Abstract:Based on GPS coordinate time series from this decade, the velocity field of the Sichuan-Yunnan region is obtained. According to geological data, we divide this region into 7 blocks, then find the three-dimensional finite element model by ABAQUS. Through extracting the boundary value of the velocity field as model constraint conditions, we obtain numerical simulation results of displacement and stress field. The results show that our model clearly reflects the situation of pushing forces from Qinghai-Tibet plateau in the northwest and prevention from Yangzi block in the east. The displacement direction rotates clockwise on eastern Himalayan syntaxis inside rhombic block and Lhasa block. These results conform with reality. Simulation results of stress field indicate that the stress distribution is obviously uneven in some areas, such as the border region of Longmanshan, Xianshuihe and Anninghe fault zone, the border region of Xiaojinhe-Lijiang and Lancangjiang fault zone, the south and north flanks of Nantinghe fault zone, as well as the east and west flanks of Red River fault zone. Seismic risk in these areas is larger than other regions.
LIAO Sipei,HOU Qiang,DU Yongchao. Numerical Simulation of the Stress Field in Sichuan-Yunnan Region with GPS Deformation Data[J]. jgg, 2016, 36(7): 645-649.