Estimation of anisotropic sediment parameters

Abstract

Parabolic equation techniques have recently been developed for solving geoacoustic inverse problems [R. J. Cederberg and M. D. Collins, IEEE J. Ocean Eng. 22, 102–109 (1997)] and for handling propagating problems involving anisotropic elastic layers [A. J. Fredricks, J. Acoust. Soc. Am. 101, 3182 (1997)]. These techniques are used to investigate inverse problems involving anisotropic elastic layers. Complications arise from the direction dependence of the two sediment sound speeds. For the particular case of transverse isotropy, both sound speeds need to be estimated in two different directions. A coordinate rotation technique [M. D. Collins and L. Fishman, J. Acoust. Soc. Am. 98, 1637–1644 (1995)] will be employed to estimate the resolvability of the direction-dependent wave speeds for different experimental configurations. [Work supported by ONR.]