Chagos-Laccadive Ridge

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The Chagos-Laccadive Ridge on the upper left side and the Ninety East Ridge at the centre of the picture

The Chagos-Laccadive Ridge (CLR), also known as Chagos-Laccadive Plateau,[1] is a prominent volcanic ridge and oceanic plateau extending between the Northern and the Central Indian Ocean. The CLR extends northward for approximately 2350 km from 9°S at the southern end of the Chagos Archipelago to 14° north around the Adas Bank. The islands of Chagos, the Maldives and Lakshadweep are the above-water parts of the Chagos-Laccadive Ridge.[2]

The vast Chagos-Laccadive Ridge was formed by the Réunion volcanic hotspot along with the southern part of the Mascarene Plateau. Both plateaux are volcanic traces of the Réunion hotspot.[3] Although the Chagos-Laccadive Ridge is an aseismic ridge, between 1965 and 1970 an unusual, isolated swarm of earthquakes occurred on the west side of the Great Chagos Bank at approximately 6°00′S 71°20′E / 6.000°S 71.333°E / -6.000; 71.333.[4]

See also[edit]


  1. ^ Chagos-Laccadive Plateau: Undersea Features - National Geospatial-Intelligence Agency
  2. ^ R. Mukhopadhyay, A.K. Ghosh and S.D. Iyer , The Indian Ocean nodule field: geology and resource potential By Ranadhir Mukhopadhyay, 2007 ISBN 978-0-444-52959-6
  3. ^ E. V. Verzhbitsky (2003). "Geothermal regime and genesis of the Ninety-East and Chagos-Laccadive ridges". Journal of Geodynamics. 35 (3): 289. Bibcode:2003JGeo...35..289V. doi:10.1016/S0264-3707(02)00068-6. 
  4. ^ Stein Seth (1978). "An earthquake swarm on the Chagos?Laccadive Ridge and its tectonic implications". Geophysical Journal International. 55 (3): 577–588. doi:10.1111/j.1365-246X.1978.tb05928.x. 

External links[edit]

Coordinates: 3°48′N 73°24′E / 3.800°N 73.400°E / 3.800; 73.400