Robinson's paper concerns a topic of discussion in which geophysicists often find interest in attempting to describe the effect of the propagating medium on pulse wave shape and subsequently removing anelastic distortion. The present theory of linear anelastic wave propagation associates a dispersive mechanism and an absorptive mechanism with the change in pulse shape during propagation (Futterman, 1962; Ginzburg, 1955). In deference to causal considerations, these two mechanisms have been related to one another through the approximation of the Kramers-Kronig relation.

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