oa An adaptive resolution full-waveform inversion using a mesh-free finite-difference method

In the present study, we propose a new strategy of full-waveform inversion with adaptive resolution for reducing the computational costs (calculation time, computational memory). We adopt a mesh-free finite difference method to calculate wavefield and waveforms at receivers. Since the method can carry out the forward modeling without regular lattice or mesh structure, an adaptive refinement of calculation points could be applied to complex velocity structures in a simple manner. We introduce the outline of the proposed approach, and demonstrate the effectiveness of our method using a numerical experiment. Our results show the adaptive refinement of the calculation points only around low velocity zones. This indicates that our approach can reduce the computational burden in simple and automatic manners.