Alaska earthquakes

M4.5 earthquake 106 km ESE of Adak, Alaska

A magnitude 4.5 earthquake struck 106 km ESE of Adak, Alaska on Wed, Feb 25, 1987, 9:34 PM HAST (07:34 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.1 26 km E of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.5 (mb), light
Local time
UTC
1987-02-26 07:34:18 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.459° N, 175.241° 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 2 in the 30 days before it.

After

  1. 4.880 km S of Atka, Alaska · 14451 days ago · 33 km deep · 76 km away
  2. 5.091 km SW of Atka, Alaska · 14448 days ago · 33 km deep · 22 km away
  3. 4.846 km SSE of Adak, Alaska · 14445 days ago · 33 km deep · 75 km away
  4. 5.126 km E of Adak, Alaska · 14421 days ago · 65 km deep · 85 km away
  5. 4.767 km SE of Adak, Alaska · 14418 days ago · 33 km deep · 52 km away
  6. 4.463 km E of Adak, Alaska · 14410 days ago · 33 km deep · 53 km away

Before

  1. 5.094 km SSW of Atka, Alaska · 14462 days ago · 33 km deep · 30 km away
  2. 4.781 km WSW of Atka, Alaska · 14467 days ago · 33 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00032su. Read Tue, Sep 29, 2026, 7:40 AM UTC.