Born-series approximation to volume-scattering wave for piecewise heterogeneous media
Born-series approximation to volume-scattering wave for piecewise heterogeneous media
复制标题
分段异质介质体积散射波的玻恩级数近似
DOI:
10.1007/s11589-014-0078-8
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发表时间:
2014-04
影响因子:
1.2
通讯作者:
Fu Li-Yun
中科院分区:
文献类型:
--
作者:
Yu Geng-Xin;Fu Li-Yun
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 %.
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