Alaska earthquakes

M3.9 earthquake 101 km SSE of Chiniak, Alaska

A magnitude 3.9 earthquake struck 101 km SSE of Chiniak, Alaska on Wed, Jul 31, 1974, 10:15 PM GMT-9 (07:15 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.2 101 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
3.9 (mb), minor
Local time
UTC
1974-08-01 07:15:02 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
56.734° N, 151.851° 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
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 4.2101 km SE of Old Harbor, Alaska · 19046 days ago · 16 km deep · 20 km away
  2. 3.899 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 6 km away
  3. 6.089 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 28 km away
  4. 4.192 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 19 km away
  5. 3.993 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 22 km away
  6. 3.893 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 15 km away
  7. 4.081 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 23 km away
  8. 4.058 km S of Chiniak, Alaska · 19045 days ago · 64 km deep · 48 km away
  9. 4.193 km SE of Old Harbor, Alaska · 19045 days ago · 36 km deep · 28 km away
  10. 4.1102 km SE of Old Harbor, Alaska · 19043 days ago · 33 km deep · 28 km away
  11. 4.393 km ESE of Old Harbor, Alaska · 19042 days ago · 40 km deep · 10 km away
  12. 4.788 km SE of Old Harbor, Alaska · 19041 days ago · 16 km deep · 43 km away
  13. 4.676 km SE of Old Harbor, Alaska · 19040 days ago · 33 km deep · 34 km away
  14. 4.676 km SE of Old Harbor, Alaska · 19040 days ago · 32 km deep · 28 km away
  15. 5.386 km SE of Old Harbor, Alaska · 19040 days ago · 33 km deep · 30 km away
  16. 3.969 km SE of Old Harbor, Alaska · 19040 days ago · 67 km deep · 34 km away
  17. 4.675 km SE of Old Harbor, Alaska · 19040 days ago · 33 km deep · 33 km away
  18. 4.585 km ESE of Old Harbor, Alaska · 19040 days ago · 33 km deep · 17 km away
  19. 5.1105 km SSE of Chiniak, Alaska · 18999 days ago · 17 km deep · 12 km away

Before

  1. 4.397 km SE of Old Harbor, Alaska · 19046 days ago · 15 km deep · 15 km away
  2. 4.486 km SE of Old Harbor, Alaska · 19046 days ago · 16 km deep · 21 km away
  3. 3.891 km SE of Old Harbor, Alaska · 19046 days ago · 27 km deep · 20 km away
  4. 4.386 km SE of Old Harbor, Alaska · 19046 days ago · 7 km deep · 22 km away
  5. 4.597 km SE of Old Harbor, Alaska · 19046 days ago · 19 km deep · 17 km away
  6. 3.898 km ESE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 5 km away
  7. 4.687 km SE of Old Harbor, Alaska · 19046 days ago · 15 km deep · 37 km away
  8. 6.394 km SE of Old Harbor, Alaska · 19046 days ago · 33 km deep · 17 km away
  9. 6.197 km SE of Old Harbor, Alaska · 19046 days ago · 10 km deep · 37 km away
  10. 4.690 km SE of Old Harbor, Alaska · 19046 days ago · 24 km deep · 15 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00007eb. Read Wed, Sep 23, 2026, 4:48 AM UTC.