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Born-series approximation to volume-scattering wave for piecewise heterogeneous media 认领 引用
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作者 Geng-Xin Yu Li-Yun Fu 《Earthquake Science》 2014年第2期159-168,共10页
An efficient approximate scheme is presented for wave-propagation simulation in piecewise heterogeneous media by applying the Born-series approximation to volume-scattering waves.The numerical scheme is tested for dim... An efficient approximate scheme is presented for wave-propagation simulation in piecewise heterogeneous media by applying the Born-series approximation to volume-scattering waves.The numerical scheme is tested for dimensionless frequency responses to a heterogeneous alluvial valley where the velocity is perturbed randomly in the range of 5%–25%,compared with the full-waveform numerical solution.Then,the scheme is extended to a heterogeneous multilayered model by calculating synthetic seismograms to evaluate approximation accuracies Numerical experiments indicate that the convergence rate of this method decreases gradually with increasing velocity perturbations.The method has a fast convergence for velocity perturbations less than 15%.However,the convergence becomes slow drastically when the velocity perturbation increases to 20%.The method can hardly converge for the velocity perturbation up to 25%. 展开更多
关键词 Generalized Lippmann–Schwinger equation Piecewise heterogeneous media Born-series approximation Volume-scattering waves
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