Upper-mantle velocity structures beneath the Tibetan Plateau and surrounding areas inferred from triplicated P waveforms

作     者：RiSheng Chu LuPei Zhu ZhiFeng Ding 

作者机构：State Key Laboratory of Geodesy and Earth’s DynamicsInstitute of Geodesy and GeophysicsWuhan 430077China Department of Earth and Atmospheric SciencesSaint Louis UniversitySt LouisMO 63108USA Institute of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China Institute of GeophysicsChina Earthquake AdministrationBeijing 100083China 

出 版 物：《Earth and Planetary Physics》 (地球与行星物理（英文版）)

年 卷 期：2019年第3卷第5期

页      面：444-458页

核心收录：

学科分类：07[理学] 

基　　金：supported by funding from the Strategic Priority Research Program(B)of Chinese Academy of Sciences through grant XDB18010304 Natural Science Foundation of China through grant 41322027,41374060,41374079,41661164035 

主　　题：Tibetan Plateau upper mantle structure triplication waveform modelling 

摘      要：P-wave waveforms in the distance range between 12°and 30°were analyzed to investigate upper-mantle P velocity structures beneath the Tibetan Plateau and surrounding *** waveform data from 504 earthquakes with magnitudes larger than 5.0 between 1990 and 2005 that occurred within 30°from the center of the Plateau were *** divided the study area into 6 regions and modeled upper-mantle-distance P waveforms with turning points beneath each region *** results show that the uppermantle P-wave velocity structures beneath India,the Himalayas,and the Lhasa Terrane are similar and contain a high-velocity lid about 250 km *** upper-mantle velocities down to 200 km beneath the Qiangtang Terrane,the Tarim Basin,and especially the Songpan-GarzêTerrane are lower than those in the *** 410-km discontinuity beneath these two terranes is elevated by about 20 *** anomalies are found in the transition zone below 500 km under the Lhasa and Qiangtang *** results suggest that the Tibetan Plateau was generated by thrusting of the Indian mantle lithosphere under the southern part of *** of the thickened Eurasian mantle lithosphere were delaminated;they are now sitting in the transition zone beneath southern Tibet and atop of the 410-km discontinuity underneath northern Tibet.