Alaska earthquakes

M4.9 earthquake 87 km S of Adak, Alaska

A magnitude 4.9 earthquake struck 87 km S of Adak, Alaska on Sun, Aug 3, 1986, 11:08 AM HADT (20:08 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.4 45 km ESE of Adak, Alaska. This one was a foreshock.

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

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The earthquake

Magnitude
4.9 (ms), light
Local time
UTC
1986-08-03 20:08:20 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.092° N, 176.707° 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

Nearby

Within 100 km, magnitude 1.9 and up: 7 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 4.780 km S of Adak, Alaska · 14665 days ago · 33 km deep · 6 km away
  2. 4.237 km E of Adak, Alaska · 14650 days ago · 33 km deep · 93 km away
  3. 4.364 km ESE of Adak, Alaska · 14648 days ago · 33 km deep · 94 km away
  4. 4.946 km SW of Adak, Alaska · 14623 days ago · 33 km deep · 58 km away
  5. 4.594 km SSW of Adak, Alaska · 14620 days ago · 33 km deep · 18 km away
  6. 4.1108 km SE of Adak, Alaska · 14610 days ago · 33 km deep · 94 km away
  7. 5.445 km ESE of Adak, Alaska · 14607 days ago · 33 km deep · 90 km away

Before

  1. 4.784 km S of Adak, Alaska · 14666 days ago · 33 km deep · 2 km away
  2. 5.979 km S of Adak, Alaska · 14666 days ago · 33 km deep · 10 km away
  3. 5.076 km SE of Adak, Alaska · 14667 days ago · 33 km deep · 56 km away
  4. 4.354 km SSE of Adak, Alaska · 14667 days ago · 33 km deep · 50 km away
  5. 4.986 km SSE of Adak, Alaska · 14667 days ago · 33 km deep · 40 km away
  6. 4.883 km SSE of Adak, Alaska · 14667 days ago · 33 km deep · 37 km away
  7. 4.844 km E of Adak, Alaska · 14672 days ago · 33 km deep · 100 km away
  8. 4.497 km SSE of Adak, Alaska · 14673 days ago · 33 km deep · 40 km away
  9. 4.793 km SSE of Adak, Alaska · 14674 days ago · 33 km deep · 56 km away
  10. 5.683 km SSE of Adak, Alaska · 14675 days ago · 33 km deep · 49 km away
  11. 5.876 km SSE of Adak, Alaska · 14675 days ago · 33 km deep · 41 km away
  12. 4.952 km S of Adak, Alaska · 14676 days ago · 33 km deep · 34 km away
  13. 4.983 km SSE of Adak, Alaska · 14677 days ago · 33 km deep · 40 km away
  14. 5.257 km SSE of Adak, Alaska · 14677 days ago · 33 km deep · 52 km away
  15. 4.879 km SE of Adak, Alaska · 14678 days ago · 33 km deep · 80 km away
  16. 5.026 km SW of Adak, Alaska · 14690 days ago · 57 km deep · 67 km away
  17. 5.527 km E of Adak, Alaska · 14691 days ago · 50 km deep · 96 km away
  18. 4.569 km SE of Adak, Alaska · 14693 days ago · 33 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002wut. Read Mon, Sep 28, 2026, 5:35 AM UTC.