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高玲霞, 孙道远
关键词:  横波分裂  各向异性  SKS震相  壳幔耦合
Constraining Seismic Anisotropy beneath the mainland China using Shear Wave Splitting data from China National Seismic Network
GaoLingxia, Sun Daoyuan
In this paper, we use earthquakes recorded by China National Seismic Network from 2015 to 2019 and measure shear wave splitting parameters of SKS to study the anisotropic characteristics beneath the mainland China. The fast direction changes from near WE in the western China (northwest China and Qinghai-Tibet) to near NS in the central China (Ordos and Sichuan-Yunnan), and then turns to near WE in the eastern China (North and South China). The delay times of slow wave in the eastern China are about 1.0-1.7s, which are larger than those in central and western China (about 0.6-1.0s). Together with previous studies on the crustal anisotropy of the mainland China, our results indicate that lithosphere and asthenosphere contribute most observed SKS splitting. Furthermore, we determine the coupling between crust and mantle beneath the mainland China based on whether the fast direction is consistent with the direction of the GPS velocity or not. We find that the crust-mantle coupling regions are mainly at the northeastern margin of Qinghai-Tibet block, the southern margin of Ordos, and North and South China. The decoupling regions are mainly located at the eastern Qinghai-Tibet block, the Tianshan region, the western margin of Ordos, and Yunnan region.
Key words:  shear wave splitting  anisotropy  SKS  crust-mantle coupling