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Characterization of Fault Deformation Behavior Based on Orthotropic Theory

SHI Fuqiang;ZHU Lin;LI Yujiang;DING Xiaoguang;Shaanxi Earthquake Agency;Institute of Crustal Dynamics,CEA;  
Two types of fault model,weak zone model and frictional contact model,and their applications in crustal dynamics simulation are summarized in this paper. Combined with their respective properties,the orthotropic theory is presented here to characterize the fault behavior. Take into account the fault strike and dip,the orthotropic constitutive equation in finite element simulation is presented in this paper. Numerical simulation result shows that the orthotropic fault model-based results agree well with the result-based on frictional contact model,both of them can characterize the relative sliding and shear behavior of the fault,without any distortional deformation in the vertical direction of the fault. This reasonable result indicates that,under the condition of the complex geological model and strict convergence of frictional contact based simulation,the orthotropic fault model can be employed to replace the frictional contact fault model to characterize the fault deformation behavior effectively.
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