Travel time tomography in elastic wave imaging domain based on ADCIGs

Compared with acoustic data tomography, the elastic vector wave tomography can more effectively reflect the propagation law of elastic waves in underground media. S-wave and P-wave imaging can be combined to obtain a more accurate description of the medium. There are two problems in the conventional multi-component seismic data processing. One is that the Z and X components of the multi-component seismic data are simply treated as P and S waves respectively, and this kind of approximate processing of different wave shapes will produce a strong illusion. Secondly, PP-wave and PS-wave are processed separately. In this method, P-wave and S-wave components are obtained by wave field separation based on acoustic wave equation, which strongly depends on the precision of wave field separation. In addition, the construction process of scalar wave field ignores the vector characteristics of elastic wave propagation, so it is urgent to process and interpret multi-component seismic data based on elastic vector wave framework.