关键词: ALOS-PALSAR DEM 西秦岭“V”形断裂系 断裂线性 断裂解译

Abstract: The rapid development of remote sensing technology has provided people with extremely rich remote sensing data, and it has also created the problem of how to choose suitable data for fault interpretation work. In the traditional fault interpretation work, people pay more attention to high-resolution optical images and DEM, but pay less attention to medium-resolution DEM. Based on the ALOS-PALSAR DEM with a resolution of 12.5 m, this paper summarizes the typical performance and interpretation markers of the fault linearity on the hillshade map (generated by DEM), and visually interprets the “V”-shaped fault system in West Qinling Mountain with weak research on fault geometry based on the interpretation markers. The results of the research are as follows: First, this work discovers a number of fault linear belts, including the fault linearity between the Lintan-Dangchang fault and the Guanggaishan-Dieshan fault, the NE-directed fault linear zone between the Lixian-Luojiapu fault and the Liangdang-Jiangluo fault, and the arc-shaped dense fault linear zone south of the Hanan-Daoqizi fault and the Wudu-Kangxian fault; second, this work completes the fault geometry of the known active faults, such as the western and eastern sections of the Lintan-Dangchang fault, the western and eastern sections of the Liangdang-Jiangluo fault; third, fault linearities in the West Qinling Mountain exhibit a "V" shape, with two groups of fault linearities trending NW and NE, whose tectonic transformation mainly consists of two kinds: mutual cutting and arc transition, the Lintan-Dangchang fault cuts the Lixian-Luojiapu fault, the Lintan-Dangchang fault, and the Guanggaishan-Dieshan fault are connected with the Liangdang-Jiangluo fault in arc shape, the Tazang fault is connected with the Hanan-Daoqizi fault in arc shape. The research results show that ALOS-PALSAR DEM has outstanding fault linear display capabilities due to its topographic attributes and strong surface penetration. In circumstances when the surface is artificially modified strongly, the spectrum of ground objects is complex, and the vegetation is dense, the ALOS-PALSAR DEM can display fault linearity that cannot be displayed on optical remote sensing images, indicating that the medium-resolution DEM is an effective supplement to high-resolution optical remote sensing images in the work of fault linearity interpretation. The research results are of great significance for improving the geometric image of the "V"-shaped fault system in the West Qinling Mountain. It is also the basis for further research on fault geometry, kinematics, regional geodynamics and seismic hazard.

Key words: ALOS-PALSAR DEM，V-shaped fault system of the West Qinling Mountain，Fault linearity，Fault interpretation