Isotropic angle-domain elastic reverse-time migration

Examples

We test the different imaging conditions discussed in the preceding sections with data simulated on a modified subset of the Marmousi II model (Martin et al., 2002). The section is chosen to be at the left side of the entire model which is relatively simple, and therefore it is easier to examine the quality of the images.

vp,rx
Figure 3. (a) P- and S-wave velocity models and (b) density model used for isotropic elastic wavefield modeling, where $V_P$ ranges from $1.6$ to $3.2$ km/s from top to bottom and $V_P/V_S=2$, and density ranges from $1$ to $2$ g/cm$^3$ .

de1,de2,df1,df2
Figure 4. Elastic data simulated in model 3a and 3b with a source at $x=6.75$ km and $z=0.5$ km, and receivers at $z=0.5$ km: (a) vertical component, (b) horizontal component, (c) scalar potential and (d) vector potential of the elastic wavefield. Both vertical and horizontal components, panels (a) and (b), contain a mix of P and S modes, as seen by comparison with panels (c) and (d).

ieall0,ieall1,ieall2,ieall3
Figure 5. Images produced with the displacement components imaging condition from equation . Panels (a), (b), (c) and (d) correspond to the cross-correlation of the vertical and horizontal components of the source wavefield with the vertical and horizontal components of the receiver wavefield, respectively. Images (a) to (d) are the $zz$, $zx$, $xz$ and $xx$ components, respectively. The image corresponds to one shot at position $x=6.75$ km and $z=0.5$ km. Receivers are located at all locations at $z=0.5$ km.

jeall0,jeall1,jeall2,jeall3
Figure 6. Images produced with the scalar and vector potentials imaging condition from equation . Panels (a), (b), (c) and (d) correspond to the cross-correlation of the P and S components of the source wavefield with the P and S components of the receiver wavefield, respectively. Images (a) to (d) are the $PP$, $PS$, $SP$ and $SS$ components, respectively. The image corresponds to one shot at position $x=6.75$ km and $z=0.5$ km. Receivers are located at all locations at $z=0.5$ km. Panels (c) and (d) are blank because an explosive source was used to generate synthetic data.

Isotropic angle-domain elastic reverse-time migration