Alaska earthquakes

M4.9 earthquake 82 km SW of Adak, Alaska

A magnitude 4.9 earthquake struck 82 km SW of Adak, Alaska on Sun, May 31, 1987, 3:55 PM HADT (00:55 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 36 km SE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.9 (mb), light
Local time
UTC
1987-06-01 00:55:40 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.337° N, 177.449° 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

Nearby

Within 100 km, magnitude 1.9 and up: 11 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 5.036 km SE of Adak, Alaska · 14358 days ago · 58 km deep · 91 km away
  2. 4.386 km SSE of Adak, Alaska · 14344 days ago · 33 km deep · 97 km away
  3. 4.561 km W of Adak, Alaska · 14342 days ago · 98 km deep · 70 km away
  4. 4.986 km S of Adak, Alaska · 14336 days ago · 33 km deep · 67 km away
  5. 4.588 km S of Adak, Alaska · 14336 days ago · 33 km deep · 69 km away
  6. 4.0100 km S of Adak, Alaska · 14329 days ago · 33 km deep · 79 km away
  7. 4.588 km S of Adak, Alaska · 14329 days ago · 33 km deep · 76 km away
  8. 4.784 km S of Adak, Alaska · 14329 days ago · 33 km deep · 73 km away
  9. 5.097 km S of Adak, Alaska · 14329 days ago · 33 km deep · 80 km away
  10. 4.583 km S of Adak, Alaska · 14329 days ago · 33 km deep · 68 km away
  11. 4.6145 km WSW of Adak, Alaska · 14324 days ago · 33 km deep · 73 km away

Before

  1. 5.570 km WSW of Adak, Alaska · 14359 days ago · 33 km deep · 23 km away
  2. 3.697 km SSE of Adak, Alaska · 14363 days ago · 33 km deep · 100 km away
  3. 4.581 km SSE of Adak, Alaska · 14367 days ago · 33 km deep · 96 km away
  4. 4.774 km SSE of Adak, Alaska · 14367 days ago · 33 km deep · 96 km away
  5. 4.760 km SE of Adak, Alaska · 14376 days ago · 33 km deep · 92 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00035ec. Read Tue, Sep 22, 2026, 4:09 PM UTC.