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From March 1976 to October 1978,comprehensive scientific investigations to the Central Pacific region were carried out four times by the R/V Xadngyanghong No.5.The total profiling line for the gravity and water depth is 57,492 km long.A beach of coral reef..(32 m deep) is found at 11°41'2S,178°20.'5W.The first two cruises have been made in the South Tuvalu reef group area,covering the range within 10°-14°S and 177° 4'E-177°W.Various kinds of reliefs are concentrated in this area,with the northeast portion belonging to the Central Pacific Basin,northwest segment to Melanesim.Basin and the south section being part of the Fiji tableland.In the middle of this area there is a typical coral island reef group,which is the product of gradual sinking of submarine volcanic cluster under tropical oceanic condition.In the area studied,the average water depth is 2,829 m,the maximum depth is 4,828m,and the mean slop is about 5°.
Woollard,G.P,and Hanna,V.M.,An Analysis of Factors Controlling Gravity and its Prediction in the Atlantic Occan,Published by Office of Naval Research,New York,1976,1-55.
Sclater,J.G.,Lawver,L.A.,and Parsons,B.,Tournal of Geophysical Research,80(1975),8.1031-1124.