Abstract
The implementation of an accurate and efficient forward/backward modelling approach plays a very important role in full waveform inversion (FWI), in which the finite difference method (FDM) with rectangular grid is mostly adopted. However, the FDM has the ripple-shaped divergence/scattering problem when dealing with uneven interface. On the contrary, a meshless method called GFDM is suitable for flexibility of simulation region, and can be of interest for solving the above problem. Hence, we develop a meshless frequency-domain acoustic modeling method with GFDM to improve the accuracy and eliminate the divergence. Then we apply the GFDM to inverse problem and propose a meshless FWI method. The proposed method reduces lots of the computations and memory usage of frequency-domain FWI, and successfully suppress the ripple-shaped scattering. Numerical examples demonstrate that our method can efficiently improve numerical accuracy and recover an accurate velocity model, which is helpful for high-precision seismic exploration through the complex earth.
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