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| | Abstract | | Pre-stack depth migration (PSDM) of wide-angle seismic reflection and refraction survey data has a potential to image deep reflectors because the amplitude from a deep reflector becomes large at the wide-angle offset. However, PSDM of wide-angle data has rarely been applied to the actual data because practical wide-angle surveys are usually too sparse to apply the PSDM. Seismic Interferometry (SI) can dramatically change the situation. By applying the SI to the wide-angle (airgun-OBS) data set, pseudo and dense receiver gathers can be generated. In this study, we generated pseudo receiver gathers by applying SI to the actual airgun-OBS data obtained in the North-Western Pacific region, and we tried to image oceanic Moho, which was about 12km below the sea surface, by applying PSDM to the synthesized receiver gathers. We conducted a large number of parameter tests, and finally succeeded in clearly imaging the oceanic Moho. |
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