基础润色：The acoustic assumption neglects the energy loss of P-wave caused by elastic effects This means that compared to the elastic assumption the same size of model perturbation generates stronger wave

The acoustic assumption overlooks the energy loss of P-wave due to elastic effects. As a result, the same perturbation in model size induces a greater perturbation in waveform under the acoustic assumption, compared to the elastic assumption. Consequently, AFWI can approximate waveform amplitude using field data with minimal model updates, which may result in premature iteration termination. On the other hand, EAFWI based on the elastic assumption addresses this issue effectively.