Director: Yaolin Shi
Member: Mingyu Wang, Zhongliang Wu, Dongping Wei, Shunliang Chi, Qingli Zeng, Xiaojuan Qiao
We are committed to quantitative research on stress intensity variation of lithospheric blocks and faults in non-constant stress field, to understand the seismogenic process and its corresponding variation process of multiple physical fields, in order to find out the relevance between earthquake precursory information and seismic generation. The evolution of lithospheric stress field can be divided into two stages: the slow accumulation stage of stress in a large time scale before fracture; the rapid rupture stage with fracture occurrence and propagation, seismic wave’s radiation, and stress variation. The main scientific problems in seismogenesis stage include: studying the coupling effect of mechanics, heat transfer and pore fluid; realizing the parallel computing to solve this large-scale complex problem; Analyzing and optimizing the model based on comparison of numerical results and observations. The research on seismic rupture stage can be divided into 4 aspects according to the specific problem, which are static, quasi-static, dynamic and high-frequency-dynamic. As a multi-scale physical process in time and space, earthquake contains a preparation period lasted for several or even thousands of years, and also a rupture period lasted for only hundreds of seconds at most in which micro ruptures develop into huge faults with hundreds of kilometers length. Thus, it is needed to realize the simulations of the two physical processes respectively, and then to unify these into one simulation system to solve the whole process of earthquake preparation and rupture, in order to establish the theoretical basis of earthquake prediction.