论文部分内容阅读
为了研究南海地壳结构，中国和日本合作在南海北部首次进行了以炸药为震源的综合地球物理调查。经初步分析其地壳结构主要特征为：南海北部地壳分为沉积层、上地壳层、中地壳层及下地壳层。大陆架及上陆坡地壳厚度大、稳定。下陆坡地壳厚度除中地壳外，其他壳层厚度减薄且不稳定。深海盆地壳分３层，厚度虽薄但相对稳定，其底部缺失７．３ｋｍ·ｓ－１的高速层。测区内地壳总厚度：陆壳２６—３０ｋｍ，过渡壳１３—２２ｋｍ，洋壳为８ｋｍ。
In order to study the South China Sea crustal structure, China and Japan conducted the first comprehensive geophysical survey using explosives as the focal point in the northern South China Sea. The preliminary analysis of the crustal structure of the main features are as follows: the northern South China Sea is divided into the sedimentary layer, the upper crust, the middle crust and the lower crust. The continental shelf and onshore continental crust are thick and stable. The thickness of the lower continental crust is thinner and unstable than the middle crust. The deep-sea basin is divided into three layers with a relatively thin but relatively stable thickness, with a high-speed layer of 7.3 km · s-1 missing at the bottom. The total crustal thickness of the survey area: continental crust 26-30km, transitional shell 13-22km, oceanic crust is 8km.