喜马拉雅碰撞造山带和羌塘盆地的瑞雷波频散与三维速度结构

The frequency dispersions of Rayleigh waves and 3-D velocity structures in Himalayan collision orogenic zone and Qiangtang basin

本文利用我国地震台站数字记录的瑞雷波资料，通过适配滤波频时分析技术和网格频散反演方法，求得了喜马拉雅碰撞造山带和羌塘盆地的瑞雷波频散和群速度的三维结构。再结合其它地球物理资料，研究了该区不同构造地带的地壳与上地幔结构、深层过程和三维模式，并探讨了青藏高原大陆物质运移的运动学过程和动力学机制。主要内容为：①青藏高原地壳、上地幔盖层和上地幔低速层的结构、分区格局及其空间展布；②羌塘盆地深部构造背景与油气远景；③雅鲁藏布江地带断裂体系和地球物理场异常特征；④喜马拉雅碰撞造山带的构造格架与深层过程。

With the use of the Rayleigh wave data digitally recorded by earthquake observation stations in our country, the frequency dispersions of Rayleigh waves and the3--D structures of group velocity in Himalayan collision orogenic zone and Qiangtangbasin have been obtained by using adaptive filtering frequency--time analytic technique and inversion method of mesh frequency dispersion. By making combinativeanalysis of other geophysical data, the authors studied the crusts, upper mantles,deep--layer process and 3--D models of various structural zones in the area, and discussed the kinetic process and dynamic mechanism of sediment migration inQingzang plateau continent. The main points consist of = the structures and distributions of the crusts, upper--mantle cap formation and upper--mantle low--velocitylayer of Qingzang plateau ; the deep structural background and hydrocarbon potential of Qiangtang basin; the fault system and the geophysical--field characteristics inYarluzangbo (Yalu Tsangpo) River zone ; the structural framework and deep--layerprocess of Himalayan collision orogenic zone.