Southeast Indian Ridge

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Southeast Indian Ridge (yellow line)

The Southeast Indian Ridge (SEIR) is a divergent tectonic plate boundary located along the seafloor of the southern Indian Ocean. It separates the Indo-Australian Plate to the north from the Antarctic Plate to the south.[1][2][3][4]

The SEIR extends from the Rodrigues Triple Point in the southern Indian Ocean, through the Southern Ocean south of the Australian continent, and on to the Macquarie Triple Junction in the southwest Pacific Ocean.

The islands of Saint-Paul and Amsterdam are the above-water points of the Southeast Indian Ridge.

The ridge lies north of the South Indian Basin.


  1. ^ Stow, D. A. V. (2006) Oceans : an illustrated reference Chicago : University of Chicago Press, ISBN 0-226-77664-6 - page 127 for map of Indian Ocean and ridges
  2. ^ Ma, L. Ying (2008), Crustal accretion at the intermediate spreading rate Southeast Indian Ridge, retrieved 24 February 2015 
  3. ^ Baran, Janet Maureen (2008), Linkage between crustal structure, mantle temperature and axial morphology : a study of the intermediate spreading Southeast Indian Ridge, retrieved 24 February 2015 
  4. ^ "Moderate quake hits southeast Indian Ridge", Xinhua News Agency (COMTEX News Network, Inc), 2013-06-28, retrieved 24 February 2015 

Coordinates: 25°30′00″S 70°00′00″E / 25.5000°S 70.0000°E / -25.5000; 70.0000