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Large Active Faults and the wharton basin Intraplate Earthquakes in the Eastern Indian Ocean

Journal of Ocean University of China 2023年第6期22卷 1563-1571页

作者： CHEN Jie GUO Laiyin YANG Xiaodong ZHANG Jinchang ZHANG Zhiwen SUN Mengyu LIN Jingxue Fourth Institute of Oceanography Ministry of Natural ResourcesBeihai 536007China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China CAS Key Laboratory of Ocean and Marginal Sea Geology South 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 Science CAS-HECIslamabad 45320Pakistan University of Chinese Academy of Sciences Beijing 100049China

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.

关键词： Ninetyeast Ridge wharton basin strike-slip faults great earthquakes seismogenic structure earthquake mechanism

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