Alaska earthquakes

M4.2 earthquake 57 km SW of Unalaska, Alaska

A magnitude 4.2 earthquake struck 57 km SW of Unalaska, Alaska on Sat, Jul 19, 1986, 12:20 AM AKDT (08:20 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.0 64 km SW 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
4.2 (mb), light
Local time
UTC
1986-07-19 08:20:24 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
53.527° N, 167.170° 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 1.5 and up: 17 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 5.064 km WSW of Unalaska, Alaska · 14682 days ago · 33 km deep · 19 km away
  2. 4.463 km SW of Unalaska, Alaska · 14682 days ago · 33 km deep · 6 km away
  3. 4.948 km WSW of Unalaska, Alaska · 14681 days ago · 33 km deep · 15 km away
  4. 6.064 km SW of Unalaska, Alaska · 14681 days ago · 33 km deep · 9 km away
  5. 5.1Fox Islands, Aleutian Islands, Alaska · 14681 days ago · 33 km deep · 12 km away
  6. 4.463 km SW of Unalaska, Alaska · 14681 days ago · 33 km deep · 10 km away
  7. 4.350 km SSW of Unalaska, Alaska · 14681 days ago · 33 km deep · 15 km away
  8. 4.586 km ENE of Nikolski, Alaska · 14679 days ago · 33 km deep · 48 km away
  9. 4.3Fox Islands, Aleutian Islands, Alaska · 14677 days ago · 33 km deep · 43 km away
  10. 4.779 km SSW of Unalaska, Alaska · 14675 days ago · 33 km deep · 28 km away
  11. 5.0112 km S of Unalaska, Alaska · 14673 days ago · 33 km deep · 83 km away
  12. 4.763 km SW of Unalaska, Alaska · 14670 days ago · 33 km deep · 9 km away
  13. 4.662 km SW of Unalaska, Alaska · 14669 days ago · 33 km deep · 6 km away
  14. 4.6105 km S of Unalaska, Alaska · 14665 days ago · 33 km deep · 73 km away
  15. 4.560 km WSW of Unalaska, Alaska · 14662 days ago · 33 km deep · 12 km away
  16. 4.857 km SE of Unalaska, Alaska · 14647 days ago · 33 km deep · 87 km away
  17. 4.560 km SW of Unalaska, Alaska · 14636 days ago · 33 km deep · 7 km away

Before

  1. 4.862 km SW of Unalaska, Alaska · 14682 days ago · 33 km deep · 5 km away
  2. 4.563 km SW of Unalaska, Alaska · 14682 days ago · 33 km deep · 15 km away
  3. 6.051 km SW of Unalaska, Alaska · 14682 days ago · 33 km deep · 8 km away
  4. 5.274 km SE of Unalaska, Alaska · 14682 days ago · 33 km deep · 89 km away
  5. 5.672 km SE of Unalaska, Alaska · 14682 days ago · 33 km deep · 88 km away
  6. 4.458 km WSW of Unalaska, Alaska · 14682 days ago · 33 km deep · 12 km away
  7. 4.657 km WSW of Unalaska, Alaska · 14682 days ago · 33 km deep · 11 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002w5v. Read Tue, Sep 29, 2026, 7:01 AM UTC.