In this report, anacoustic FWI with an unknown attenuation model type is investigated. Numerical experiments are performed using a SLS true model type. Assuming a known Q model type which differs from the true Q model type led to very poor results, arguably worse than the results of an acoustic FWI. By relaxing the requirement of known model type and recovering anacoustic parameters over small frequency bands, results were dramatically improved. This recovery of model parameters of a known attenuation model type locally in frequency is a promising approach for coping with unknown attenuation model type.
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