Alaska earthquakes

M4.0 earthquake 53 km SE of Atka, Alaska

A magnitude 4.0 earthquake struck 53 km SE of Atka, Alaska on Sun, Mar 22, 1987, 1:16 AM HAST (11:16 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.0 Andreanof Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude
4.0 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1987-03-22 11:16:49 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.916° N, 173.574° 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: 8 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.786 km SSE of Atka, Alaska · 14437 days ago · 33 km deep · 41 km away
  2. 4.697 km SE of Atka, Alaska · 14433 days ago · 33 km deep · 46 km away
  3. 5.0Andreanof Islands, Aleutian Islands, Alaska · 14433 days ago · 33 km deep · 44 km away
  4. 4.754 km SE of Atka, Alaska · 14425 days ago · 33 km deep · 6 km away
  5. 4.764 km SE of Atka, Alaska · 14425 days ago · 33 km deep · 14 km away
  6. 4.894 km SSE of Atka, Alaska · 14425 days ago · 33 km deep · 52 km away
  7. 4.062 km SE of Atka, Alaska · 14425 days ago · 33 km deep · 16 km away
  8. 4.695 km ESE of Atka, Alaska · 14390 days ago · 33 km deep · 42 km away

Before

  1. 4.876 km SE of Atka, Alaska · 14440 days ago · 33 km deep · 28 km away
  2. 4.561 km SSE of Atka, Alaska · 14440 days ago · 33 km deep · 25 km away
  3. 4.675 km SE of Atka, Alaska · 14440 days ago · 33 km deep · 28 km away
  4. 6.279 km SSE of Atka, Alaska · 14440 days ago · 20 km deep · 36 km away
  5. 5.184 km SE of Atka, Alaska · 14448 days ago · 33 km deep · 36 km away
  6. 4.880 km S of Atka, Alaska · 14455 days ago · 33 km deep · 64 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00033hp. Read Fri, Oct 2, 2026, 9:38 PM UTC.