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Finite element simulation of deformation and stress changes of Kalpin-Kemin fault system in the Southwest tianshan orogenic belt

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Science China Earth Sciences 2022年第5期65卷 863-873页

作者： Zitao WANG Huai ZHANG Qiu MENG Yaolin SHI Key Laboratory of Computational Geodynamics University of Chinese Academy of SciencesBeijing 100049China

Under the shadow of the far-field effect of the India-Eurasia collision,the tianshan orogenic belt underwent tectonic re-activation in the Cenozoic,accompanied by strong tectonic deformation and frequent large *** by two rigid cratonic blocks located in its north and south,a series of marginal foreland fold-and-thrust belts are developed within the tianshan orogenic belt and continue to develop to the bilateral pull-apart ***,the faults in the orogenic belt are *** deformation caused by thrust-related structure accounts for larger than 50%of the total convergence of the tianshan Mountains,which results in the most active structure with large earthquakes in the tianshan ***,it is of great significance to study the dynamic process of the newly generated and reactivated thrust-nappe structures in tianshan orogen via numerical *** paper selects a classical cross-section profile in the western segment of the Southwest tianshan Mountains,which contains the Kalpin-Maidan-Nalati-Kemin fault system from the south to the *** attempt to establish a two-dimensional plane strain,viscoelastic finite element model,by treating the regional faults as a whole fault system and considering the topography,fault geometry,and GPS *** displacement and stress fields of the model are retrieved,the short-term cumulative deformation field of the overall fault system is analyzed,and the rate of Coulomb failure stress change of each fault is also *** results show that the deformation is concentrated in the middle and southern parts of the Southwest tianshan *** contrast,the deformation of the Kemin fault in the north is relatively *** to the Coulomb failure stress changes of these four faults and the historical earthquake catalog,the potential seismicity of each fault is qualitatively *** preliminary results suggest that the possibility of large earthquake occurrence is higher in the

关键词： tianshan orogenic belt Viscoelastic finite element Coulomb failure stress change Seismicity

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Crust-mantle transitional zone of tianshan orogenic belt and Junggar Basin and its geodynamic implication

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Science China Earth Sciences 2001年第9期44卷 824-837页

作者：赵俊猛刘国栋卢造勋张先康赵国泽 Institute of Geology China Seismological Bureau Seismological Bureau of Liaoning Province Center for Geophysical Exploration China Seismological Bureau

The traveling time of the reflection waves of each shot point from the crust-mantle transitional zone has been obtained by data processing using wavelet transform to the waves reflected from the crust-mantle transitional zone. The crust-mantle transitional zone of the Xayar-Burjing geoscience transect can be divided into three sections: the northern margin of the Tarim Basin, the tianshan orogenic belt and Junggar Basin. The crust-mantle transitional zone is composed mainly of first-order discontinuity in the Tarim Basin and the Junggar Basin, but in the tianshan orogenic belt, it is composed of 7–8 thin layers which are 2-3 km in thickness and high and low alternatively in velocity, with a total thickness of about 20km. The discovery of the crust-mantle transitional zone of the tianshan orogenic belt and Junggar Basin and their differences in tectonic features provide evidence for the creation of the geodynamic model “lithospheric subduction with intrusion layers in crust” for the tianshan orogenic belt.

关键词： wavelet transform tianshan orogenic belt Junggar Basin crust-mantle transitional zone

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