Alaska earthquakes

M4.7 earthquake 54 km SE of Atka, Alaska

A magnitude 4.7 earthquake struck 54 km SE of Atka, Alaska on Sun, Apr 5, 1987, 2:38 PM HADT (23:38 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M4.8 94 km SSE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.7 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1987-04-05 23:38:14 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.863° N, 173.613° 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 1.7 and up: 4 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 4.764 km SE of Atka, Alaska · 14427 days ago · 33 km deep · 10 km away
  2. 4.894 km SSE of Atka, Alaska · 14427 days ago · 33 km deep · 46 km away
  3. 4.062 km SE of Atka, Alaska · 14427 days ago · 33 km deep · 10 km away
  4. 4.695 km ESE of Atka, Alaska · 14392 days ago · 33 km deep · 43 km away

Before

  1. 5.0Andreanof Islands, Aleutian Islands, Alaska · 14435 days ago · 33 km deep · 42 km away
  2. 4.697 km SE of Atka, Alaska · 14435 days ago · 33 km deep · 43 km away
  3. 4.786 km SSE of Atka, Alaska · 14439 days ago · 33 km deep · 36 km away
  4. 4.053 km SE of Atka, Alaska · 14441 days ago · 33 km deep · 6 km away
  5. 4.876 km SE of Atka, Alaska · 14441 days ago · 33 km deep · 23 km away
  6. 4.561 km SSE of Atka, Alaska · 14442 days ago · 33 km deep · 18 km away
  7. 4.675 km SE of Atka, Alaska · 14442 days ago · 33 km deep · 23 km away
  8. 6.279 km SSE of Atka, Alaska · 14442 days ago · 20 km deep · 30 km away
  9. 5.184 km SE of Atka, Alaska · 14449 days ago · 33 km deep · 32 km away
  10. 4.880 km S of Atka, Alaska · 14457 days ago · 33 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00033y4. Read Sun, Oct 4, 2026, 8:50 PM UTC.