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- W2023578390 abstract "The Nankai trough has attracted the interest of earth scientists for a long time, as it constitutes a natural laboratory for studying the subduction processes. The discovery of the role of £uids in the development of accretionary complexes, then of their relationship to the way the seismogenic zone works, has further boosted scienti¢c research on subduction tectonics. A ¢rst cooperative program was established between Japan and France in the early 1980s to survey the subduction trenches around Japan, followed by more focused programs on the Nankai trough (KAIKO^NANKAI and KAIKO^TOKAI). All these programs have made use of state-of-the-art technology such as submersibles, swath mapping and deep-towed systems. In this special issue, 11 papers are published based on contributions to the International Symposium on ‘Japan^France KAIKO^TOKAI Project ^ Tectonics of subduction in the Nankai trough’ held in Tokyo, Japan, in March 1998. They cover a broad range of topics related to subduction tectonics and associated phenomena: surface and deep tectonic structure, cold seeps, gas hydrates, gravity and erosional processes, all intimately linked in the subduction context of the Nankai trough. A ¢rst set of three papers present the structural and kinematic background of the eastern Nankai trough, which is probably now one of the best imaged convergent margins in the world. The deep crustal structure of the eastern Nankai trench is presented by Nakanishi et al. (2002) based on an extensive seismic refraction and wide-angle re£ection survey performed in 1996. It provides a clear image of the subducting plate geometry, revealing signi¢cant lateral variations in crustal structure that may partly control the size of the rupture area of large earthquakes. More details of the con¢guration of the main thrusts are provided by a 120-channel re£ection seismic survey also performed in 1996 (Takahashi et al., 2002). The data make it possible to follow the subducting Philippine Sea plate beneath the continental slope of Japan and to image the main thrusts. The survey also covered the Zenisu ridge, an uplifted oceanic crustal block located south of the eastern Nankai trough, which is interpreted as resulting from intra-oceanic thrusting. Similar intra-oceanic thrusting ^ a paleo-Zenisu ridge ^ is also demonstrated to occur beneath the accretionary wedge (Mazzotti et al., 2002). This rather unusual occurrence of successive intra-oceanic shortening is interpreted as successive ‘micro-collisions’ of volcanic massifs of the nearby Izu^Bonin arc during an otherwise steady-state subduction process. Insights into how the collision of the Izu^Bonin arc has proceeded since the Pliocene are provided by the reconstructions of the paleobathymetry based on foraminifers (Akimoto et al., 2002). The next set of papers are more closely related" @default.
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- W2023578390 date "2002-07-01" @default.
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- W2023578390 title "Japan–France KAIKO–TOKAI Project – Tectonics of subduction in the Nankai trough" @default.
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- W2023578390 doi "https://doi.org/10.1016/s0025-3227(02)00241-4" @default.
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