Abstract
Pre-stack depth migration (PSDM) is one of the effective methods to clarify the detailed crustal structure. Multi-channel seismic (MCS) reflection data is suitable to image the detailed shallow structure, because MCS data is a dense dataset. On the other hand, ocean bottom seismographs (OBS) wide-angle data is effective to image the crustal deep structure, although the resolution of this imaging is low. Pseudo receiver gathers applying by seismic interferometry to OBS wide-angle data (SI data) is spatially a dense dataset and includes wide-angle reflections and refractions data but has a low signal to noise ratio. PSDM using SI data can produce the crustal image with an intermediate resolution. In this s tudy, in order to image the crustal structure from the seafloor to the Moho in the fore-arc region of the Izu-Bonin Island Arc, PSDM is applied to simultaneously different three datasets of MCS, OBS wide-angle, and SI data. Detailed seismic velocity structure is constructed for PSDM by the wide-angle travel-time analysis. Consequently, we successfully image the crustal structure from seafloor to the depth of 15 km. Moreover, crustal deep reflectors that cannot be imaged solely by MCS data are successfully imaged. Our results show that PSDM of integrated three datasets may be the useful method to image the whole crustal structure.
Published Version
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