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During the last decades, the scientific community §spent many efforts to study the gas hydrates in §oceanic and permafrost environments. In fact, the gas §hydrate occurrence has a global significance because §it is a potential energy resource. Moreover, it may §play a role in global climate change. The detection §of a bottom-simulating reflector (BSR), by using §seismic methods, has allowed to define the §distribution of gas hydrate. In the last decades, §along the Chilean continental margin the BSR is well §reported by several geophysical cruises. In §particular, the BSR is recognized along the §accretionary prism. The main goal of this study is to §map the gas hydrate occurrence along Chilean §margin. The main results obtained from seismic §analysis are shown in this book. This analysis giving §us information regarding the seismic velocity §distribution, geothermal gradient, variation of gas §concentrations and a realistic estimate of gas-phase. §The results are promising because an important gas §reservoir was identified.