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Conclusions

The application of an adjoint LMO operator to teleseismic data successfully transforms recorded teleseismic wavefields to an approximate equivalent to traditional zero-offset. This transformation enables the use of zero-offset migration techniques. The hybrid survey-sinking method developed here downward continues all primary elastic scattering modes, and produces interpretable images.

Migration results for the lithospheric test model show a good recovery of the model structure. The absense of some model structure in the images is attributed to a combination of poor illumination and weak scattering amplitudes. Imaged discontinuities are slightly displaced from their true locations due to the v(z) velocity model used. In addition, diffractions do not collapse perfectly back to point-like scatterers. The general success of the derived zero-offset survey-sinking methodology and the possibility of undertaking more advanced analysis of angle-dependent scattering behavior further motivate the study of wave-equation imaging of teleseismic data Shragge and Artman (2003).


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Next: REFERENCES Up: Shragge: Teleseismic PSM Previous: Experiments
Stanford Exploration Project
7/8/2003