| 南海中北部陆缘横波速度结构及其构造意义 |
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| 引用本文： | 卫小冬,赵明辉,阮爱国,丘学林,郝天珧,吴振利,敖威,熊厚.南海中北部陆缘横波速度结构及其构造意义[J].地球物理学报,2011,54(12):3150-3160. |
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| 作者姓名： | 卫小冬 赵明辉 阮爱国 丘学林 郝天珧 吴振利 敖威 熊厚 |
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| 作者单位： | 1. 中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所, 广州 510301;
2. 国家海洋局第二海洋研究所, 杭州 310012;
3. 中国科学院地质与地球物理研究所, 北京 100029;
4. 中国科学院研究生院, 北京 100049 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 纵横波联合勘探可以得到更多关于岩石圈层岩性、物性等介质属性方面的信息,有效提高地壳物质组成的约束性.在纵波速度结构模型的基础上,通过射线追踪和走时拟合对OBS2006-3地震剖面径向分量的转换震相进行了横波速度结构模拟.结果表明:沉积层1、沉积层2的横波速度分别为0.7～0.9 km/s和1.6～1.7 km/s,波速...
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| 关 键 词： | 海底地震仪 转换横波 波速比 下地壳高速层 |
| 收稿时间： | 2011-07-18 |
Crustal structure of shear waves and its tectonic significance in the mid-northern continental margin of the South China Sea |
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| WEI Xiao-Dong
,
ZHAO Ming-Hui
,
RUAN Ai-Guo
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QIU Xue-Lin
,
HAO Tian-Yao
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WU Zhen-Li
,
AO Wei
,
XIONG Hou.Crustal structure of shear waves and its tectonic significance in the mid-northern continental margin of the South China Sea[J].Chinese Journal of Geophysics,2011,54(12):3150-3160. |
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| Authors: | WEI Xiao-Dong ZHAO Ming-Hui RUAN Ai-Guo QIU Xue-Lin HAO Tian-Yao WU Zhen-Li AO Wei XIONG Hou |
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| Institution: | 1. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
2. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;
3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
4. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The joint exploration of P-wave and S-wave can obtain amount of information on lithology and geophysical properties, which effectively improve the composition constraint of the deep crustal structure. Based on the optimum P-wave model, the shear waves recorded on the radial components of profile OBS2006-3 have been modeled by 2-D ray-tracing. The S-wave velocities in sedimentary layer 1 and sedimentary layer 2 are of 0.7~0.9 km/s and 1.6~1.7 km/s, respectively. The Vp/Vs ratios in these sediments vary from 2.64~3.16 to 2.41. The relatively high Vp/Vs ratios are probably related to unconsolidated sediments. In the Mesozoic sedimentary layer, the S-wave velocity increases gradually from 2.6 km/s at the top to 3.0 km/s at the bottom, and the Vp/Vs ratio is of 1.74~1.80. The Vp/Vs ratio of 1.74~1.82 in the crust is considered to be the continental crust. The S-wave velocity and Vp/Vs are 4.0~4.2 km/s and 1.73~1.78 of the High Velocity Layer (HVL) in the lower crust, which suggest that the HVL has a mafic composition that may originate from underplating of the igneous rocks after the cessation of the seafloor spreading. |
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| Keywords: | Ocean Bottom Seismometer (OBS) Converted S-wave Vp/Vs ratio High velocity layer in the lower crust |
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