二维横向各向同性介质中的差分法地震波正演
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摘要
通过z-τ变换,把(x,z,t)域的波动方程变换为(x,τ,t)域的波动方程,以分离出波动方程中速度(或弹性系数)的变化项,并利用有限差分法来计算横向各向同性介质中的合成记录。差分格式采用二阶中心差商及一阶向前差商,边界条件为吸能边界。计算结果显示了横向各向同性介质中的qP、qSV及qSH波;在有界面的情形下,还较清楚地反映了反射波的存在。
Withτ-P transformation,the wave equation in(x,z,t)domain aretransformed into(x,τ,t)domain to separate tlie varying term of velocity(or elasticparameter) from the propagating term, Finite- difference method is used to calculate theseismograms in 2- D transversely isotropic media.In our calculation,the first forwardand second central differencing are used.To reduce the artificial reflection,energy- absorbent boundary conditions are applied.There appear qP,qSV and qSH waves in thesynthesized sections.Also,reflected waves are seen clearly from an interface.
引文
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