Inversion of fault slip parameters based on DInSAR and automated fault model discretization method
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摘要: 以合成孔径雷达差分干涉测量(DInSAR)技术获得的同震形变数据为约束,基于弹性位错模型反演获得发震断层的几何、运动参数(也称滑动参数),对于了解震区断层活动特征和评估潜在灾害风险具有重要意义。现有的断层滑动参数反演多是基于矩形位错元的均匀剖分或人为设定剖分,所得结果易出现“伪滑动”和滑动分布过于平滑的问题,不足以精确地反映断层面上的滑动细节。为此,引入断层自动剖分方法。该方法兼顾了模型残差最小化与平滑最优原则,在形变数据的有效约束下获得可靠解。以巴姆地震为例反演获得断层的几何参数与滑动参数。实验结果表明,对于单断层的滑动参数反演,应用断层自动剖分方法可获得较可靠的结果。Abstract: 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.
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