Alaska earthquakes

M5.1 earthquake 84 km SE of Atka, Alaska

A magnitude 5.1 earthquake struck 84 km SE of Atka, Alaska on Fri, Mar 13, 1987, 11:23 PM HAST (09:23 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M6.2 79 km SSE of Atka, Alaska. This one was a foreshock.

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The earthquake

Magnitude
5.1 (mb, body-wave), moderate
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
1987-03-14 09:23:58 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
51.598° N, 173.444° 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 2.1 and up: 14 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 6.279 km SSE of Atka, Alaska · 14439 days ago · 20 km deep · 9 km away
  2. 4.675 km SE of Atka, Alaska · 14439 days ago · 33 km deep · 9 km away
  3. 4.561 km SSE of Atka, Alaska · 14439 days ago · 33 km deep · 25 km away
  4. 4.876 km SE of Atka, Alaska · 14439 days ago · 33 km deep · 9 km away
  5. 4.053 km SE of Atka, Alaska · 14439 days ago · 33 km deep · 36 km away
  6. 4.786 km SSE of Atka, Alaska · 14436 days ago · 33 km deep · 7 km away
  7. 4.697 km SE of Atka, Alaska · 14432 days ago · 33 km deep · 14 km away
  8. 5.0Andreanof Islands, Aleutian Islands, Alaska · 14432 days ago · 33 km deep · 19 km away
  9. 4.754 km SE of Atka, Alaska · 14424 days ago · 33 km deep · 32 km away
  10. 4.764 km SE of Atka, Alaska · 14424 days ago · 33 km deep · 22 km away
  11. 4.894 km SSE of Atka, Alaska · 14424 days ago · 33 km deep · 19 km away
  12. 4.062 km SE of Atka, Alaska · 14424 days ago · 33 km deep · 22 km away
  13. 4.5179 km SSE of Atka, Alaska · 14424 days ago · 33 km deep · 97 km away
  14. 4.695 km ESE of Atka, Alaska · 14389 days ago · 33 km deep · 34 km away

Before

  1. 4.880 km S of Atka, Alaska · 14454 days ago · 33 km deep · 51 km away
  2. 5.094 km SSW of Atka, Alaska · 14465 days ago · 33 km deep · 96 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00033a4. Read Fri, Oct 2, 2026, 5:31 AM UTC.