Alaska earthquakes

M4.6 earthquake 75 km SE of Atka, Alaska

A magnitude 4.6 earthquake struck 75 km SE of Atka, Alaska on Sat, Mar 21, 1987, 4:57 PM HAST (02:57 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
4.6 (mb, body-wave), light
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1987-03-22 02:57:51 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.668° N, 173.504° 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 1.6 and up: 11 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 4.561 km SSE of Atka, Alaska · 14442 days ago · 33 km deep · 17 km away
  2. 4.876 km SE of Atka, Alaska · 14442 days ago · 33 km deep · 3 km away
  3. 4.053 km SE of Atka, Alaska · 14442 days ago · 33 km deep · 28 km away
  4. 4.786 km SSE of Atka, Alaska · 14439 days ago · 33 km deep · 13 km away
  5. 4.697 km SE of Atka, Alaska · 14435 days ago · 33 km deep · 22 km away
  6. 5.0Andreanof Islands, Aleutian Islands, Alaska · 14435 days ago · 33 km deep · 24 km away
  7. 4.754 km SE of Atka, Alaska · 14427 days ago · 33 km deep · 23 km away
  8. 4.764 km SE of Atka, Alaska · 14427 days ago · 33 km deep · 14 km away
  9. 4.894 km SSE of Atka, Alaska · 14427 days ago · 33 km deep · 25 km away
  10. 4.062 km SE of Atka, Alaska · 14427 days ago · 33 km deep · 14 km away
  11. 4.695 km ESE of Atka, Alaska · 14392 days ago · 33 km deep · 35 km away

Before

  1. 6.279 km SSE of Atka, Alaska · 14442 days ago · 20 km deep · 10 km away
  2. 5.184 km SE of Atka, Alaska · 14450 days ago · 33 km deep · 9 km away
  3. 4.880 km S of Atka, Alaska · 14457 days ago · 33 km deep · 50 km away
  4. 5.094 km SSW of Atka, Alaska · 14468 days ago · 33 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00033ha. Read Mon, Oct 5, 2026, 3:24 AM UTC.