In recent years, several laboratory measurements have been performed to determine the properties of the pure hydrate rock matrix structure. These investigations showed that the hydrate structures are very similar to pure ice structures, having a P-wave velocity of approximately 3.31 km/s and a Poisson's ratio of 0.33 Pearson et al. (1986); Whalley (1980). Additionally, Stoll et al. 1979 argued that the presence of hydrate in sediments causes a significant increase in the acoustic velocities of the sediments. This phenomenon clearly establishes the potential for a sharp acoustic impedance contrast at the boundary of a sediment region containing a considerable quantity of hydrate.