利用地震面波频散反演岩石圈结构的奇异值分解算法

THE SINGULAR VALUE DECOMPOSITION METHODS OF INVERSION LITHOSPERIC STRUCTURE FROMTHE DISPERSION OF SURFACE WAVES

在利用面波频散数据反演介质S波速度结构的过程中，引入奇异值分解方法计算随机逆，利用Wiggins方法对较大奇异值修改和随机逆方法对较小奇异值修改的优点，协调了分辨率和解的关系，改进了随机逆解的精确性和稳定性．模型试算表明，该方法反演所得结果较Harkrider的程序反演结果精确，分辨率更高．

The singular value decomposihon method is introduced to compute the stochasticinversion in the procedure of inversing S-wave velocity structure of medium fromsurface wave dispersion. The advantages of the Wiggins method to modify largersingular value and the stochastic inversion method to modify smaller singular value areused in order to coordinate the relation between resolution and solution, and improvethe accuracy and the stability of solution of stochastic inversion. Computation modelshave indicated that the inversion results of this method are more accurate and higherresolution than those by Harkriders program.