Inversion of fault slip parameters based on DInSAR and automated fault model discretization method

The inversion of geometry and motion parameters of the seismogenic fault based on elastic dislocation model and constrained by coseismic deformation data obtained by DInSAR has great significance for understanding the activity characteristics of the fault and assessing the risk of potential disasters .The existing inversion methods of fault slip parameters are mostly based on the uniform discretization with rectangular dislocation units or artificially setting discretizaiton , which will lead to “pseudo-slip” or the phenomenon that the slip distribution is too smooth to reflect the slip details on the fault plane .Therefore , the automated fault model discetization method is introduced in this paper , which takes into account the principle of the minimized residuals and the optimal smoothing scales of the model , so the reliable solution can be obtained under the effective constraints .The inversion of geometry and slip parameters of fault in Bam earthquake is taken as an example .The experimental results show that using the automated fault model discretization method to invert the motion parameters of the single fault can generate reliable results.