Alaska earthquakes

M4.1 earthquake 108 km SE of Adak, Alaska

A magnitude 4.1 earthquake struck 108 km SE of Adak, Alaska on Sat, Sep 27, 1986, 3:00 PM HADT (00:00 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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The earthquake

Magnitude
4.1 (mb), light
Local time
UTC
1986-09-28 00:00:01 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.282° N, 175.387° 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 1.5 and up: 20 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.199 km SW of Atka, Alaska · 14611 days ago · 33 km deep · 31 km away
  2. 5.0110 km SSW of Atka, Alaska · 14610 days ago · 33 km deep · 29 km away
  3. 5.445 km ESE of Adak, Alaska · 14608 days ago · 33 km deep · 68 km away
  4. 4.977 km SSE of Adak, Alaska · 14604 days ago · 33 km deep · 52 km away
  5. 5.225 km E of Adak, Alaska · 14603 days ago · 43 km deep · 88 km away
  6. 4.579 km SE of Adak, Alaska · 14603 days ago · 33 km deep · 30 km away
  7. 4.767 km SE of Adak, Alaska · 14602 days ago · 33 km deep · 41 km away
  8. 5.690 km SW of Atka, Alaska · 14592 days ago · 33 km deep · 50 km away
  9. 4.4136 km SE of Adak, Alaska · 14591 days ago · 33 km deep · 32 km away
  10. 4.697 km SSW of Atka, Alaska · 14589 days ago · 33 km deep · 46 km away
  11. 4.8120 km SSW of Atka, Alaska · 14589 days ago · 33 km deep · 47 km away
  12. 4.7102 km SSE of Adak, Alaska · 14585 days ago · 33 km deep · 43 km away
  13. 4.868 km SE of Adak, Alaska · 14578 days ago · 33 km deep · 40 km away
  14. 4.7174 km SSE of Adak, Alaska · 14572 days ago · 33 km deep · 80 km away
  15. 5.945 km S of Adak, Alaska · 14572 days ago · 33 km deep · 92 km away
  16. 4.864 km SSE of Adak, Alaska · 14572 days ago · 33 km deep · 73 km away
  17. 4.792 km S of Adak, Alaska · 14568 days ago · 33 km deep · 75 km away
  18. 4.991 km SSW of Atka, Alaska · 14567 days ago · 33 km deep · 46 km away
  19. 4.6116 km S of Atka, Alaska · 14567 days ago · 33 km deep · 83 km away
  20. 4.5103 km SSE of Adak, Alaska · 14559 days ago · 33 km deep · 51 km away

Before

  1. 4.488 km SW of Atka, Alaska · 14638 days ago · 33 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002yf6. Read Tue, Sep 29, 2026, 2:34 PM UTC.