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| | Abstract | | We estimated seismic attenuation (quality factor, Q) from marine seismic reflection data acquired at Nankai Trough in Japan. The attenuation results are compared with those from Vertical Seismic Profile (VSP), and hydrate saturation. In the case of reflection data we could observe high attenuation in methane hydrate bearing sediments over the BSR region. However, in the case of VSP, attenuation increased only in gas layers. This inconsistency of attenuation results between reflection seismic and VSP, and negative Q values may be due to tuning effect. In this study, we carried out a simple numerical test to see how tuning effect influences on seismic attenuation estimation. |
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