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| | Abstract | | For imaging subsurface velocity structures deeper than those obtained by refraction traveltime tomography, we are developing refraction and reflection tomography that simultaneously inverts refraction and reflection traveltimes on a regular velocity grid. Our approach to trace reflection raypaths and to calculate reflection traveltime residuals, is based on a migration velocity analysis concept applied in surface seismic reflection processing. Through preliminary examinations including numerical experiments, we recognize that this method could be considerably robust and applicable, while it requires labor intensive and interpretive processes, and some assignments to be solved before applying it to field datasets are also clarified. |
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