Alaska earthquakes

M5.6 earthquake 68 km ESE of Chiniak, Alaska

A magnitude 5.6 earthquake struck 68 km ESE of Chiniak, Alaska on Sat, Mar 28, 1964, 1:46 PM GMT-10 (23:46 UTC), 20 km (12 mi) below the surface.

A larger quake followed: M6.0 94 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
1964-03-28 23:46:21 UTC
Depth
20.0 km (12.4 mi), shallow
Epicenter
57.290° N, 151.305° 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
±0.45
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 8 in the 30 days before it.

After

  1. 5.550 km ESE of Chiniak, Alaska · 22823 days ago · 21 km deep · 22 km away
  2. 6.094 km SE of Old Harbor, Alaska · 22821 days ago · 15 km deep · 94 km away
  3. 5.784 km SE of Chiniak, Alaska · 22819 days ago · 23 km deep · 22 km away
  4. 5.7133 km SE of Old Harbor, Alaska · 22808 days ago · 15 km deep · 100 km away
  5. 5.647 km ESE of Chiniak, Alaska · 22807 days ago · 27 km deep · 25 km away
  6. 5.541 km E of Chiniak, Alaska · 22803 days ago · 20 km deep · 40 km away
  7. 5.645 km SSE of Chiniak, Alaska · 22797 days ago · 25 km deep · 36 km away
  8. 5.8102 km SE of Old Harbor, Alaska · 22784 days ago · 21 km deep · 96 km away

Before

  1. 5.6108 km ENE of Chiniak, Alaska · 22823 days ago · 20 km deep · 90 km away
  2. 5.682 km ENE of Kodiak, Alaska · 22823 days ago · 22 km deep · 86 km away
  3. 6.253 km ESE of Old Harbor, Alaska · 22823 days ago · 25 km deep · 76 km away
  4. 5.53 km E of Kodiak, Alaska · 22823 days ago · 25 km deep · 83 km away
  5. 5.639 km ESE of Chiniak, Alaska · 22823 days ago · 23 km deep · 29 km away
  6. 5.884 km ENE of Kodiak, Alaska · 22823 days ago · 21 km deep · 85 km away
  7. 5.855 km SE of Chiniak, Alaska · 22823 days ago · 20 km deep · 18 km away
  8. 5.925 km E of Old Harbor, Alaska · 22823 days ago · 25 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event iscgem870003 (also filed as ushis2663). Read Tue, Sep 22, 2026, 1:56 PM UTC.