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| | Abstract | | Velocity is valuable information for finding the methane hydrate-bearing sediments. The research interests in the correlation between seismic attenuation and hydrate saturation have been growing. It is because only use of velocity for finding MH-bearing sediments is not enough and recent surveys have shown that the presence of MH in sediments has significant influence on seismic attenuation. The purpose of this study is isolating the scattering attenuation from total attenuation for more accurate estimation for finding MH-bearing sediments. In this study, we used two methods for isolating the scattering attenuations and compared results. Firstly, we estimated attenuation at Nankai Trough area. The method to be applied for estimating attenuation in this study was the median frequency shift method. Secondly, we calculated scattering attenuation results by an inversion method. It is suggested that most part of total attenuation is scattering attenuation. Thirdly, we calculated scattering attenuation using synthetic data. |
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