| 中国及邻近地区地壳结构 |
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| 引用本文： | 高星,王卫民,姚振兴.中国及邻近地区地壳结构[J].地球物理学报,2005,48(3):591-601. |
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| 作者姓名： | 高星 王卫民 姚振兴 |
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| 作者单位： | 1.中国科学院青藏高原研究所，北京100085 2 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： | 国家自然科学基金 (4 0 5 44 0 0 1)，中国科学院院长基金 (95 7号 )联合资助 |
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| 摘 要： | 利用中国及邻近地区数字地震台网提供的三分量地震波形记录，应用转换函数及快速模拟退火算法对中国及邻区61个地震站下的地壳横波速度结构进行了反演. 结合已发表的人工地震测深资料获得了该地区地壳厚度分布，为进一步揭示中国大陆的动力学演化过程、建立大陆动力学理论提供了可靠的地球物理证据. 结果表明中国及邻区地壳厚度分布的特点为从东到西逐渐增厚，可分为：地壳厚度缓变地区，如蒙古高原,华北，华中，华南，青藏高原内部；地壳厚度递变带，如沿大兴安岭—太行山—秦岭—大巴山—云贵高原一带；地壳厚度陡变带，主要为青藏高原边缘地区. 除青藏高原外，其他地壳厚度缓变区速度结构较简单，壳幔边界明显. 青藏高原及其南缘，台湾—菲律宾一带，台站下方速度结构复杂，反映了板块边界处构造活动、物质交换活跃，表明这些地区还未达到均衡.
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| 关 键 词： | 波形反演 速度结构 转换函数 模拟退火算法 |
| 文章编号： | 0001-5733(2005)03-0591-11 |
| 收稿时间： | 2004-07-18 |
| 修稿时间： | 2005-02-05 |
Crustal structure of China mainland and its adjacent regions |
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| GAO Xing,WANG Wei-Min,YAO Zhen-Xing.Crustal structure of China mainland and its adjacent regions[J].Chinese Journal of Geophysics,2005,48(3):591-601. |
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| Authors: | GAO Xing WANG Wei-Min YAO Zhen-Xing |
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| Institution: | 1.Institute of Qinghai_ Tibet Plateau, Chinese Academy of Sciences, Beijing 100085, China 2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | According to the three_components teleseismic records from digital seismic station network of the China mainland and its adjacent regions, the S_wave velocity structure beneath 61 teleseismic stations are investigated by using the transform function method and the SA technique. Based on the results of our work and the information from artificial seismic sounding, this paper presents Moho topography beneath the of China mainland and its adjacent regions, which is credible geophysics evidence for geodynamic evolution processes and the continental dynamics theory. The result shows that, the crustal thickness of the China mainland and its adjacent regions increase from east to west, and the crustal structure can be divided into there types, including the gentle variation region such as Mongolia plateau, North China, Central China, South China and Qinghai_Tibet plateau; the transitional region such as regions along Great Xing'an Mountains, Taihang Mountains, Qingling Mountains, Dabie Mountains and Yungui plateau; and the gradient belt such as the Qinghai_Tibet plateau periphery. Below the gentle variation regions, simple S wave velocity structure and clear crustal_mantle boundary are revealed except for the Qinghai_Tibet plateau. The S wave velocity structure beneath regions along Taiwan_Philippine Islands, the Qinghai_Tibet plateau and its south flank are complex. It indicates that tectonic movement and substance exchange are active in the plate boundary regions where the crust remains in the state of imbalance. |
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| Keywords: | Waveform inversion Velocity structure Transform function SA method |
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