Abstract: Since the 1970s, active tectonics has advanced from qualitative research to quantitative research. Many researchers focus on which qualitative parameters to obtain and how to obtain them. It is usually accepted that the following parameters are necessary for quantitative descriptions of active faults:length of a fault or segment, displacements, slip rates, and paleo-earthquake events. Because of the complex nature of problems concerned and limited capability of human recognition, there are still some errors and uncertainties in these parameters. Tectonic geomorphology provides a useful tool to help solve the problems above. Tectonic geomorphology could record long-term accumulation of tectonics, and quantize them by relevant parameters. Tectonic movements have been exerting significant influence upon formation of topography and landforms, and such processes are usually extremely slow over very long time which cannot be documented by human history and any instruments. Observations, especially direct measurements of various features of geomorphology can reveal details of tectonic movement, including slip on active faults. In the early time, such studies were usually limited in one or two parameters of geomorphology to characterize active tectonics. With rapid development of computer and DEM technologies, it is possible to use multiple parameters of landforms to describe regional tectonic activity. Previous work in this aspect focused on large scales, while a little on small scale faults or individual faults. And existing studies are mostly concerned with normal or thrust faults dominated by vertical motion. In this paper, we focus on the Nantinghe Fault, which is strike-slip fault. Based on high resolution DEM extracted from ALOS data, we extract 180 drainages along the Nantinghe Fault. Based on the relationship between deflection angles and faulting, we analyze the segmentation and activity. Using the distribution patterns of the factors, this study examines the geometry and activity of the Nantinghe Fault, which were obtained from comprehensive remote sensing interpretation and field investigations. The results provide an example for research on the relationship between faulting and landforms.

Key words: deflection angle, tectonic geomorphology, Nantinghe Fault

摘要： 构造地貌能够记录构造运动的长期积累，并能通过相关参数定量表达。水系是对构造作用反映最敏感的地貌之一，长期以来许多研究者利用水系来反映和研究构造。但是过去的研究大都集中在垂直运动的构造作用区域上，尤其是正断层区域上，而对走滑作用区域的研究非常少。文中以南汀河断裂带为研究区域，利用高精度DEM数据提取水系。通过研究断层附近水系流域的偏转来研究南汀河断裂带的运动模式。通过分析流水地貌对断层活动的响应特征，对断裂带的空间展布和活动性进行了分析，为探讨活动断层与地貌响应之间的关系提供良好范例。

关键词: 水系偏转角, 构造地貌, 南汀河断裂带