Informatics Publishing Limited

K. R. Pillay ¹, P. Durgaprasad ¹, B. Gopakumar ¹, Raja Mukhopadhyay ¹, V. K. Saritha ¹, K. G. Mohan ¹, Subhradeep Das ¹, P. K. Mamatha ¹, Piyush Kumar ², D. Gajanan ², L. V. Kailash ¹, P. J. Ramesh ¹

Affiliations
1 Marine and Coastal Survey Division, Geological Survey of India, Mangalore 575 001, IN
2 Marine and Coastal Survey Division, Geological Survey of India, Gandhi Nagar 382 016, IN

Abstract

During the Cruise SR-004, taken up in August 2014 by RV Samudra Ratnakar of the Geological Survey of India, high resolution sea bed survey by swath bathymetry and sub-bottom profiling were carried out in the outer continental shelf off the Cochin coast, 65 km SW of Cochin, an isolated large circular depression was observed in an otherwise gently sloping (0.8) sea floor (Figure 1). Depth of the outer shelf in the eastern part of the depression is 155 m and 160 m on the western side. Part of a submarine channel has also been identified in the outer shelf and slope and indications of a few faults are seen in the vicinity of the shelf margin.

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Saju Varghese ¹, A. Anil Kumar ¹, G. Nagendran ¹, V. Balachandrudu ¹, Nilofer Sheikh ¹, K. G. Mohan ¹, Kailash Singh ¹, B. Gopakumar ¹, Rajesh Joshi ¹, R. Rajasekhar ¹

Affiliations
1 Marine & Coastal Survey Division, Geological Survey of India, Kolkata, IN

Abstract

Synthetic Aperture Sonar (SAS), modern technology for very high resolution seafloor mapping, when towed at 70-120 m above the seafloor generates high-quality backscatter image of the same with constant resolution of 40 cm x 40 cm. Research Vessel (RV) Samudra Ratnakar of the Geological Survey of India is equipped with Synthetic Aperture Mapping Sonar, SAMS DT-6000 (make: IXblue, France), the only one of its kind equipment in the world for civilian research purpose.

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