Alaska earthquakes

M5.1 earthquake 68 km SW of Unalaska, Alaska

A magnitude 5.1 earthquake struck 68 km SW of Unalaska, Alaska on Sat, Apr 11, 1987, 8:22 AM AKDT (16:22 UTC), 33 km (21 mi) below the surface.

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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
5.1 (mb), moderate
Local time
UTC
1987-04-11 16:22:09 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
53.406° N, 167.213° 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 2.1 and up: 5 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 4.563 km SW of Unalaska, Alaska · 14408 days ago · 33 km deep · 16 km away
  2. 4.476 km SW of Unalaska, Alaska · 14406 days ago · 33 km deep · 15 km away
  3. 3.938 km WSW of Dutch Harbor, Alaska · 14395 days ago · 33 km deep · 45 km away
  4. 4.731 km W of Dutch Harbor, Alaska · 14364 days ago · 33 km deep · 51 km away
  5. 4.641 km WSW of Unalaska, Alaska · 14361 days ago · 33 km deep · 40 km away

Before

  1. 5.738 km ESE of Nikolski, Alaska · 14411 days ago · 33 km deep · 97 km away
  2. 4.669 km SW of Unalaska, Alaska · 14413 days ago · 33 km deep · 14 km away
  3. 4.846 km ESE of Nikolski, Alaska · 14418 days ago · 33 km deep · 95 km away
  4. 4.241 km SW of Unalaska, Alaska · 14420 days ago · 10 km deep · 28 km away
  5. 4.487 km SW of Unalaska, Alaska · 14427 days ago · 10 km deep · 21 km away
  6. 4.473 km WSW of Unalaska, Alaska · 14435 days ago · 10 km deep · 34 km away
  7. 5.474 km SW of Unalaska, Alaska · 14435 days ago · 10 km deep · 6 km away
  8. 4.391 km SSW of Unalaska, Alaska · 14437 days ago · 10 km deep · 32 km away
  9. 4.076 km SSW of Unalaska, Alaska · 14437 days ago · 10 km deep · 23 km away
  10. 4.685 km SSW of Unalaska, Alaska · 14438 days ago · 10 km deep · 21 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0003431. Read Tue, Sep 22, 2026, 10:41 AM UTC.