  Full waveform inversion (FWI) is one of a family of methods that allows the
reconstruction of earth subsurface parameters from measurements of waves at or
near the surface. This is a numerical optimization problem that uses the whole
waveform information of all arrivals to update the subsurface parameters that
govern seismic wave propagation. We apply FWI in the multi-scale approach on
two well-known benchmarks: Marmousi and 2004 BP velocity model. For the forward
modeling, we use an RBF-FD solver on hexagonal grids and quasi-optimal shape
parameters.
