Alaska earthquakes

M4.3 earthquake 93 km ESE of Old Harbor, Alaska

A magnitude 4.3 earthquake struck 93 km ESE of Old Harbor, Alaska on Sun, Aug 4, 1974, 12:36 PM GMT-9 (21:36 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M5.3 86 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
4.3 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1974-08-04 21:36:16 UTC
Depth
40.0 km (24.9 mi), shallow
Epicenter
56.755° N, 152.009° 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
33

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 21 in the 30 days before it.

After

  1. 4.788 km SE of Old Harbor, Alaska · 19051 days ago · 16 km deep · 36 km away
  2. 4.676 km SE of Old Harbor, Alaska · 19051 days ago · 33 km deep · 25 km away
  3. 4.676 km SE of Old Harbor, Alaska · 19050 days ago · 32 km deep · 18 km away
  4. 5.386 km SE of Old Harbor, Alaska · 19050 days ago · 33 km deep · 22 km away
  5. 3.969 km SE of Old Harbor, Alaska · 19050 days ago · 67 km deep · 24 km away
  6. 4.675 km SE of Old Harbor, Alaska · 19050 days ago · 33 km deep · 23 km away
  7. 4.585 km ESE of Old Harbor, Alaska · 19050 days ago · 33 km deep · 8 km away
  8. 5.1105 km SSE of Chiniak, Alaska · 19010 days ago · 17 km deep · 22 km away

Before

  1. 4.1102 km SE of Old Harbor, Alaska · 19054 days ago · 33 km deep · 25 km away
  2. 4.193 km SE of Old Harbor, Alaska · 19055 days ago · 36 km deep · 23 km away
  3. 4.058 km S of Chiniak, Alaska · 19055 days ago · 64 km deep · 41 km away
  4. 4.081 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 14 km away
  5. 3.893 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 8 km away
  6. 3.993 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 16 km away
  7. 4.192 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 12 km away
  8. 6.089 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 21 km away
  9. 3.899 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 6 km away
  10. 4.2101 km SE of Old Harbor, Alaska · 19056 days ago · 16 km deep · 18 km away
  11. 3.9101 km SSE of Chiniak, Alaska · 19056 days ago · 33 km deep · 10 km away
  12. 4.397 km SE of Old Harbor, Alaska · 19056 days ago · 15 km deep · 12 km away
  13. 4.486 km SE of Old Harbor, Alaska · 19056 days ago · 16 km deep · 12 km away
  14. 3.891 km SE of Old Harbor, Alaska · 19056 days ago · 27 km deep · 13 km away
  15. 4.386 km SE of Old Harbor, Alaska · 19056 days ago · 7 km deep · 14 km away
  16. 4.597 km SE of Old Harbor, Alaska · 19056 days ago · 19 km deep · 13 km away
  17. 3.898 km ESE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 5 km away
  18. 4.687 km SE of Old Harbor, Alaska · 19056 days ago · 15 km deep · 30 km away
  19. 6.394 km SE of Old Harbor, Alaska · 19056 days ago · 33 km deep · 11 km away
  20. 6.197 km SE of Old Harbor, Alaska · 19056 days ago · 10 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00007g8. Read Sat, Oct 3, 2026, 4:29 PM UTC.