The crustal structure of Iraq was investigated through analyzing teleseismic data from 12 new seismic stations. Three seismic stations are located within the Zagros Fold‐Thrust Belt, and nine are within the Mesopotamian Plain. Joint inversion of P wave receiver function and Rayleigh wave dispersion data were employed to resolve S wave velocity structure models beneath each station. Combining these models with available Moho depths within and around the study area reveals that the Moho depth is smoothly increasing from the Arabian platform toward the Zagros Mountains. An exceptional deeper root is observed near the eastern edge of the Mesopotamian Plain where sedimentary pile is the thickest. This root was interpreted as a structure inherited from the successive Mesozoic rifting of the NE Arabian platform enhanced by sedimentary loading and progressive subsidence. A low‐velocity uppermost mantle was observed beneath the Arabian Foredeep attesting the existence of a low‐strength lithospheric mantle beneath the region southwest from the Zagros deformation front. The weak rheology of the uppermost mantle may have allowed local sinking of the crust and deepening of the Moho boundary due to vertical loading and the Late Miocene lateral contraction.

中文翻译：

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伊拉克东部美索不达米亚平原的地壳结构

通过分析来自12个新地震台站的远震数据，调查了伊拉克的地壳结构。Zagros褶皱-冲断带内有3个地震台，美索不达米亚平原内有9个。利用P波接收函数和瑞利波频散数据的联合反演来求解S每个台站下方的波速结构模型。将这些模型与研究区域内和周围可用的Moho深度相结合，可以发现Moho深度正在从阿拉伯平台向Zagros山脉平稳地增加。在美索不达米亚平原东缘附近观察到异常深的根，那里的沉积物堆积最厚。该根被解释为一种结构，该结构继承自东北阿拉伯平台的中生代裂谷作用，沉积作用和渐进的沉降作用使其得以增强。在阿拉伯Foredeep下方发现了一个低速最上层地幔，证明在Zagros形变锋面西南区域下方存在一个低强度岩石圈地幔。