaska · 22823 days ago · 25 km deep · 65 km away
  3. 5.682 km ENE of Kodiak, Alaska · 22823 days ago · 22 km deep · 76 km away
  4. 5.6108 km ENE of Chiniak, Alaska · 22822 days ago · 20 km deep · 89 km away
  5. 5.668 km ESE of Chiniak, Alaska · 22822 days ago · 20 km deep · 29 km away
  6. 5.550 km ESE of Chiniak, Alaska · 22822 days ago · 21 km deep · 12 km away
  7. 6.094 km SE of Old Harbor, Alaska · 22821 days ago · 15 km deep · 100 km away
  8. 5.784 km SE of Chiniak, Alaska · 22819 days ago · 23 km deep · 47 km away
  9. 5.956 km SE of Old Harbor, Alaska · 22816 days ago · 22 km deep · 97 km away
  10. 5.647 km ESE of Chiniak, Alaska · 22807 days ago · 27 km deep · 10 km away
  11. 5.89 km ENE of Port Lions, Alaska · 22805 days ago · 22 km deep · 80 km away
  12. 5.541 km E of Chiniak, Alaska · 22803 days ago · 20 km deep · 20 km away
  13. 5.645 km SSE of Chiniak, Alaska · 22797 days ago · 25 km deep · 24 km away

Before

  1. 5.884 km ENE of Kodiak, Alaska · 22823 days ago · 21 km deep · 76 km away
  2. 5.855 km SE of Chiniak, Alaska · 22823 days ago · 20 km deep · 20 km away
  3. 6.578 km ENE of Ouzinkie, Alaska · 22823 days ago · 25 km deep · 87 km away
  4. 5.925 km E of Old Harbor, Alaska · 22823 days ago · 25 km deep · 79 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem869858 (also filed as ushis2654). Read Tue, Sep 22, 2026, 7:41 AM UTC.