Alaska earthquakes

M4.1 earthquake 99 km SW of Atka, Alaska

A magnitude 4.1 earthquake struck 99 km SW of Atka, Alaska on Sun, Sep 28, 1986, 2:23 AM HADT (11:23 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 110 km SSW of Atka, 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
4.1 (mb), light
Local time
UTC
1986-09-28 11:23:43 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.532° N, 175.175° 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: 18 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 5.0110 km SSW of Atka, Alaska · 14604 days ago · 33 km deep · 27 km away
  2. 5.445 km ESE of Adak, Alaska · 14601 days ago · 33 km deep · 62 km away
  3. 4.977 km SSE of Adak, Alaska · 14598 days ago · 33 km deep · 73 km away
  4. 5.225 km E of Adak, Alaska · 14597 days ago · 43 km deep · 83 km away
  5. 4.579 km SE of Adak, Alaska · 14597 days ago · 33 km deep · 44 km away
  6. 4.767 km SE of Adak, Alaska · 14596 days ago · 33 km deep · 47 km away
  7. 5.690 km SW of Atka, Alaska · 14585 days ago · 33 km deep · 23 km away
  8. 4.4136 km SE of Adak, Alaska · 14585 days ago · 33 km deep · 59 km away
  9. 4.697 km SSW of Atka, Alaska · 14583 days ago · 33 km deep · 33 km away
  10. 4.8120 km SSW of Atka, Alaska · 14583 days ago · 33 km deep · 51 km away
  11. 4.7102 km SSE of Adak, Alaska · 14578 days ago · 33 km deep · 72 km away
  12. 4.868 km SE of Adak, Alaska · 14572 days ago · 33 km deep · 45 km away
  13. 4.864 km SSE of Adak, Alaska · 14565 days ago · 33 km deep · 91 km away
  14. 4.792 km S of Adak, Alaska · 14562 days ago · 33 km deep · 100 km away
  15. 4.991 km SSW of Atka, Alaska · 14561 days ago · 33 km deep · 29 km away
  16. 4.6116 km S of Atka, Alaska · 14560 days ago · 33 km deep · 79 km away
  17. 5.589 km SSE of Atka, Alaska · 14557 days ago · 33 km deep · 95 km away
  18. 4.5103 km SSE of Adak, Alaska · 14552 days ago · 33 km deep · 80 km away

Before

  1. 4.1108 km SE of Adak, Alaska · 14605 days ago · 33 km deep · 31 km away
  2. 4.488 km SW of Atka, Alaska · 14631 days ago · 33 km deep · 15 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002yfv. Read Wed, Sep 23, 2026, 3:22 AM UTC.