Alaska earthquakes

M4.5 earthquake 88 km S of Adak, Alaska

A magnitude 4.5 earthquake struck 88 km S of Adak, Alaska on Tue, Jun 23, 1987, 6:37 PM HADT (03:37 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.7 84 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.5 (mb), light
Local time
UTC
1987-06-24 03:37:01 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.078° N, 176.547° 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 1.5 and up: 6 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.0100 km S of Adak, Alaska · 14329 days ago · 33 km deep · 12 km away
  2. 4.588 km S of Adak, Alaska · 14329 days ago · 33 km deep · 8 km away
  3. 4.784 km S of Adak, Alaska · 14329 days ago · 33 km deep · 8 km away
  4. 5.097 km S of Adak, Alaska · 14329 days ago · 33 km deep · 11 km away
  5. 4.583 km S of Adak, Alaska · 14328 days ago · 33 km deep · 6 km away
  6. 4.1110 km SSE of Adak, Alaska · 14307 days ago · 33 km deep · 42 km away

Before

  1. 4.986 km S of Adak, Alaska · 14335 days ago · 33 km deep · 3 km away
  2. 4.386 km SSE of Adak, Alaska · 14344 days ago · 33 km deep · 34 km away
  3. 5.036 km SE of Adak, Alaska · 14358 days ago · 58 km deep · 68 km away
  4. 4.982 km SW of Adak, Alaska · 14358 days ago · 33 km deep · 69 km away
  5. 5.570 km WSW of Adak, Alaska · 14358 days ago · 33 km deep · 84 km away
  6. 3.697 km SSE of Adak, Alaska · 14363 days ago · 33 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0003617. Read Tue, Sep 22, 2026, 8:21 AM UTC.