caa a22 4500 477047076 CHVBK 20180405111333.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00882059 doi (NATIONALLICENCE)springer-10.1007/BF00882059 Wu Ru-Shan Institute of Tectonics, University of California, 95064, Santa Cruz, CA, USA aut Synthetic seismograms in heterogeneous media by one-return approximation [Elektronische Daten] [Ru-Shan Wu] When reverberations between heterogeneities or resonance scattering can be neglected but accumulated effects of forward scattering are strong, the Born approximation is not valid but the De Wolf approximation can be applied in such cases. In this paper, renormalized MFSB (multiple-forescattering single-backscattering) equations and the dual-domain expression for scalar, acoustic and elastic waves are derived by a unified approach. Two versions of the one-return method (using MFSB approximation) are given: One is the wide-angle dual-domain formulation (thin-slab approximation); the other is the screen approximation. In the screen approximation, which involves a small-angle approximation for the wave-medium interaction, it can be seen clearly that the forward scattered, or transmitted waves are mainly controlled by velocity perturbations; while the backscattered or reflected waves, by impedance perturbations. The validity of the method and the wide-angle capability of the dual-domain implementation are demonstrated by numerical examples. Reflection coefficients of a plane interface derived from numerical simulations by the wide-angle method match the theoretical curves well up to critical angles. For the reflections of a low-velocity slab, the agreement between theory and synthetics only starts to deteriorate for angles greater than 70°. The accuracy of the wide-angle version of the method could be further improved by optimizing the wave-number filtering for the forward propagation and shrinking the step length along the propagation direction. Birkhäuser Verlag, 1996 Wave propagation nationallicence synthetic seismograms nationallicence heterogeneous media nationallicence one-return approximation nationallicence pure and applied geophysics Birkhäuser-Verlag 148/1-2(1996-03-01), 155-173 0033-4553 148:1-2<155 1996 148 24 https://doi.org/10.1007/BF00882059 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00882059 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Wu Ru-Shan Institute of Tectonics, University of California, 95064, Santa Cruz, CA, USA aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 148/1-2(1996-03-01), 155-173 0033-4553 148:1-2<155 1996 148 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer