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南海西北次海盆深地震测线OBS2006-2数据重新处理及深部地壳结构研究; Reprocessing of the deep seismic line OBS2006-2 along the Northwestern sub-basin of the South China Sea and its crustal velocity structure
Thesis Advisor赵明辉
Degree Discipline地质工程
Keyword异常数据处理 海底地震仪 (Obs) 格式转换 广角反射/折射地震 双峰海山
Abstract作为西太平洋最大、最独特的边缘海,南海以其独特的地理位置、复杂的构造环境和丰富的地质现象对海底扩张、板块运动和边缘海的形成演化等热点问题提供了绝佳的研究场所。西北次海盆位于南海深海盆的西北部,构造上毗连西沙海槽、西沙地块及南海北部陆缘,是多种构造单元的汇聚区域,因而西北次海盆深部地壳结构的研究,对于深入了解北部陆缘的拉张、海盆的扩张和各构造单元之间的关系有着极其重要的科学意义。 本文以国家海洋局第二海洋研究所和中国科学院南海海洋研究所合作于2006年布设并实施的唯一一条平行于西北次海盆残余扩张脊方向的广角反射/折射地震测线(OBS2006-2)为基础,对二台异常数据台站(OBS03和OBS06)通过数据格式检查、邻近台站对比分析和重采样等方法成功地对这二台OBS数据进行了解编处理,得到了这二个台站的综合地震记录剖面;利用二维射线追踪与走时反演方法(Rayinvr)共拟合了10000多个震相走时信息,分别获得了测线下方的深部地壳速度结构模型,综合西北次海盆及其邻区的地质构造背景,分析了南海西北部沿残余扩张脊的地壳结构特点以及海盆的扩张演化过程。并在以下几个方面展开了重点研究并取得了重要进展:
Other AbstractAs the largest and the most distinct marginal sea of the western Pacific Ocean, the South China Sea (SCS) provide a superexcellent spot for the researches of seafloor spreading, plate motion and the evolution and formation of the marginal sea because its particular geographic location, complicated structural setting and affluent geological phenomenon. The Northwestern Sub-basin is located in the northwestern part of the SCS, and it is adjacent to Xisha Trough, Xisha block and the northern continental margin of the SCS, so it is obvious that the Northwestern Sub-basin is a convergence region of various tectonic units. Thus, it is of great scientific importance to insight into the relationships among the extension of the northern continental margin, the extension of the sea basin and the each tectonic unit. Based on the only wide angle seismic reflection/refraction survey line which was carried out under the cooperation between Second Institute of Oceanography, State Oceanic Administration and South China Sea Institute of Oceanology, Chinese Academy of Sciences in 2006 and oriented NW and crossed the spreading ridge of Northwest Sub-basin, and after reprocessing of two abnormal OBS data by means of data format checking, adjacent OBSs' signals comparison and data resampling, ray-tracing method is employed to modeling P-wave velocity distribution beneath the line with combination of other geological resources including magmatism and tectogenesis. Then, we analysis our recovered velocity model and further explore the evolution history of Northwest Sub-basin. Through above work, five main conclusions are obtained as following.
Document Type学位论文
Recommended Citation
GB/T 7714
王强. 南海西北次海盆深地震测线OBS2006-2数据重新处理及深部地壳结构研究, Reprocessing of the deep seismic line OBS2006-2 along the Northwestern sub-basin of the South China Sea and its crustal velocity structure[D],2016.
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