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Multibeam bathymetry and bottom imaging (Simrad EM12D) studies on an area of about 9500 km 2 were conducted over the Pitcairn hotspot near 25 o 10'S, 129 o 20'W. In addition, 15 dives with the Nautile submersible enabled us to obtain ground-true observations and to sample volcanic structures on the ancient ocean crust of the Farallon Plate at 3500-4300 m depths. More than 100...
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