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| | Abstract | | RSCS (Real-time Seismic Cable System) is an optical submarine cable system employing a series of 3 axial component geophones mounted in a pressure resistant case capable of withstanding hydraulic pressures up to 800 atmospheres (8000m water depth). Spreads consisting of several of geophones, spaced at 50 meters interval, have been deployed in the first survey off-Amami in March, 2006. The resulting data quality with RSCS showed that this system was effective for multi-component reflection seismic survey. The second reflection seismic survey has been carried out in December, 2006. Application of accelerometer and hydrophone in RSCS was studied. The excellent quality of the accelerometer and hydrophone data demonstrated the possibility to reduce the size of RSCS unit for the usability, operation cost and 4-component system, because accelerometer does not need the gimbals mechanism necessary for geophones. This fact is useful for the development of the more practical system in the future. As for the data processing, we applied velocity analysis on the common receiver gather and create the P and S velocity macro model. PSDM(Prestack Depth Migration) was adopted to obtain the PP and PS images. The resultant quality become fairly good, but there remains some problems about velocity estimation techniques. |
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