Alaska earthquakes

M4.8 earthquake 76 km SE of Atka, Alaska

A magnitude 4.8 earthquake struck 76 km SE of Atka, Alaska on Sun, Mar 22, 1987, 12:04 AM HAST (10:04 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
4.8 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1987-03-22 10:04:51 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.678° N, 173.460° 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 1.8 and up: 9 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.053 km SE of Atka, Alaska · 14440 days ago · 33 km deep · 28 km away
  2. 4.786 km SSE of Atka, Alaska · 14437 days ago · 33 km deep · 15 km away
  3. 4.697 km SE of Atka, Alaska · 14434 days ago · 33 km deep · 20 km away
  4. 5.0Andreanof Islands, Aleutian Islands, Alaska · 14434 days ago · 33 km deep · 21 km away
  5. 4.754 km SE of Atka, Alaska · 14426 days ago · 33 km deep · 23 km away
  6. 4.764 km SE of Atka, Alaska · 14426 days ago · 33 km deep · 13 km away
  7. 4.894 km SSE of Atka, Alaska · 14426 days ago · 33 km deep · 26 km away
  8. 4.062 km SE of Atka, Alaska · 14426 days ago · 33 km deep · 14 km away
  9. 4.695 km ESE of Atka, Alaska · 14390 days ago · 33 km deep · 32 km away

Before

  1. 4.561 km SSE of Atka, Alaska · 14440 days ago · 33 km deep · 20 km away
  2. 4.675 km SE of Atka, Alaska · 14441 days ago · 33 km deep · 3 km away
  3. 6.279 km SSE of Atka, Alaska · 14441 days ago · 20 km deep · 12 km away
  4. 5.184 km SE of Atka, Alaska · 14448 days ago · 33 km deep · 9 km away
  5. 4.880 km S of Atka, Alaska · 14455 days ago · 33 km deep · 53 km away
  6. 5.094 km SSW of Atka, Alaska · 14466 days ago · 33 km deep · 97 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00033hm. Read Sat, Oct 3, 2026, 3:11 PM UTC.