The 3-D P-wave velocity structure of the northern half of Iran crust has been determined from the local earthquake tomography using a high-quality data set of semi-automatically re-picked arrival-times. The quality and quantity of these re-picked phase data allows the 3-D imaging of large parts of the northern half of Iran lithosphere between 0 and 60 km depth. Our new P-wave tomography model represents a major improvement over existing models in terms of reliability, resolution and consistency. First-order anomalies such as the crustal roots of the Zagros and Alborz Mountains are clearly resolved. In addition, several shallow smaller-scale features like the Central Iran sedimentary basin and volcanic and igneous rocks are visible in the tomographic image. Our results show deep Moho depressions beneath the Central Alborz and Zagros mountain ranges that are part of the Arabia-Iranian-Eurasia continental collision zone and locally this Moho topography agrees very well with existing models of other studies. The observed P-wave velocity structure suggests that compared to the Sanandaj-Sirjan and Zagros mountain ranges there is a minor crustal thickening beneath the Alborz mountain range and Kopeh Dagh region.

中文翻译：

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局部地震层析成像在伊朗北半部的区域3-D岩石圈结构

伊朗地壳北半部的3-D P波速度结构是通过使用半自动重新选择的到达时间的高质量数据从当地地震层析成像技术确定的。这些重新选择的相位数据的质量和数量允许对0到60 km深度的伊朗岩石圈北半部大部分进行3D成像。我们新的P波断层扫描模型在可靠性，分辨率和一致性方面都比现有模型进行了重大改进。一阶异常，例如Zagros和Alborz山脉的地壳根，已得到明确解决。此外，在断层图像中还可以看到几个浅的较小尺度的特征，例如伊朗中部沉积盆地以及火山岩和火成岩。我们的研究结果表明，中阿博兹山脉和扎格罗斯山脉下方的莫霍洼陷较深，属于阿拉伯-伊朗-欧亚大陆碰撞带的一部分，该莫霍地形在局部与其他研究的现有模型非常吻合。观测到的P波速度结构表明，与Sanandaj-Sirjan和Zagros山脉相比，Alborz山脉和Kopeh Dagh地区下地壳略有增厚。