Mantle flow underneath the South China Sea revealed by seismic anisotropy

作     者：Fansheng Kong Rui Gao Stephen S.Gao Kelly H.Liu Weiwei Ding Xiongwei Niu Aiguo Ruan Pingchuan Tan Jianke Fan Shaoping Lu Zhengyi Tong Liqun Cheng Wenfei Gong Yanghui Zhao Jiabiao Li Fansheng Kong;Rui Gao;Stephen S.Gao;Kelly H.Liu;Weiwei Ding;Xiongwei Niu;Aiguo Ruan;Pingchuan Tan;Jianke Fan;Shaoping Lu;Zhengyi Tong;Liqun Cheng;Wenfei Gong;Yanghui Zhao;Jiabiao Li

作者机构：Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural Resources Southern Marine Science and Engineering Guangdong Laboratory Geology and Geophysics ProgramDepartment of Geosciences and Geological and Petroleum Engineering Missouri University of Science and Technology School of Earth Sciences and Engineering Sun Yat-sen University Key Laboratory of Marine Geology and EnvironmentInstitute of Oceanology Chinese Academy of Sciences 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2023年第10卷第10期

页      面：54-61页

核心收录：

学科分类：070904[理学-构造地质学] 070801[理学-固体地球物理学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 

基　　金：supported by the National Natural Science Foundation of China (41890811, 41976071, 42025601 and 42076047) the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)(311021003) supported by the United States National Science Foundation (1830644) 

主　　题：mantle flow South China Sea Tibetan Plateau seismic anisotropy shear wave splitting 

摘      要：It has long been established that plastic flow in the asthenosphere interacts constantly with the overlying lithosphere and plays a pivotal role in controlling the occurrence of geohazards such as earthquakes and volcanic eruptions.Unfortunately,accurately characterizing the direction and lateral extents of the mantle flow field is notoriously difficult,especially in oceanic areas where deployment of ocean bottom seismometers(OBSs) is expensive and thus rare.In this study,by applying shear wave splitting analyses to a dataset recorded by an OBS array that we deployed between mid-2019 and mid-2020 in the South China Sea(SCS),we show that the dominant mantle flow field has a NNW-SSE orientation,which can be attributed to mantle flow extruded from the Tibetan Plateau by the ongoing Indian-Eurasian collision.In addition,the results suggest that E-W oriented flow fields observed in South China and the Indochina Peninsula do not extend to the central SCS.