[1]LIU Changwei,CHANG Zufeng,LI Chunguang,et al.Finite Element Simulation of Lower Crustal Dragging and Fault Activity in Sichuan-Yunnan Region Constrained by GPS[J].Journal of Seismological Research,2019,42(03):385-392.
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Finite Element Simulation of Lower Crustal Dragging and Fault Activity in Sichuan-Yunnan Region Constrained by GPS
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
42
Number of periods:
2019 03
Page number:
385-392
Column:
Public date:
2019-07-24
- Title:
- Finite Element Simulation of Lower Crustal Dragging and Fault Activity in Sichuan-Yunnan Region Constrained by GPS
- CLC:
- P315.727
- DOI:
- -
- Abstract:
- Under the constraint condition extracted by the boundary value of GPS velocity field in Sichuan-Yunnan area(96°～107°E,21° ～35°N),based on geological data,we established the three-dimensional finite element model of Sichuan-Yunnan region by using ANSYS. Then we divided the Sichuan-Yunnan region into four blocks,and simulated the lower crustal dragging and the strike-slip rates of two main active faults by using the static analysis module. The results show that when only the boundary value of GPS velocity field is loaded around the model,the displacement velocity of Sichuan-Yunnan rhombic block is obviously different from the measured velocity,which does not satisfy the geodynamic characteristics of this area. After increasing the dragging load of the lower crust,the simulation results of velocity field are optimized and the difference of displacement velocity of rhombus decreases. Simulating shear forces produced by the lower crustal dragging,it is found that the optimal simulation results can only be obtained when the direction of the dragging changes from southeast to Southeast near the Xiaojinhe fault,which indicates that the direction of the lower crustal dragging is deflected. In addition,the simulated strike-slip rates of Xianshuihe and Xiaojiang faults are 8.9 mm/a and 6 mm/a respectively,which are in good agreement with the actual strike-slip rates. The optimized results can provide reference for the study of fault zone blocking.
- References:
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Last Update:
2019-07-24