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Map of the Indian Ocean

Set of 2 sheets: 1- Physiography,  2- Structural Map
Mercator projection
First edition published in 2004 at the scale of 1:20 000 000
Reprint 2013 at the scale of 1:40 000 000
Size: 59,4 cm x 42 cm each

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Enveloppe (ex: folded map or booklet)
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10,00 € per set

The two sheets (1- Physiography; 2- Structural Map) of this map are the first of the series of a new CGMW cartographic program devoted to the oceans of the World. The Indian Ocean map displays the main morphological and structural features of this region, covering both onshore and offshore areas and integrating the most recent data provided by marine magnetic profiling and global satellite altimetry.

The Physiographic map with its "fine grained" computer-generated image of the emerged and submarine morphology (complemented by the drawing of selected isobaths: -200 m, -1000 m, and then every 1000 m) is of great informational and esthetic value. It shows also the 300 or so active or Holocene volcanoes, and some 40 meteoritic impact craters.

The Structural Map represents, onshore, simplified geological features: Archean, Proterozoic, Phanerozoic basins; Paleozoic, Mesozoic, and Cenozoic orogenies; major faults, strike-slip movements, frontal thrusts. Due to its huge ice-cap, the Antarctica continent receives a specific cartographic treatment. Offshore, accent is placed on the structuration of the oceanic crust: chronostratigraphic ages, spreading axes, transform faults, subduction zones, anomalous reliefs (aseismic ridges, oceanic plateaus, …). In addition, are shown: the location (picks) of the discrete standard magnetic anomalies (chron), the divergence and convergence vectors, the thickness of the sediments overlying the oceanic basement, and the zone of compressional stress experienced by the oceanic crust between India and Australia.

Earthquakes (magnitude = 5.0) are plotted, onshore and offshore, with different size and coulours depending on their magnitude and focal depth.

A geodynamic sketch presents an overview of the plate tectonic pattern of the whole area and, particularly, the imprint of the Reunion hotspot on the overriding lithosphere since ca. 65 Ma, age of the outpour of the Deccan traps. As the first edition of the maps was exhausted, a reduced version of the maps at the scale of 1:40 000 000 was release in October 2013 in replacement of the original one.

Download the Explanatory notes here

  • Length 42 cm
  • Width 59,4 cm
  • Weight 0.080 kg
  • Scale 1:40 000 000