Abstract
Applying an exponential damping to seismic wavefield generates artificial low frequencies. Therefore, full waveform inversion (FWI) of such data has a potential to yield long wavelength structures using its artificial low frequencies. If we apply a shifted exponential damping to trace according to the offset distance, it is not trivial to implement the adjoint-state method for FWI. Applying a non-shifted exponential damping, or what I refer to as a stationary exponential damping, to all traces, we can accommodate the adjoint-state method; however, the time-domain FWI using the L2 norm of data misfit might fail in updating subsurface velocity model since a stationary exponential damping incurs an exponential-decrease of the amplitudes along offset axis. To nullify this adverse effect in retrieving subsurface velocity model, I suggest the global correlation objective function for FWI of exponentially damped wavefield instead of the L2 treatment.
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