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Distinct variations of crustal shear wave velocity structure and radial anisotropy beneath the North China Craton and tectonic implications

Distinct variations of crustal shear wave velocity structure...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Cheng Cheng Ling Chen Huajian Yao Mingming Jiang Bingyu Wang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences IGPP Scripps Institute of OceanographyUCSDLa JollaCAUnited States

This study presents the crustal shear wave velocity structure and radial anisotropy along two linear seismic arrays across the North China Craton(NCC) from ambient noise *** a half to one year long ambient noise data from 87 stations were used for obtaining the inter-station surface wave empirical Green’s functions(ECFs) from *** and Love dispersion curves within the period band 5-30 s were measured from the EGFs of the vertical and transverse components,*** dispersion data were then used to determine the crustal shear wave velocity structure(V and V) and radial anisotropy (2(V - V) /(V + V)) from point-wise linear inversion with constraints from receiver function analysis. Our results reveal substantial structural variations among different parts of the *** Bohai Bay Basin in the eastern NCC is underlain by a thin crust(～30 km) with relatively low velocities(particularly V) and large positive radial anisotropy in the middle to lower *** a crustal structure is no longer of a cratonic type and may have resulted from the widespread tectonic extension and intensive magmatism in this region since late *** the Ordos Basin in the western NCC,the crust is relatively thicker(>40 km) and well stratified,and presents a large-scale low velocity zone in the middle to lower crust and overall weak radial anisotropy except for a localized lower crust *** overall structural features of this region resemble those of typical Precambrian shields,in agreement with the long-term stability of the *** crustal structure under the Trans North China Orogen(TNCO,central NCC) is more complicated and characterized by smaller scale velocity variations,strong positive radial anisotropy in the middle crust and rapid change to weak-to-negative anisotropy in the lower *** features may reflect complex deformations and crustmantle interactions,probably associated with tectonic extension and magmatic under

关键词： Ambient noise tomography North China Craton Crustal shear velocity radial anisotropy Crustal deformation

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