Tong’s research focuses on Q-related processing in anisotropic media. With two developed viscoelastic VTI propagators based on GSLS model (for inversion) and Kjartansson’s constant-Q model (for imaging), he has conducted FWI for attenuation estimation, and demonstrated the necessity of understanding Q-anisotropy by applying Q-compensated time-reversal imaging for microseismic source characterization.
Vladimir’s research is focused on image-guided migration-based travel time tomography and waveform inversion for acoustic TI media.
In order to obtain an improved estimation of the subsurface physical properties within fewer iterations, Daniel utilizes imaging operators derived from the wavefield energy norm for least-squares migration and tomography. Such operators exploit polarization and directionality from the extrapolated wavefields to mitigate artifacts that retard convergence towards the desired subsurface model.