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《Progress in Geophysics》 2007-05
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Inversion of P-wave velocity structure of lithosphere in the Ryukyu-Taiwan-Luzon area by nonlinear algorithm

LI Zhi-Wei,XU Yi,HAO Tian-Yao,LIU Jing-Song(Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)  
Using P wave travel-time data from the Chinese seismic networks and the ISC stations,we inversed P wave velocity structure of lithosphere in the Ryukyu-Taiwan-Luzon areas through the Differential Evolution Algorithm and moving window method.In the area with dense stations and earthquakes,the used moving window is 2°×2° with 1° intervals;in the area with sparse stations or earthquakes,the moving window is 4°×4° with 2° intervals.The result reveal obvious lateral variations of the lithosphere in the Ryukyu-Taiwan-Luzon areas: the crust in western Ryukyu is thinned due to strong thermal perturbation beneath the Okinawa Trough,while the crust in the eastern Ryukyu is thickened by the westward subduction and collision of Philippine Sea plate;the curst and lithosphere in the Taiwan area is also thickened due to the collision between the Eurasian continent and the Philippine Sea plate;the Luzon area is strongly affected by heat flow beneath island arc volcanoes.The result shows that this nonlinear algorithm is adequate to inverse lateral variation of velocity structures in large scales.
【Fund】: 中国科学院知识创新项目(KZCX3-SW-234-2)资助
【CateGory Index】: P315.31
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