WU ShanShan,
JIANG MingMing,
HE YuMei et al
.2018.NW-SE structural contrast of shear wave velocity and radial anisotropy beneath the Hefei-Jinhua seismic profile derived from ambient noise tomography.Chinese Journal Of Geophysics,61(2): 584-592,doi: 10.6038/cjg2018L0261
NW-SE structural contrast of shear wave velocity and radial anisotropy beneath the Hefei-Jinhua seismic profile derived from ambient noise tomography
WU ShanShan1,2, JIANG MingMing1,3, HE YuMei1,3, ZHAO Liang3,4, AI YinShuang1,2,3
1. Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China; 4. State Key Laboratory of Lithospheric Evolution, Beijing 100029, China
Abstract：Ambient noise tomography can image the crustal seismic velocity structure, and further provide observational evidence for better understanding the structural and physical properties within the crust. Here, we used the ambient noise tomography method to study S wave velocity and radial anisotropy beneath the eastern tectonic boundary belt between the North China Craton and South China Block with seismic data recorded by a Hefei-Jinhua portable seismic array. Our results indicate that bounded by near 118°E-118.5°E, the northwestern part of the profile shows low velocity in the crust and positive radial anisotropy in the mid-to-lower crust, while the southeastern part exhibits relatively high velocity in the crust and negative radial anisotropy in the lower crust. Based on these tomographic results, we infer that the differences of S-wave velocity and radial anisotropy are associated with variations of crustal materials and temperature, which could be attributed to two distinct magmatic and volcanic activities experienced by the two areas since the late Mesozoic.
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