| 深地震测深揭示的华南地区地壳结构及其动力学意义 |
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| 引用本文： | 邓阳凡,李守林,范蔚茗,刘佳.深地震测深揭示的华南地区地壳结构及其动力学意义[J].地球物理学报,2011,54(10):2560-2574. |
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| 作者姓名： | 邓阳凡 李守林 范蔚茗 刘佳 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所,广州 510640;
2. 中国科学院研究生院,北京 100049;
3. 中国科学院地质与地球物理研究所,北京 100029 |
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| 基金项目： | 中国科学院知识创新工程重大项目，SinoProbe-03-02项目 |
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| 摘 要： | 20世纪70年代以来,我国实施与华南地区有关的深地震测深剖面达57条.本文收集该区的深地震测深研究成果,利用保真能力强的三维克里金插值技术构建了100°E～125°E,18°N～34°N区域内的三维地壳速度模型.基于三维地壳结构模型,分别探讨了华南地区不同构造单元地壳厚度空间变化特征、地壳属性、上地幔顶部地震波速变化以...
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| 关 键 词： | 华南地区 深地震测深 三维速度结构 莫霍面 Pn波速度 |
| 收稿时间： | 2011-03-09 |
Crustal structure beneath South China revealed by deep seismic soundings and its dynamics implications |
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| DENG Yang-Fan,LI Shou-Lin,FAN Wei-Ming,LIU Jia.Crustal structure beneath South China revealed by deep seismic soundings and its dynamics implications[J].Chinese Journal of Geophysics,2011,54(10):2560-2574. |
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| Authors: | DENG Yang-Fan LI Shou-Lin FAN Wei-Ming LIU Jia |
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| Institution: | 1. Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Since the 1970s, 57 DSS profiles have been carried out in South China. In this paper we collect all DSS profiles in South China, construct the 3-D crust velocity model in the region (100°E~125°E and 18°N~34°N) using robust 3-D Kriging interpolation method. We discuss the spatial distribution of Moho depth and Pn velocity in detail; analyze the relationship between average velocity and thickness in tectonic units; investigate the crust character and the subduction direction of Pacific plate to Eurasian plate. The results show that: (1) the average Moho depth of Yangtze block is about 40 km, the average crust velocity is 6.30 km/s, while the Moho depth of Cathaysia block is about 32 km, the average velocity is 6.24 km/s; (2) Sichuan basin has the same character as continental platforms in the world, Cathaysia block has the character of extended continent, Taiwan has the character of continental arcs; (3) the average Pn velocity is 8.02 km/s in Cathaysia block 7.98 km/s in Taiwan orogen, and 7.94 km/s in Yangtze block, including the fastest 8.02 km/s in Sichuan basin and the slowest 7.75 km/s in east Songpan-Ganzi. Chuandian area and east Songpan-Ganzi is relatively active, while Sichuan basin and Cathaysia block are steady; (4) the subduction direction of Pacific plate to Eurasian plate should be NW-SE. |
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| Keywords: | South China Deep seismic sounding 3-D velocity structure Moho Pn velocity |
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