In this chapter, I have related the rock-physics models to the elastic sediment properties and, subsequently, AVO behavior. While using only the acoustic interval velocity enabled me to estimate hydrate and gas saturations for different hydrate deposition models, it could not uniquely differentiate between the models and, therefore, the actual in-situ saturations. Using AVO analysis based on 1-D models calculated from the estimated hydrate and gas saturations, I generated synthetic seismograms. Those seismograms were compared with the in-situ reflectivity gather and its amplitude response along the BSR. The analysis suggests that seismic cannot differentiate between hydrate as part of the pore fluid and hydrate becoming part of the solid. Even though both models have a different effect on the elastic sediment properties, those differences are too subtle to cause differences in their amplitude behavior. AVO analysis can, however, clearly distinguish the cementation model from those two hydrate models. Based on its amplitude response, which is decreasing with increasing offset, I can conclude that this model does not represent the in-situ conditions at the Blake Outer Ridge. The amplitude behavior displayed by the real data can be matched qualitatively by either hydrate being part of the pore fluid or hydrate becoming part of the solid. The resulting sediment frame is relatively weak and hydrate might clog large pore space conduits. This inferred low permeability of the hydrated sediment explains why free gas is trapped underneath the BSR.