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1.2 Two-layer TI model

This example demonstrates the approach on a two-layer TI model, in which the first layer is a very strong VTI medium with $ v_{p0}=2500 m/s$ , $ v_{s0}=1200 m/s$ , $ \epsilon=0.25$ , and $ \delta=-0.25$ , and the second layer is a TTI medium with $ v_{p0}=3600 m/s$ , $ v_{s0}=1800 m/s$ , $ \epsilon=0.2$ , $ \delta=0.1$ , and $ \theta=30^{\circ}$ . The horizontal interface between the two layers is positioned at a depth of 1.167 km. Figure 6a and 6d display the horizontal and vertical components of the displacement wavefields at 0.3 s. Using the pseudo-pure-mode qP-wave equation, we simulate equivalent wavefields on the same model. Figure 6b and 6e display the two components of the pseudo-pure-mode qP-wave fields at the same time step. Figure 6c and 6f display pseudo-pure-mode scalar qP-wave fields and separated qP-wave fields respectively. Obviously, residual qSV-waves (including transmmited, reflected and converted qSV-waves) are effectively removed, and all transmitted, reflected as well as converted qP-waves are accurately separated after the projection deviation correction.

ElasticxInterf PseudoPurePxInterf PseudoPurePInterf ElasticzInterf PseudoPurePzInterf PseudoPureSepPInterf
ElasticxInterf,PseudoPurePxInterf,PseudoPurePInterf,ElasticzInterf,PseudoPurePzInterf,PseudoPureSepPInterf
Figure 6.
Synthesized wavefields on a two-layer TI model with strong anisotropy in the first layer and a tilted symmetry axis in the second layer: (a) x- and (d) z-components synthesized by original elastic wave equation; (b) x- and (e) z-components synthesized by pseudo-pure-mode qP-wave equation; (c) pseudo-pure-mode scalar qP-wave fields; (f) separated scalar qP-wave fields.
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Next: 1.3 BP 2007 TTI Up: 1. Simulating propagation of Previous: 1.1 Homogeneous VTI model

2014-06-24