Alaska earthquakes

M5.5 earthquake 70 km WSW of Adak, Alaska

A magnitude 5.5 earthquake struck 70 km WSW of Adak, Alaska on Sun, May 31, 1987, 3:15 PM HADT (00:15 UTC), 33 km (21 mi) below the surface.

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The earthquake

Magnitude
5.5 (mw), moderate
Local time
UTC
1987-06-01 00:15:14 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.540° N, 177.509° 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 2.5 and up: 11 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.982 km SW of Adak, Alaska · 14358 days ago · 33 km deep · 23 km away
  2. 5.036 km SE of Adak, Alaska · 14358 days ago · 58 km deep · 89 km away
  3. 4.561 km W of Adak, Alaska · 14341 days ago · 98 km deep · 48 km away
  4. 4.986 km S of Adak, Alaska · 14335 days ago · 33 km deep · 82 km away
  5. 4.588 km S of Adak, Alaska · 14335 days ago · 33 km deep · 84 km away
  6. 4.0100 km S of Adak, Alaska · 14328 days ago · 33 km deep · 95 km away
  7. 4.588 km S of Adak, Alaska · 14328 days ago · 33 km deep · 90 km away
  8. 4.784 km S of Adak, Alaska · 14328 days ago · 33 km deep · 86 km away
  9. 5.097 km S of Adak, Alaska · 14328 days ago · 33 km deep · 95 km away
  10. 4.583 km S of Adak, Alaska · 14328 days ago · 33 km deep · 82 km away
  11. 4.6145 km WSW of Adak, Alaska · 14324 days ago · 33 km deep · 75 km away

Before

  1. 4.760 km SE of Adak, Alaska · 14376 days ago · 33 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00035eb (also filed as gcmtb060187a, gcmt19870601001514, iscgem463308). Read Tue, Sep 22, 2026, 4:18 AM UTC.