Alaska earthquakes

M4.8 earthquake 88 km SSW of Atka, Alaska

A magnitude 4.8 earthquake struck 88 km SSW of Atka, Alaska on Thu, Jul 17, 1986, 9:37 AM HADT (18:37 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.5 88 km WSW of Atka, 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
4.8 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1986-07-17 18:37:20 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.439° N, 174.583° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

What happened

The USGS’s account of the effects of this earthquake.

Felt on Adak.

From the USGS event page for usp0002w44. U.S. Geological Survey text and figures are in the public domain.

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 1.8 and up: 21 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 4.0101 km SW of Atka, Alaska · 14684 days ago · 33 km deep · 40 km away
  2. 4.631 km SW of Atka, Alaska · 14683 days ago · 33 km deep · 65 km away
  3. 4.879 km SE of Adak, Alaska · 14682 days ago · 33 km deep · 78 km away
  4. 4.993 km SW of Atka, Alaska · 14679 days ago · 33 km deep · 53 km away
  5. 4.669 km ESE of Adak, Alaska · 14679 days ago · 33 km deep · 81 km away
  6. 4.793 km SSE of Adak, Alaska · 14678 days ago · 33 km deep · 98 km away
  7. 5.4Andreanof Islands, Aleutian Islands, Alaska · 14676 days ago · 33 km deep · 38 km away
  8. 5.588 km WSW of Atka, Alaska · 14675 days ago · 33 km deep · 62 km away
  9. 4.785 km SW of Atka, Alaska · 14675 days ago · 33 km deep · 55 km away
  10. 4.4Andreanof Islands, Aleutian Islands, Alaska · 14675 days ago · 33 km deep · 63 km away
  11. 5.492 km S of Atka, Alaska · 14671 days ago · 33 km deep · 22 km away
  12. 4.889 km S of Atka, Alaska · 14671 days ago · 33 km deep · 24 km away
  13. 4.986 km S of Atka, Alaska · 14671 days ago · 33 km deep · 26 km away
  14. 4.571 km S of Atka, Alaska · 14671 days ago · 33 km deep · 32 km away
  15. 5.076 km SE of Adak, Alaska · 14671 days ago · 33 km deep · 99 km away
  16. 4.795 km SSW of Atka, Alaska · 14670 days ago · 33 km deep · 13 km away
  17. 5.087 km S of Atka, Alaska · 14670 days ago · 33 km deep · 29 km away
  18. 4.3Andreanof Islands, Aleutian Islands, Alaska · 14663 days ago · 33 km deep · 16 km away
  19. 4.888 km SW of Atka, Alaska · 14658 days ago · 33 km deep · 49 km away
  20. 4.364 km ESE of Adak, Alaska · 14652 days ago · 33 km deep · 85 km away
  21. 4.488 km SW of Atka, Alaska · 14640 days ago · 33 km deep · 48 km away

Before

  1. 4.5Andreanof Islands, Aleutian Islands, Alaska · 14695 days ago · 33 km deep · 40 km away
  2. 4.569 km SE of Adak, Alaska · 14697 days ago · 33 km deep · 100 km away
  3. 4.975 km ESE of Adak, Alaska · 14700 days ago · 33 km deep · 79 km away
  4. 5.063 km SE of Adak, Alaska · 14700 days ago · 33 km deep · 94 km away
  5. 4.455 km SE of Adak, Alaska · 14704 days ago · 33 km deep · 98 km away
  6. 4.743 km W of Atka, Alaska · 14705 days ago · 33 km deep · 92 km away
  7. 4.383 km SW of Atka, Alaska · 14711 days ago · 33 km deep · 48 km away
  8. 4.6101 km SE of Adak, Alaska · 14711 days ago · 33 km deep · 77 km away
  9. 4.4109 km SW of Atka, Alaska · 14711 days ago · 33 km deep · 43 km away
  10. 4.2118 km SSW of Atka, Alaska · 14712 days ago · 33 km deep · 41 km away
  11. 4.665 km WSW of Atka, Alaska · 14712 days ago · 33 km deep · 80 km away
  12. 4.887 km SW of Atka, Alaska · 14712 days ago · 33 km deep · 50 km away
  13. 4.4135 km SE of Adak, Alaska · 14712 days ago · 33 km deep · 56 km away
  14. 5.4125 km SE of Adak, Alaska · 14712 days ago · 33 km deep · 48 km away
  15. 4.7100 km SSW of Atka, Alaska · 14712 days ago · 33 km deep · 17 km away
  16. 4.576 km SE of Adak, Alaska · 14712 days ago · 33 km deep · 90 km away
  17. 4.271 km SE of Adak, Alaska · 14715 days ago · 33 km deep · 95 km away
  18. 4.980 km SSE of Atka, Alaska · 14716 days ago · 33 km deep · 52 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002w44. Read Fri, Oct 2, 2026, 12:26 AM UTC.