Alaska earthquakes

M4.7 earthquake 76 km SSE of Old Harbor, Alaska

A magnitude 4.7 earthquake struck 76 km SSE of Old Harbor, Alaska on Tue, Apr 11, 1978, 6:26 PM GMT-10 (04:26 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M5.1 93 km SSE of Old Harbor, Alaska. This one was a foreshock.

Womens Bay forecastMore in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.7 (mb), light
Local time
UTC
1978-04-12 04:26:56 UTC
Depth
16.0 km (9.9 mi), shallow
Epicenter
56.627° N, 152.630° 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.

Stations used
18

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.7 and up: 13 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.6105 km SSE of Old Harbor, Alaska · 17695 days ago · 15 km deep · 31 km away
  2. 5.193 km SSE of Old Harbor, Alaska · 17695 days ago · 24 km deep · 19 km away
  3. 4.6103 km SSE of Old Harbor, Alaska · 17695 days ago · 19 km deep · 29 km away
  4. 5.175 km SSE of Old Harbor, Alaska · 17694 days ago · 27 km deep · 14 km away
  5. 3.5172 km SSE of Old Harbor, Alaska · 17694 days ago · 33 km deep · 96 km away
  6. 4.5134 km SSE of Old Harbor, Alaska · 17693 days ago · 33 km deep · 58 km away
  7. 4.397 km SSE of Old Harbor, Alaska · 17692 days ago · 33 km deep · 32 km away
  8. 4.968 km SSE of Old Harbor, Alaska · 17690 days ago · 24 km deep · 9 km away
  9. 4.596 km SSE of Old Harbor, Alaska · 17689 days ago · 33 km deep · 31 km away
  10. 4.7Kodiak Island region, Alaska · 17684 days ago · 33 km deep · 20 km away
  11. 4.778 km SSE of Old Harbor, Alaska · 17680 days ago · 33 km deep · 8 km away
  12. 4.337 km ENE of Old Harbor, Alaska · 17679 days ago · 70 km deep · 73 km away
  13. 4.7104 km SSE of Old Harbor, Alaska · 17655 days ago · 33 km deep · 30 km away

Before

  1. 4.791 km SSE of Old Harbor, Alaska · 17695 days ago · 33 km deep · 16 km away
  2. 5.239 km SE of Akhiok, Alaska · 17695 days ago · 23 km deep · 63 km away
  3. 6.694 km SSE of Old Harbor, Alaska · 17695 days ago · 14 km deep · 23 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000u21. Read Mon, Sep 21, 2026, 8:59 PM UTC.