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| | Abstract | | This study shows the application of reverse time migration based on seismic interferometry to surface-related multiple reflections observed in the ocean bottom seismograph (OBS) survey. In a crustal-scale OBS survey, spatially continuous imaging with primary reflections is difficult for shallow reflectors, because the imaging area is limited to beneath each OBS which is deployed with large intervals. In order to obtain continuous reflection image along the whole survey line, key technique is utilization of the multiple reflection signals by means of the seismic interferometry. The image domain seismic interferometry is a direct migration method of the multiple reflections based on an imaging condition combined with concept of the seismic interferometry. Compared to the general data domain seismic interferometry, synthesizing of the virtual source data for redatuming is not necessary before migration process. In this study, the proposed method is verified with the OBS survey data in Nankai trough. The result shows a good continuous reflection image in the shallow part from just below seafloor. The image domain seismic interferometry is a useful depth imaging method to integrate the primary reflections and the multiple reflections for full wavefield imaging in the OBS survey. |
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