Space domain algorithm of elastic wave-field decomposition in VTI media
Guo Peng1, He Bingshou1, Shen Jiqian2
1. Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao, Shandong 266100, China;
2. Geological Geophysical Exploration and Mapping, Nanjing, Jiangsu 210046, China
Abstract：Based on wave number domain wave-field decomposition,qP wave and qS wave decomposition in transversely isotropic media with a vertical symmetry axis is implemented in space domain in this paper.The decomposition operators in wave number domain are constructed using the polarization vectors evaluated by solving the Christoffel equation,then IFFT is applied and decomposition operators in space domain are derived.Wavefield decomposition with multi-component characteristics can be obtained by convolution operation between spatial operator varied with spatial locations and multi-component wavefield.Since the algorithm developed in this paper utilizes corresponding decomposition operators in each grid point,it can adjust to the condition that anisotropic parameter varies spatially.Elastic wavefield model tests in homogeneous VTI media,stratified VTI media and anisotropic version of sigsbee2A model have proven the efficacious of this algorithm.
