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The International Conference on Dam Safety (ICDS) organised by the Department of Water Resources, River Development & Ganga Rejuvenation, Ministry of Jal Shakti has concluded at Rajasthan International Centre (RIC) in Jaipur. The closing session
Subducted slabs of oceanic lithosphere are key drivers of mantle convection, representing the cold limbs of mantle convection. Seismic tomography has long been the leading tool to study subducted slabs, where present-day high seismic velocity structures are interpreted as subducted slabs. The present-day mantle structure can then be used to explore subducted slab sinking history by linking subducted slabs to paleosubduction remnants on the surface, such as magmatic arcs. In this process, subducted slabs are assumed to sink vertically at a constant rate. Numerical models of mantle convection provide a tool which can reconstruct mantle structure through time, making it possible to investigate the temporal and spatial evolution of subducted slab sinking dynamics. The present-day mantle structure predicted by convection models can be compared to mantle structure imaged by seismic tomography to validate the convection models. In this study, three palaeogeographically constrained mantle conv
Northwest Pacific-Izanagi subduction histories along Eurasia are poorly constrained due to extensive subduction, which partially consumed the western Pacific plate and the entire Izanagi plate, its hypothesized conjugate margin. Here we reconstruct NW Pacific-Izanagi plate tectonics since Cretaceous times by mapping and structurally restoring (i.e. unfolding) the subducted western Pacific slabs from regional and global tomography, and re-creating the vanished Izanagi plate as its conjugate rift flank. Unfolding of the western Pacific slabs based on their cross-sectional areas, corrected for ‘tomographic smearing’, reveals that 2230 to 5000 km of western Pacific plate was subducted between Kamchatka and the southern Marianas. We add our restored western Pacific and Izanagi plates to a global plate model to reveal that Izanagi subduction under Eurasia after the mid-Cretaceous was limited between the present Bohai Bay-Yellow Sea, China, and northern Russia. The southern limit of Izana
The southern Cascadia forearc undergoes a three-stage tectonic evolution, each stage involving different combinations of tectonic drivers, that produce differences in the upper-plate deformation style. These drivers include subduction, the northward migration of the Mendocino triple junction (MTJ) and associated thickening and thinning related to the Mendocino Crustal Conveyor (MCC) effect, and the NNW translation of the Sierra Nevada-Great Valley (SNGV) block. We combine geodetic data, plate reconstructions, seismic tomography and topographic observations to determine how the southern Cascadia upper plate is deforming in response to the combined effects of subduction and NNW-directed (MCC- and SNGV-related) tectonic processes. The location of the terrane boundaries between the relatively weak Franciscan complex and the stronger KMP and SNGV block has been a key control on the style of upper-plate deformation in the southern Cascadia forearc since the mid-Miocene. At ~15 Ma, present-da