中国东部海域岩石层S波速度结构

S Wave Velocity Structure of Lithosphere beneath the Seas in Eastern China

一、引言中国东部海域是全球板块构造体中的一个特殊区域,它的形成和发展及其内部各种地质现象与欧亚板块、太平洋板块、菲律宾板块间的相对运动和相互作用紧密相关。由于新生代以来板块间强烈的相互作用,造就了该区域丰富多样的构造单元,地壳-上地幔横向分布极不均匀。本文研究区域如图1中所示,在东经114°~145°,

The objective is to reveal the characters of three dimension S wave velocity structure of lithosphere beneath the seas in eastern China. High quality Rayleigh wave data from 31 stations have been used in this investigation. A new grid inversion method (i.e. Occam's inversion) has been adopted to calculate the pure path dispersion curves. The group velocity maps of Rayleigh waves from 10 to 150 seconds have been obtained by Occam's inversion. The changes of S wave velocity of media have been inverted as a step of 1°after getting the true path dispersion of each grid nodes. The models of three dimension S wave structure of lithosphere beneath the seas in eastern China have been constructed through inversion. The results suggest that there is much difference among the velocity structure of lithosphere in different structural units beneath the seas in eastern China.