Simulating propagation of separated wave modes in general anisotropic media, Part I: qP-wave propagators |

Next we test the approach of simulating propagation of the separated qP-wave mode in a complex TTI model. Figure 7 shows parameters for part of the BP 2D TTI model. The space grid size is 12.5 m and the time step is 1 ms for high-order finite-difference operators. Here the vertical velocities for the qSV-wave are set as half of the qP-wave velocities. Figure 8 displays snapshots of wavefield components at the time of 1.4s synthesized by using original elastic wave equation and pseudo-pure-mode qP-wave equation. The two pictures at the bottom represent the scalar pseudo-pure-mode qP-wave and the separated qP-wave fileds, respectively. The correction appears to remove residual qSV-waves and accurately separate qP-wave data including the converted qS-qP waves from the pseudo-pure-mode wavefields in this complex model.

vp0,epsi,del,the
Partial region of the 2D BP TTI model: (a) vertical qP-wave velocity, Thomsen coefficients
(b)
and (c)
, and (d) the tilt angle
.
Figure 7. |
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Elasticx,Elasticz,PseudoPurePx,PseudoPurePz,PseudoPureP,PseudoPureSepP
Synthesized elastic wavefields on BP 2007 TTI model using original elastic wave equation and pseudo-pure-mode
qP-wave equation respectively: (a) x- and
(b) z-components synthesized by original elastic wave equation; (c) x- and
(d) z-components synthesized by pseudo-pure-mode qP-wave equation;
(e) pseudo-pure-mode scalar qP-wave fields; (f) separated scalar qP-wave fields.
Figure 8. |
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Simulating propagation of separated wave modes in general anisotropic media, Part I: qP-wave propagators |

2014-06-24