Large Active Faults and the Wharton Basin Intraplate Earthquakes in the Eastern Indian Ocean

作     者：CHEN Jie GUO Laiyin YANG Xiaodong ZHANG Jinchang ZHANG Zhiwen SUN Mengyu LIN Jingxue CHEN Jie;GUO Laiyin;YANG Xiaodong;ZHANG Jinchang;ZHANG Zhiwen;SUN Mengyu;LIN Jingxue

作者机构：Fourth Institute of OceanographyMinistry of Natural ResourcesBeihai 536007China Department of Ocean Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China CAS Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of OceanologyInnovation Academy of South China Sea Ecology and Environmental EngineeringChinese Academy of SciencesGuangzhou 511458China China-Pakistan Joint Research Center on Earth ScienceCAS-HECIslamabad 45320Pakistan University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2023年第22卷第6期

页      面：1563-1571页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 

基　　金：supported by the Guangdong Basic and Applied Basic Research Foundation (No. 2021B1515 020098) the Project of Science and Technology Department of Guangxi Zhuang Autonomous Region to Chen J. (No. 2019AC17008) the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0205) the National Natural Science Foundation of China (No. 41890813) the Chinese Academy of Sciences Project (Nos. 133244KYSB20180029, 131551KYSB20200 021, Y4SL021001, QYZDY-SSW-DQC005, ISEE2021PY03, and E1SL3C02) the Development Fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences (No. 202207) the Guangdong Provincial Research and Development Program in Key Areas (No. 2020B1111520001) 

主　　题：Ninetyeast Ridge Wharton Basin strike-slip faults great earthquakes seismogenic structure earthquake mechanism 

摘      要：In recent years,great earthquakes occurred within the Wharton Basin in the eastern Indian Ocean,and they have been associa-ted with active faulting on the ancient oceanic *** seismogenic faults were thought to be the fault reactivation on the ancient oceanic crust,but these phenomena are still unclear and require *** study used high-quality multibeam bathymetry and multichannel seismic data collected over the northern Ninetyeast Ridge to investigate detailed fault geometry,structure,and *** recognized 12 large linear active faults by integrating bathymetry maps and multichannel seismic reflection *** results showed that these faults have high angles,and they all displaced the basement and propagated to the seafloor with distinct fault *** trended NWW-SEE with a spacing of 10–40km and were parallel to each other and the nearby subfault of the 2012 great intraplate earthquake,suggesting similar stress *** faults are also in agreement with the orientations of magnetic isochrons,implying their formation by seafloor ***,regarding the strike-slip focal mechanism of 2012 earthquakes,we proposed that these faults were created early by a normal spreading process and then evolved into a strike-slip pattern since the ancient oceanic crust ap-proached the subduction zones.