A damping method for the computation of the 2.5-D Green's function for arbitrary acoustic media
In acoustic wavefield modelling, the 2.5-D approximation, in which the model parameter is considered to be invariant in the strike direction and the source is assumed to be a point excitation so that the wavefield has 3-D features, is an economical and realistic scheme for seismic full-waveform inversion. On the other hand, according to Parseval's theorem, the least-squares inversion of time-domain seismic data is equivalent to that carried out with frequency-domain data, but the latter has some advantages such as its efficiency and flexibility in non-linear waveform (or diffraction) inversion with single- or multiple-frequency crosshole data. These inverse techniques require the computation of the response of a specified source and the Fré(c)chet derivatives in the frequency domain, both of which can be calculated via the Green's function.
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