Inverse boundary value problem for ocean acoustics

For an ocean with constant depth and rigid bottom which contains compactly supported inhomogeneity of the water sound velocity, we prove uniqueness fo r the identification of the inhomogeneity from the Dirichlet-to-Neumann (Dt N) map on the surface of a bounded region containing the inhomogeneity. The DtN map is the map which maps the pressure applied on the boundary of this region to the corresponding flux (displacement). In an analogous geometric configuration and with similar boundary conditions, the uniqueness for the inverse electroconductivity problem from the DtN map (i.e. voltage-to-curr ent map) can be proved in the same framework. Copyright (C) 2001 John Wiley & Sons, Ltd.