The second phase is Laplace-Fourier-domain FWI, which generates a large- to mid-scale velocity model. The first phase is Laplace-domain FWI, which inverts the large-scale velocity model. We applied a 4-phase FWI in a sequential manner to obtain the correct velocity model when a dataset lacks low-frequency information and the starting velocity model is inaccurate. lack of low-frequency information and an inaccurate starting model), which can create obstacles to the practical application of FWI with real field data. The local minimum problem is caused by several issues (e.g. However, this approach suffers from the local minimum problem during optimisation procedures. Full waveform inversion (FWI) is a method that is used to reconstruct velocity models of the subsurface.
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