f Two case histories of diffraction tomography applied in engineering geophysics

This paper presents the application of diffraction tomography to real data in engineering geophysics. In the past many papers developed the theory of diffraction tomography and discussed possible applications (Devaney and Beylkin, 1984; Wu and Toksöz, 1987). This new inversion technique is based on the acoustic wave equation. It tries to reconstruct the velocity perturbation against a constant background (constant density assumed) from a scattered, diffracted wavefield. In contrast to traveltime tomography where only picked times of some phases are inverted diffraction tomography uses the full wavefield.