Alaska earthquakes

M4.7 earthquake 63 km SW of Unalaska, Alaska

A magnitude 4.7 earthquake struck 63 km SW of Unalaska, Alaska on Thu, Jul 31, 1986, 11:13 AM AKDT (19:13 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.8 57 km SE of Unalaska, 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
4.7 (mb), light
Local time
UTC
1986-07-31 19:13:31 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
53.443° N, 167.171° 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

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.7 and up: 7 in the 60 days after this one and 19 in the 30 days before it.

After

  1. 4.662 km SW of Unalaska, Alaska · 14663 days ago · 33 km deep · 7 km away
  2. 4.347 km ESE of Nikolski, Alaska · 14662 days ago · 33 km deep · 99 km away
  3. 4.6105 km S of Unalaska, Alaska · 14659 days ago · 33 km deep · 65 km away
  4. 4.560 km WSW of Unalaska, Alaska · 14656 days ago · 33 km deep · 19 km away
  5. 4.857 km SE of Unalaska, Alaska · 14641 days ago · 33 km deep · 88 km away
  6. 4.560 km SW of Unalaska, Alaska · 14630 days ago · 33 km deep · 4 km away
  7. 4.657 km SW of Unalaska, Alaska · 14613 days ago · 33 km deep · 16 km away

Before

  1. 5.0112 km S of Unalaska, Alaska · 14667 days ago · 33 km deep · 75 km away
  2. 4.779 km SSW of Unalaska, Alaska · 14669 days ago · 33 km deep · 18 km away
  3. 4.3Fox Islands, Aleutian Islands, Alaska · 14671 days ago · 33 km deep · 39 km away
  4. 4.586 km ENE of Nikolski, Alaska · 14673 days ago · 33 km deep · 42 km away
  5. 4.350 km SSW of Unalaska, Alaska · 14675 days ago · 33 km deep · 16 km away
  6. 4.463 km SW of Unalaska, Alaska · 14675 days ago · 33 km deep · 1 km away
  7. 5.1Fox Islands, Aleutian Islands, Alaska · 14675 days ago · 33 km deep · 15 km away
  8. 6.064 km SW of Unalaska, Alaska · 14675 days ago · 33 km deep · 12 km away
  9. 4.948 km WSW of Unalaska, Alaska · 14676 days ago · 33 km deep · 24 km away
  10. 4.463 km SW of Unalaska, Alaska · 14676 days ago · 33 km deep · 8 km away
  11. 5.064 km WSW of Unalaska, Alaska · 14676 days ago · 33 km deep · 25 km away
  12. 4.257 km SW of Unalaska, Alaska · 14676 days ago · 33 km deep · 9 km away
  13. 4.862 km SW of Unalaska, Alaska · 14676 days ago · 33 km deep · 9 km away
  14. 4.563 km SW of Unalaska, Alaska · 14676 days ago · 33 km deep · 7 km away
  15. 6.051 km SW of Unalaska, Alaska · 14676 days ago · 33 km deep · 17 km away
  16. 5.274 km SE of Unalaska, Alaska · 14676 days ago · 33 km deep · 88 km away
  17. 5.672 km SE of Unalaska, Alaska · 14676 days ago · 33 km deep · 86 km away
  18. 4.458 km WSW of Unalaska, Alaska · 14676 days ago · 33 km deep · 19 km away
  19. 4.657 km WSW of Unalaska, Alaska · 14676 days ago · 33 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002ws2. Read Wed, Sep 23, 2026, 8:33 AM UTC.