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Side Scan Sonar Mapping Of Seafloor Depressions In The Abrolhos Shelf, Brazil

Daniel Andreas Klein, Alex Cardoso Bastos, Guilherme Dutra, Rodrigo L. Moura

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Abstract

Seafloor depressions have been mapped during side scan sonar surveys along the Abrolhos shelf, eastern brazilian coast. A total of 35 of these structures were mapped, showing circular or semicircular formats. They are found on depths from 26 to 64 meters, their diameter range from 17 to 55 meters, and their internal depth varies from 8 to 44 meters. Preliminary side scan and morphological results suggest that these features are pockmarks associated with hard carbonate beds.

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What this paper is about

Seafloor depressions have been mapped during side scan sonar surveys along the Abrolhos shelf, eastern brazilian coast. A total of 35 of these structures were mapped, showing circular or semicircular formats. They are found on depths from 26 to 64 meters, their diameter range from 17 to 55 meters, and their internal depth varies from 8 to 44 meters. Preliminary side scan and morphological results suggest that these features are pockmarks associated with hard carbonate beds.

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Available abstract

Seafloor depressions have been mapped during side scan sonar surveys along the Abrolhos shelf, eastern brazilian coast. A total of 35 of these structures were mapped, showing circular or semicircular formats. They are found on depths from 26 to 64 meters, their diameter range from 17 to 55 meters, and their internal depth varies from 8 to 44 meters. Preliminary side scan and morphological results suggest that these features are pockmarks associated with hard carbonate beds.

Key concepts: Side-scan sonar, Seafloor spreading, Geology, Sonar, Oceanography, Remote sensing, Seismology, Geodesy

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