基于OLI和DEM数据初步研究盘谷寺断裂新构造运动特征  

Preliminary Study on Neotectonic Movement Characteristics of Pangusi Fault Based on OLI and DEM Data

作　　者：马兴全 王志铄 张扬 Ma Xingquan;Wang Zhishuo;Zhang Yang(Henan Earthquake Agency,Zhengzhou 450016,China)

机构地区：[1]河南省地震局,郑州450016

出　　处：《震灾防御技术》2020年第2期359-368,共10页Technology for Earthquake Disaster Prevention

基　　金：河南省地震构造探查(2018—2020年)。

摘　　要：太行山南缘盘谷寺断裂新构造运动特征对分析太行山地区构造地貌演化,乃至研判我国东部新构造活动形势具有重要意义。基于Landsat 8 OLI遥感影像数据和ASTER GDEM数据,对盘谷寺断裂线性构造进行初步解释,分析冲沟发育、坡向坡度等构造地貌特征,通过构建遥感影像与高程数据相叠加的三维地貌模型,进一步优化断裂构造地貌视觉效果。研究结果表明,盘谷寺断裂为1条平面呈舒缓波状、近东西走向的南倾正断层。在断裂下盘,由西向东依次发育了密集的平行状侵蚀沟、断层三角面和低矮的侵蚀残丘等多种构造地貌类型,反映了断裂不同部位垂向运动的差异性。构造运动导致断层两盘地表坡向和坡度的明显变化,综合剖面分析结果,认为断裂在新构造期活动强度由西向东逐渐减弱。Research on the neotectonic movement characteristics of Pangusi fault on the Southern margin of Taihang Mountain is of great importance to analyze the evolution process of tectonic landforms of Taihang Mountain block, and even to judge neotectonic movement situation of East China. Based on Landsat 8 OLI remote sensing images data and ASTER DEM data, this paper preliminarily explained the linear structure of the Pangusi fault, and analyzed gully development, aspect, slope, etc. By constructing a three-dimensional geomorphic model superimposed by remote sensing images and elevation data, we further optimized the visual effects of structural geomorphology of Pangusi Fault. The results show that Pangusi fault is a south-dipping normal fault with a gently wavy plane and a near eastwest trend. In the lower walls of the fault, a variety of tectonic features such as dense parallel erosion ditches, fault triangular surfaces and low erosion hammock have been developed in order from west to east, which reflects the differences in vertical movement of different parts of the fault. The tectonic movement caused a significant change in the aspect and slope on both sides of the fault. Based on the profile analysis results, the activity intensity of the fault gradually weakened from west to east during the neotectonic period.

关 键 词：太行山 盘谷寺断裂 构造地貌 三维地貌模型 

分 类 号：P315.2[天文地球—地震学] P546[天文地球—固体地球物理学]