Seismic Imaging of Complex Velocity Structures by 2D Pseudo-Viscoelastic Time-Domain Full-Waveform Inversion

In the presented study, multi-parameter inversion in presence of attenuation is used for reconstruction P- and S- wave velocities density models a synthetic shallow subsurface structure that contains dipping high-velocity layer near surface with varying thicknesses. The problem layers also complicates selection an appropriate initial velocity model. forward solved finite difference, inverse preconditioned conjugate gradient. We adjoint wavefield approach computing gradient misfit function without explicitly build sensitivity matrix. proposed method capable either minimizing least-squares norm data or use Born approximation estimating partial derivative wavefields. It depends on which characteristics recorded data—such as amplitude, phase, logarithm complex-valued data, envelope misfit, linearization procedure problem—are used. showed by pseudo-viscoelastic time-domain full-waveform inversion, structures below can be imaged. However, inverting waves simultaneously mass density, better results would obtained.