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

挤压环境中断层的传播模式和相邻断层段之间的相互作用尚未得到很好的了解。重要的是，对断层活动、滑移率和运动学的分析经常导致相互矛盾的评估，这些评估要求在不同的时间尺度上对这些问题进行严格的、定量的评估。北德黑兰逆冲断层(NTT)和西南向的莫沙法沙姆断层(MFF)是伊朗北部阿尔博尔茨山脉的相邻断层，它们适应了阿拉伯-欧亚碰撞的斜向缩短。这两个断层系统的紧密相连为研究不同时间和长度尺度上断层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、分段和横向传播。为了破译断层的空间和时间行为，我们提出了大地构造场地图，并以航空照片、高分辨率卫星图像和数字高程模型为支持。为了建立阿尔博兹前陆南部断裂和变形迁移的年表，我们将研究碎屑单元的磁性地层学、特弗拉的40Ar/39Ar定年和地貌表面的宇宙成因核素定年(36Cl)。因此，我们的工作将有助于解决测量的大地形变速率和地质得出的形变速率之间的差异，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.