The present study uses the finite element method for simulating the crustal deformation due to the dislocation of a segment of the North-Tehran fault located in the Karaj metropolis region. In this regard, a geological map of Karaj that includes the fault segment is utilized in order to create the geometry of finite element model. First, finite element analysis of homogeneous counterpart of the fault’s domain with two different sections was performed, and the results were compared to those of Okada’s analytical solutions. The fault was modeled with the existing heterogeneity of the domain having been considered. The influences of both uniform and non-uniform slip distributions were investigated. Furthermore, three levels of simplification for geometric creation of geological layers’ boundaries were defined in order to evaluate the effects of the geometric complexity of the geological layering on the displacement responses obtained with the finite element simulations. In addition to the assessment of slip distribution, layering complexity and heterogeneity, the results demonstrate both the capability and usefulness of the proposed models in the dislocation analysis for the Karaj segment of North-Tehran fault.

本研究使用有限元方法来模拟由于位于卡拉季市区的北德黑兰断层的一段位错引起的地壳变形。在这方面，利用包括断层段的卡拉季地质图来创建有限元模型的几何形状。首先，对具有两个不同截面的断层域的均质对应物进行有限元分析，并将结果与​​冈田的解析解进行比较。在考虑了域的现有异质性的情况下对故障进行了建模。研究了均匀和非均匀滑移分布的影响。此外，为了评估地质分层的几何复杂性对有限元模拟获得的位移响应的影响，定义了地质层边界几何创建的三个级别的简化。除了评估滑动分布、分层复杂性和非均质性外，结果还证明了所提出模型在北德黑兰断层卡拉杰段位错分析中的能力和实用性。