Reflected waves can be seen on SxRy and SyRx components of synthetic 3D9C data simulated using FD method even if the media is isotropic. If this is not an artificial error caused by forward modeling method or numerical simulation, then why? The reason for occurrence of reflected waves in SxRy and SyRx components was discovered and explained in this paper. Before that, the whole distribution of SS, SP, PS and PP reflections on each component of 9C seismic data are also analyzed. And for SS-wave, the differences between SV and SH reflections are shown and emphasized.

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