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Ninetyeast Ridge
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World map highlighting major features of the ocean basins, including trenches, ridges, basins, and plateaus labeled throughout the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. Continents are shown with shaded terrain, and prominent undersea features such as the Mid-Atlantic Ridge, Mariana Trench, and Kerguelen Plateau are marked across the map.
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Ninetyeast Ridge

aseismic ridge, Indian Ocean
Also known as: East Indian Ridge
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World map highlighting major features of the ocean basins, including trenches, ridges, basins, and plateaus labeled throughout the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. Continents are shown with shaded terrain, and prominent undersea features such as the Mid-Atlantic Ridge, Mariana Trench, and Kerguelen Plateau are marked across the map.
Major features of the ocean basins Major features of the ocean basins.

The Ninetyeast Ridge is a significant geological feature in the Indian Ocean, notable for being the world's longest and straightest aseismic ridge. It runs north along the 90° E meridian for approximately 4,500 kilometers (2,800 miles). Unlike oceanic ridges, aseismic ridges are virtually free of earthquakes.12

The Ninetyeast Ridge is believed to have formed from volcanic activity originating from a hot spot, now located near the Kerguelen Islands. It is composed of coalescing volcanoes and seamounts. As the Indian Plate moved over this hot spot, the ridge formed and then subsided.2

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2 Britannica Sources
  1. Indian Ocean - Oceanic ridges and fracture zones
  2. aseismic ridge

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