Elastic-energy imaging condition based on energy-flow vector

Elastic reverse-time migration can effectively deal with multicomponent seismic data in which the imaging condition based on energy norm can extract the scalar-imaging result from multicomponent data. However, the energy cross-correlation imaging condition characterized by particle velocity and stress suffers from the problem of overdependence on the background elastic parameters. Therefore, we characterize the elastic-wave energy using the energy-flow vector, which is equal to the energy density, without background elastic parameters. According to the source and receiver wave fields, we propose an imaging energy-flow vector and an elastic-wave energy imaging condition. Under the assumption of a plane-wave solution, the backscattering suppression is verified. The numerical simulations show that the elastic-energy imaging condition can obtain the energy image without backscattering. Compared with the cross-correlation imaging conditions in a vector-based wave field, the proposed imaging condition can eliminate the dependence on the background elastic parameters and effectively process seabed multicomponent data, which are conducive to further providing an interpretation of marine geological structures.