Alaska earthquakes

M4.5 earthquake 63 km SW of Unalaska, Alaska

A magnitude 4.5 earthquake struck 63 km SW of Unalaska, Alaska on Sat, Apr 11, 1987, 8:56 PM AKDT (04:56 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.7 31 km W of Dutch Harbor, 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
4.5 (mb), light
Local time
UTC
1987-04-12 04:56:50 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
53.536° N, 167.306° 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: 4 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 4.476 km SW of Unalaska, Alaska · 14413 days ago · 33 km deep · 14 km away
  2. 3.938 km WSW of Dutch Harbor, Alaska · 14402 days ago · 33 km deep · 33 km away
  3. 4.731 km W of Dutch Harbor, Alaska · 14371 days ago · 33 km deep · 40 km away
  4. 4.641 km WSW of Unalaska, Alaska · 14368 days ago · 33 km deep · 28 km away

Before

  1. 5.168 km SW of Unalaska, Alaska · 14416 days ago · 33 km deep · 16 km away
  2. 4.669 km SW of Unalaska, Alaska · 14420 days ago · 33 km deep · 6 km away
  3. 4.241 km SW of Unalaska, Alaska · 14427 days ago · 10 km deep · 25 km away
  4. 4.487 km SW of Unalaska, Alaska · 14434 days ago · 10 km deep · 35 km away
  5. 4.473 km WSW of Unalaska, Alaska · 14442 days ago · 10 km deep · 20 km away
  6. 5.474 km SW of Unalaska, Alaska · 14442 days ago · 10 km deep · 20 km away
  7. 4.391 km SSW of Unalaska, Alaska · 14444 days ago · 10 km deep · 47 km away
  8. 4.076 km SSW of Unalaska, Alaska · 14444 days ago · 10 km deep · 38 km away
  9. 4.685 km SSW of Unalaska, Alaska · 14445 days ago · 10 km deep · 36 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp000343p. Read Tue, Sep 29, 2026, 1:51 PM UTC.