Abstract
The interaction of directive finite-amplitude waves in a liquid layer embedded in two isotropic homogeneous “liquid-like” (i.e., low shear moduli) half-spaces of arbitrary impedance is reviewed in this paper via analytical solutions of the second-order acoustic wave equation. Necessary conditions for mode-locking in the layer are deduced in terms of the boundary-induced dispersion characteristics of the composite medium and the angle of intersection of the primary waves. On the basis of these results, the potential utility of parametric acoustic arrays for directive “low-frequency” penetration of typical geophysical strata is then briefly addressed.
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