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[1]SUN Mingzhi,TAN Kai,LU Xiaofei,et al.Three-dimensional Numerical Simulation of the Present Crustal Deformation and the Tectonic Stress Field in the Tianshan Region[J].Journal of Seismological Research,2022,45(04):535-542.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0052]

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Three-dimensional Numerical Simulation of the Present Crustal Deformation and the Tectonic Stress Field in the Tianshan Region

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 04 Page number: 535-542 Column: Public date: 2022-08-20

Title:: Three-dimensional Numerical Simulation of the Present Crustal Deformation and the Tectonic Stress Field in the Tianshan Region

Author(s):: SUN Mingzhi; TAN Kai; LU Xiaofei; ZHANG Caihong; LI Qi; LIU Zhijun; (Key Laboratory of Earthquake Geodesy,China Earthquake Administration,Wuhan 430071,Hubei,China)

Keywords:: the Tianshan region; crustal deformation; stress field; finite element numerical simulation

CLC:: P313.725

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0052

Abstract:: In the Tianshan region,the tectonic environment is complex,active fault zones are widely distributed,and earthquakes occur frequently.Based on the data of active fault zones distribution and regional rheological structures in the Tianshan region,three three-dimensional finite element models of elastic uniform delamination,viscoelastic uniform delamination and viscoelastic non-uniform delamination are established.Using GPS observations as boundary constraints and additional fault locking depth and slip rate constraints,the crustal deformation field and the tectonic stress field in the Tianshan region are simulated and calculated.The two fields’ size,distribution and characteristics are quantitatively analyzed,and the kinematic mechanism of crustal movement and deformation in the Tianshan region is discussed.The results show that the surface velocity fields simulated by the three models are in good agreement with the measured GPS results,and the optimal simulation results are obtained by the viscoelastic inhomogeneous stratified model which is most consistent with the actual situation.Changing the longitudinal medium delamination thickness of the model can influence the simulated surface velocity field,but the viscoelastic effect influences more significantly on the simulated surface velocity field,and the viscoelastic model improves the fitting degree of interseismic surface deformation.In addition,the calculation shows that the convergence rate in the Tianshan region decreases from west to east and from south to north.At the same time,the simulated stress field of the upper crust in the study area is characterized by horizontal compressional stress near N-S direction,which is consistent with the actual situation of horizontal shortening and vertical uplift of the crust as a whole in the Tianshan region.

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Last Update: 2022-08-01