Dynamic ray tracing in an anisotropic medium (original) (raw)
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Geophysical Journal International, 2020
SUMMARY It is well known that seismic data that have been recorded in complex geological environments must be compensated for geometrical spreading before AVO/AVA (amplitude-versus-offset/amplitude-versus-angle) analysis, in order to avoid erroneous imaging interpretation. By investigating analytically both the effect of the geometrical spreading and the effect of the reflector curvature on amplitude and phase changes for reflected and transmitted waves between anisotropic media, using ray theory, we show that these data should be compensated for interface effects as well. In order to gain insight more specifically in the focusing effect of the interface, the special case of homogeneous isotropic media separated by a curved interface of syncline type is discussed and compared to the case of a plane interface. 3-D numerical simulations of wave reflection from curved interfaces using a spectral element method validate our analytical derivations. In particular, numerical seismograms ob...
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