To enhance the feasibility of the multi-parameter full waveform inversion (FWI) for field data, including various types of seismic waves, we introduce a new 2-stage elastic VTI FWI strategy. Because the influence of S-waves on FWI is dominant due to its strong amplitudes in partial derivative wavefields, some parameters may not be recovered well. In the elastic VTI FWI, c13 is a parameter that reverses direction in early stage of inversion due to reversed motions of S-S waves with strong amplitudes. To solve this problem, instead of the virtual source for c13, we use the virtual source for in isotropic parameterisation, which includes the Lamé constants and density. This approach is based on the fact that radiation patterns of P-P scattered waves for and c13 are similar to each other and that the virtual source for generates P-P dominant scattered waves. This approach allows us to enable the inversion process for c13 to behave as if we only use P-P scattered waves to invert c13. Next, we perform the multi-parametric elastic FWI again with original virtual source to compensate for the errors caused in the 1st stage and to conduct the FWI for c13 with full wavefields.


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