FWI with different boundary conditions

FWI with different boundary conditions

Xukai Shen, and Robert G. Clapp

Abstract:

We compare time-domain Full Waveform Inversion using different boundary schemes: absorbing boundary condition, random boundary condition and continuation of velocity. The absorbing boundary condition requires saving the wavefield, the other two do not, but require extra wavefield modeling. The random boundary condition results in a gradient calculation that is almost as good as the absorbing boundary condition, whereas the continuation of velocity result in a gradient that has strong artifacts. However, the final inversion results using different boundaries are similar where there is a lot of data to contrain the model. When there is not so much data to constrain the inversion, results from using the random boundary condition are similar to those resulting from the absorbing boundary condition, but the continuation of velocity boundary condition does not work as well. We demonstrate this with synthetic examples.

FWI with different boundary conditions