基于ALOS-PALSAR DEM的山体阴影图识别断裂线性——以西秦岭地区为例  

IDENTIFYING FAULT LINEAMENT BASED ON ALOS-PALSAR DEM:A CASE STUDY FROM THE WEST QINLING MOUNTAINS

作　　者：张波 王爱国 田勤俭 葛伟鹏 贾伟 姚赟胜 袁道阳 ZHANG Bo;WANG Ai-guo;TIAN Qin-jian;GE Wei-peng;JIA Wei;YAO Yun-sheng;YUAN Dao-yang(Gansu Lanzhou Geophysics National Observation and Research Station,Lanzhou 730000,China;China Earthquake Disaster Prevention Center,Beijing 100029,China;Hainan Earthquake Agency,Haikou 570203,China;School of Earth Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]甘肃兰州地球物理国家野外科学观测研究站,兰州730000 [2]中国地震灾害防御中心,北京100029 [3]海南省地震局,海口570203 [4]兰州大学地质科学与矿产资源学院,兰州730000

出　　处：《地震地质》2022年第1期130-149,共20页Seismology and Geology

基　　金：中国地震局地震科技星火计划项目(XH19045Y);中国地震局地震预测研究所基本科研业务专项(2021IESLZ06);国家重点研发计划项目(2018YFC1503206);甘肃省青年科技基金(20JR10RA504)共同资助。

摘　　要：在传统的断裂解译工作中,人们更重视高分辨率的光学影像和DEM,而对中分辨率DEM的重视程度较低。文中基于分辨率为12.5m的ALOS-PALSAR DEM和断裂线性解译标志,对断裂几何学研究薄弱的西秦岭“V”形断裂系进行了目视解译。所得结果包括:1)新发现了多条断裂线性带,例如位于礼县-罗家堡断裂和两当-江洛断裂之间的以NE向为主的断裂线性带;2)完善了已知活动断裂的几何展布图像;3)西秦岭的断裂线性呈“V”形,NW、NE 2组断裂的构造转换方式主要包括相互截切和弧形过渡。研究结果表明,ALOS-PALSAR DEM具有突出的断裂线性显示能力,是高分辨率光学遥感图像的有效补充。研究结果对于完善西秦岭“V”形断裂系的几何图像具有重要意义,也是进一步深入开展断裂几何学、运动学研究的基础。The most significant feature of active faults on remote sensing images is fault lineament.How to identify and extract fault lineament is an important content of active fault research.The rapid development of remote sensing technology has provided people with extremely rich remote sensing data,and has also created the problem of how to choose suitable data for fault interpretation.In the traditional fault interpretation,people pay more attention to high-resolution optical images and high-resolution DEM,but optical remote sensing images are greatly affected by factors such as weather condition,vegetation and human impacts,and the time and economic costs for obtaining high-resolution DEM are relatively high.Due to the low resolution,the medium-resolution DEM(such as Aster GDEM,SRTM1,SRTM3,etc.)is generally used to automatically extract structural lineament,and then analyze the overall regional structural features,but it is rarely used to visually interpret active faults.ALOS-PALSAR DEM is generated from SAR images acquired by the phased array L-band synthetic aperture radar mission sensor of the Japanese ALOS satellite.It is currently a free DEM with the highest resolution(resolution of 12.5m)and the widest coverage.Based on ALOS-PALSAR DEM and ArcGIS 10.4 software,this paper generates a hillshade map and visually interprets the fault lineaments in the West Qinling Mountains.When generating a hillshade map,we set the light azimuths to be oblique or orthogonal to the overall trend of the linear structures,the light azimuths to be consistent with the slope direction of the hillslope,and the light dips to be a medium incident angle.Based on the hillshade map generated from ALOS-PALSAR DEM,this paper summarizes the typical performance and interpretation markers of fault lineaments on the hillshade map(generated by DEM),and visually interprets the V-shaped fault system in West Qinling Mountains where the research on fault geometry is limited based on the interpretation markers.The results of the research are as follows:F

关 键 词：ALOS-PALSAR DEM 西秦岭“V”形断裂系 断裂线性 断裂解译 

分 类 号：P542.3[天文地球—构造地质学]