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《Chinese Journal of Geophysics》 2018-03
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Low-velocity layer atop the upper mantle transition zone in Northwest Pacific subduction zone

WANG XiuJiao;HAN GuangJie;LI Juan;Institute of Geology and Geophysics,Chinese Academy of Sciences;Department of Geophysical Exploration Technology,PetroChina Research Institute of Petroleum Exploration and Development;University of Chinese Academy of Sciences;  
Since the first detection of the low-velocity layer atop the 410-km discontinuity in1990 s,the seismic structure has been revealed in many subduction zones and continental craton regions.Its characteristics and mechanism of formation are among one of the hottest topics in studies of deep mantle structure,physical properties of mantle material,and geodynamic processes.We focus on the detection and feature investigation of the low-velocity layer atop the410-km discontinuity in the northwestern Pacific subduction zone in this study.By modeling P triplicate waveforms from two intermediate-depth earthquakes,which are recorded by regionalnetwork stations,we obtain the P wave velocity structure near the 410-km discontinuity beneath northeast China and northwest area of Japan Sea.A low-velocity layer with thickness~47!14 km and~2% velocity anomaly is detected above the Mantle Transition Zone,covering a lateral range around 700 km.Combined with results from regional seismic tomography,high pressure and high temperature experiments and geodynamic simulations,we regard the "bottom-to-up"upwelling model an unlikely mechanism for the observed low-velocity layer;instead,we propose that the low-velocity layer may represent the partially melted silicates caused by dehydration of the cold and fast subducting Pacific slab near the 410-km discontinuity.The higher density makes it stable at the 410 km depth and produces the observed widely distributed low-velocity layer.
【Fund】: 国家自然科学基金(41322026 41274065);; 中国科学院战略性先导科技专项(B类)(XDB18010302)联合资助
【CateGory Index】: P631.4
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Chinese Journal Full-text Database 10 Hits
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【Co-citations】
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