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2006年8～10月间,国家海洋局第二海洋研究所使用德国SEDIS型三分量海底地震仪以气枪为震源在南海中北部开展了广角地震反射/折射勘测,这是我国大陆科研单位第一次自主开展长距离多剖面的海底地震仪人工地震探测。勘测线共三条,总长达1176.8km,工区最大水深4137m,共投放48台次,回收成功率95.8%。所获得的数据质量良好,深部信息丰富,可直观地分辨出Pg、Pn、PmP等震相,为南海中北部深部地壳结构、洋壳与陆壳分界和西北、西南次海盆的形成演化研究提供了重要的依据。
From August to October 2006, the Second Institute of Oceanography of the State Oceanic Administration carried out a wide-angle seismic reflection / refraction survey using the SEDIS three-component seabed seismograph in the central and northern South China Sea using air guns as the focal point. This is the first of mainland China’s scientific research units Time to independently carry out long-distance multi-section seismographic artificial seismic exploration. A total of three survey lines, a total length of 1176.8km, the maximum depth of 4137m work area, put a total of 48 times, recovery success rate of 95.8%. The obtained data are of good quality and rich in deep information. The seismic facies such as Pg, Pn and PmP can be visually distinguished, providing the research results for the deep crustal structure, the boundary between oceanic crust and continental crust and the formation and evolution of northwest and southwest subbasins in the central and northern South China Sea An important basis.