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根据中国地质矿产部南海地质调查指挥部和美国哥伦比亚大学拉蒙特-多尔蒂地质观测所签订的联合调查南海地质技术合作协议及1985年3月中美双方工作会晤主要精神,中美联合调查南海地质第二阶段海上调查工作于1985年12月30日胜利结束.这次海上调查分两个航次进行.1985年10月19日中方《海洋四号》和美方《康拉德号》抵达蛇口港,20日双方进行了人员交流(三位美国科学家上中方船,三位中国科学家上美方船)和设备交换.21日两船离开蛇口赴调查区开始第一航次的调查,至11月29日结束双船地震作业,历时29天.在南海陆架、陆坡、深海盆完成了20条扩展排列剖面和两条合成排列剖面.在进行双船地震工作的同时,进行重力、磁法、测深和声纳浮标等项测量.
According to the joint investigation of the South China Sea Geological and Technological Cooperation Agreement signed by the South China Sea Geological Survey Headquarters of the Ministry of Geology and Mineral Resources of China and the Lamont-Doherty Geological Observatory of Columbia University in the United States and the main spirit of the working meeting between China and the United States in March 1985, The second phase of the geological survey of the sea ended with victory on December 30, 1985. The maritime survey was conducted in two voyages. On October 19, 1985, Chinese “Oceania IV” and U.S. “Conrad” arrived in Shekou, Hong Kong On the 20th, the two sides exchanged personnel (three Chinese scientists on the Chinese ship, three Chinese scientists on the United States side of the ship) and equipment exchange on the 21st two boats left Shekou to investigate the first voyage survey, until November 29 The end of the double-ship earthquake operations, which lasted 29 days in the South China Sea shelf, continental slope, deep basin completed 20 extended arrangement section and two synthetic arrangement profile.While carrying out the dual-ship seismic work, the gravity, magnetic method, sounding and Sonobuoy and other items measured.