Fault interactons on different time and length scales: the North-Tehran-Thrust (NTT) and the Mosha-Fasham-Fault (MFF), Alborz mountains, Nothern Iran

在挤压环境中，断层传播模式和邻近断层段的相互作用还不清楚。重要的是，对断层活动、滑动率和运动学的分析经常导致相互矛盾的评估，这需要在不同的时间尺度上对这些问题进行严格的定量评估。北德黑兰逆冲断层（NTT）和内侧的Mosha Fasham断层（MFF）是伊朗北部Alborz山脉的邻近断层，它们容纳了阿拉伯-欧亚大陆碰撞的斜向缩短。这两个断裂系统的近距离为研究不同时间和长度尺度上断裂段的相互作用和评估它们可能的联系提供了独特的机会。特别是，可以评估沿两个断层的几何、运动学、分割和横向传播。为了破译断层的时空行为，我们提出了由航空照片、高分辨率卫星图像和数字高程模型支持的大地构造场制图。为了建立南阿尔博斯前陆断裂和形变迁移的年代学，我们将利用磁地层学研究碎屑单元，用40Ar/39Ar定年法对tephra进行测年，用宇宙核素（36Cl）对地貌表面进行测年。因此，我们的工作将有助于解决测量的大地测量和地质推导的变形率之间的差异，并有助于评估破坏性地震的来源，从而有助于评估和减轻地震和相关的自然灾害。

Fault propagation patterns and interaction of neighbouring fault segments in compressional environments are not well understood. Importantly, the analysis of fault activity, slip rates, and kinematics has often resulted in contradictory assessments that call for a rigorous, quantitative assessment of these issues on different timescales. The North Tehran Thrust (NTT) and the sinsitral Mosha Fasham Fault (MFF) are neighbouring faults in the Alborz Mountains, northern Iran, which accommodate oblique shortening of the Arabia-Eurasia collision. The close proximity of both fault systems offers the unique opportunity to study the interaction of fault segments on different time and length scales and evaluate their possible linkage. In particular, geometry, kinematics, segmentation, and lateral propagation along both faults can be assessed. To decipher spatial and temporal fault behavior we propose geotectonic field mapping, supported by air photos, high-resolution satellite imagery, and digital elevation models. To develop a chronology of faulting and migration of deformation in the southern Alborz foreland, we will study clastic units with magnetostratigraphy, 40Ar/39Ar dating of tephra, and cosmogenic nuclide-dating (36Cl) of geomorphic surfaces. Our work will thus help to resolve discrepancies between measured geodetic and geologically derived deformation rates and contribute toward an assessment of the source of destructive earthquakes, and thus help to evaluate and mitigate seismic and related natural hazards.