Geomorphic Features of Zhanghe River Basin in the Taihang Mountains and Its Insight into Tectonic Implications
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摘要: 晋冀豫三省交界是太行山山脉与华北平原两大地貌的转换区，也是华北重要的地震危险区域，曾发生过多次破坏性地震，针对该区域构造活动与地貌之间的关系研究较少。漳河由东向西穿越三省，其地貌的发育和演化记录了区域构造活动的信息。因此，本文基于DEM数据，利用ArcGIS工具提取了漳河流域的面积-高程积分、地形起伏度、地表粗糙度、地表切割深度、高程变异系数、地貌参数及地形条带剖面，据此分析了区域构造隆升的特征，结合区域断裂活动，探讨了地形地貌与区域构造活动之间的关系。研究发现，漳河流域面积-高程积分曲线呈现S型，表明漳河流域地貌演化发育处于壮年期；以晋-获断裂和井陉-左权断裂为界，东部地貌参数值大于西部，表明流域内构造抬升活动具有东强西弱的特点；地形异常隆起区的边界与晋-获断裂和林州断裂的位置一致，在活动较强烈的晋-获断裂北段、林州断裂及磁县-大名断裂区域地貌参数出现异常高值，说明区域地形地貌可能与断裂活动相关，断裂的活动强度影响了区域构造抬升的幅度。通过与晋-获断裂和涉县断裂所在区域的面积-高程积分等参数值的特征和断裂活动情况进行对比分析，本文推测林州断裂可能为一条晚更新世活动断裂，具备发生6级地震的可能性。Abstract: The junction of Shanxi, Hebei, and Henan provinces represents a transitional zone between the Taihang Mountains and the North China Plain and is a significant seismic risk area in North China. Despite numerous destructive earthquakes in this region, limited research has explored the relationship between tectonic activity and landform development. The Zhanghe River traverses these three provinces from east to west, with its landform evolution preserving critical information on regional tectonic activity. This study utilizes DEM data and the ArcGIS tool to extract key geomorphic indices, including the hypsometric integral, terrain undulation, surface roughness, surface incision depth, elevation variation coefficient, geomorphic parameters, and terrain strip profiles of the Zhanghe River Basin. Based on these analyses, the characteristics of regional tectonic uplift are examined, and the relationship between topography and fault activity is investigated. The findings reveal that the hypsometric integral curve of the Zhanghe River Basin exhibits an S-shaped pattern, indicating that the region is in a mature stage of geomorphic evolution. Using the Jinhuo fault and the Jingxing-Zuoquan fault as reference boundaries, we observe that geomorphic parameter values are higher in the eastern part of the basin than in the western part, suggesting stronger tectonic uplift activity in the east. The boundaries of anomalous uplift areas align with the locations of the Jinhuo and Linzhou faults. Additionally, regions with intense fault activity, such as the northern segments of the Jinhuo, Linzhou, and Cixian-Daming faults, exhibit abnormally high geomorphic parameter values, suggesting that fault activity influences regional topography and that the intensity of fault activity correlates with the magnitude of tectonic uplift. Furthermore, a comparative analysis of the hypsometric integral characteristics and fault activity in the areas surrounding the Jinhuo and Shexian faults suggests that the Linzhou fault may be an active late Pleistocene fault with the potential to generate a magnitude 6 earthquake.1)
1 2http://www.gscloud.cn -
图 2 面积-高程积分曲线的计算及所代表的地形面（Strahler，1952）
Figure 2. The definition of the Hypsometric Intergral and different phases of river evolution（Strahler，1952）
图 3 面积-高程积分曲线图及亚流域KHI空间插值图
Figure 3. Area-elevation integral curve and sub-basin KHI spatial interpolation
图 4 研究区地貌参数综合图
Figure 4. Comprehensive map of geomorphological parameters of the study area
表 1 地形条带剖面的信息
Table 1. Topographic strip profile details
剖面编号 剖面走向 宽度/km 长度/km P1 160° 5 150 P2 160° 5 170 P3 160° 5 150 P4 245° 5 170 
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