Alaska earthquakes

M4.9 earthquake 77 km SSE of Adak, Alaska

A magnitude 4.9 earthquake struck 77 km SSE of Adak, Alaska on Sat, Oct 4, 1986, 6:25 PM HADT (03:25 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.9 45 km S 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 (mb), light
Local time
UTC
1986-10-05 03:25:57 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.252° N, 176.131° 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: 17 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 5.225 km E of Adak, Alaska · 14603 days ago · 43 km deep · 68 km away
  2. 4.579 km SE of Adak, Alaska · 14603 days ago · 33 km deep · 30 km away
  3. 4.767 km SE of Adak, Alaska · 14602 days ago · 33 km deep · 35 km away
  4. 5.690 km SW of Atka, Alaska · 14591 days ago · 33 km deep · 79 km away
  5. 4.4136 km SE of Adak, Alaska · 14591 days ago · 33 km deep · 67 km away
  6. 4.697 km SSW of Atka, Alaska · 14589 days ago · 33 km deep · 97 km away
  7. 4.8120 km SSW of Atka, Alaska · 14589 days ago · 33 km deep · 98 km away
  8. 5.254 km SSW of Adak, Alaska · 14585 days ago · 33 km deep · 53 km away
  9. 4.7102 km SSE of Adak, Alaska · 14584 days ago · 33 km deep · 25 km away
  10. 4.868 km SE of Adak, Alaska · 14578 days ago · 33 km deep · 37 km away
  11. 4.7174 km SSE of Adak, Alaska · 14572 days ago · 33 km deep · 98 km away
  12. 5.945 km S of Adak, Alaska · 14571 days ago · 33 km deep · 45 km away
  13. 4.864 km SSE of Adak, Alaska · 14571 days ago · 33 km deep · 22 km away
  14. 4.792 km S of Adak, Alaska · 14568 days ago · 33 km deep · 29 km away
  15. 4.991 km SSW of Atka, Alaska · 14567 days ago · 33 km deep · 97 km away
  16. 4.5103 km SSE of Adak, Alaska · 14558 days ago · 33 km deep · 26 km away
  17. 4.670 km S of Adak, Alaska · 14545 days ago · 33 km deep · 22 km away

Before

  1. 5.445 km ESE of Adak, Alaska · 14607 days ago · 33 km deep · 58 km away
  2. 5.0110 km SSW of Atka, Alaska · 14610 days ago · 33 km deep · 81 km away
  3. 4.199 km SW of Atka, Alaska · 14611 days ago · 33 km deep · 73 km away
  4. 4.1108 km SE of Adak, Alaska · 14611 days ago · 33 km deep · 52 km away
  5. 4.594 km SSW of Adak, Alaska · 14621 days ago · 33 km deep · 62 km away
  6. 4.946 km SW of Adak, Alaska · 14624 days ago · 33 km deep · 75 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002ypm. Read Tue, Sep 29, 2026, 2:42 AM UTC.