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| | Abstract | | It has been known that velocity is valuable information to find the methane hydrate-bearing sediments. On the other hand, the research interests in the correlation between seismic attenuation and hydrate saturation have been growing because recent seismic surveys have shown that the presence of MH in sediments has significant influence on seismic attenuation. The purpose of this study is to isolate intrinsic attenuation from total attenuation at Nankai Trough area for more accurate estimation of seismic attenuation to find the methane hydrate-bearing sediments. 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 the source-coupling effect before separating seismic attenuation for more accurate estimation. It is suggested that a part of the amplitude loss is due to a source-coupling effect. This suggestion indicates that estimated attenuation is not as high as previously estimated attenuation value. Thirdly, we calculated scattering attenuation using synthetic data. |
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