Based on the vector time-space domain Gaussian beam expression proposed by Katchalov,the vector time-space domain Green̍s function in elastic wave media is constructed.The Kirchhoff-Helmholtz integral is applied to obtain the vector wave field of the receiver point,and the divergence and curl operators are used to separate the pure P-wave and pure S-wave components from the vector wave field.Based on the attenuation compensation principle,the wave field is adjusted and the final PP and PS imaging results are achieved using source-normalized imaging conditions.Numerical experiments confirm the correctness and adaptability of the proposed method.Compared with the traditional Gaussian beam method,the approach maintains similar imaging accuracy while offering significant improvements in computational efficiency.
关键词
高斯束/时空域高斯波包/多分量/黏弹介质
Key words
Gaussian beam/time-space Gaussian packets/multi-component/viscoelastic media
维普
万方数据