Alaska earthquakes

M4.5 earthquake 96 km SSE of Old Harbor, Alaska

A magnitude 4.5 earthquake struck 96 km SSE of Old Harbor, Alaska on Mon, Apr 17, 1978, 4:18 PM GMT-10 (02:18 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.7 Kodiak Island region, 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
4.5 (mb), light
Local time
UTC
1978-04-18 02:18:08 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
56.374° N, 152.845° 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.

Depth from
OPERATOR_ASSIGNED
Stations used
43

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 4.7Kodiak Island region, Alaska · 17685 days ago · 33 km deep · 12 km away
  2. 4.778 km SSE of Old Harbor, Alaska · 17680 days ago · 33 km deep · 23 km away
  3. 4.7104 km SSE of Old Harbor, Alaska · 17656 days ago · 33 km deep · 16 km away

Before

  1. 4.968 km SSE of Old Harbor, Alaska · 17691 days ago · 24 km deep · 33 km away
  2. 4.397 km SSE of Old Harbor, Alaska · 17693 days ago · 33 km deep · 1 km away
  3. 4.5134 km SSE of Old Harbor, Alaska · 17694 days ago · 33 km deep · 47 km away
  4. 3.5172 km SSE of Old Harbor, Alaska · 17695 days ago · 33 km deep · 81 km away
  5. 5.175 km SSE of Old Harbor, Alaska · 17695 days ago · 27 km deep · 22 km away
  6. 4.6103 km SSE of Old Harbor, Alaska · 17695 days ago · 19 km deep · 19 km away
  7. 5.193 km SSE of Old Harbor, Alaska · 17695 days ago · 24 km deep · 19 km away
  8. 4.6105 km SSE of Old Harbor, Alaska · 17695 days ago · 15 km deep · 18 km away
  9. 4.776 km SSE of Old Harbor, Alaska · 17695 days ago · 16 km deep · 31 km away
  10. 4.791 km SSE of Old Harbor, Alaska · 17695 days ago · 33 km deep · 24 km away
  11. 5.239 km SE of Akhiok, Alaska · 17695 days ago · 23 km deep · 63 km away
  12. 6.694 km SSE of Old Harbor, Alaska · 17695 days ago · 14 km deep · 11 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000u55. Read Tue, Sep 22, 2026, 8:44 AM UTC.