Abstract
In this work a single channel seismic line surveyed in Joetsu Basin in Japan Sea, a known site of gas hydrate (GH) occurrence, was used to calibrate zones of high and low absorption related to hydrates. Adopting the premises of normal ray (seismic) incidence and flat ocean bottom, with the support of viscoelastic seismic modeling, it was possible to differ zones of high and low absorption in a qualitative fashion. In such analysis high absorption zones coincides with the occurrence of BSR (bottom simulating reflectors) pointing out to the fact that attenuation is stronger in hydrate zones than in neighboring domains without GH. Quantitative analysis using the same premises and averaging the power spectra through windowed fourier transform, reveals a Qavg ranging from 50 to 60 for hydrate bearing sediments and Qavg higher than 100 for the domain without hydrate.
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