地质通报2026，Vol.45Issue(7)：1313-1327,15.DOI:10.12097/gbc.2024.02.026
基于ALOS PALSAR DEM数据的渭河盆地构造线性体提取与地震风险评估
Extraction of tectonic lineaments and seismic risk assessment of the Weihe Basin based on ALOS PALSAR DEM data
摘要
Abstract
[Objective]Situated between the Ordos Block and the Qinling Orogenic Belt,the Weihe Basin features intense tectonic activity.More than ten major active faults including the Weihe Fault and the northern margin fault of the Qinling Mountains,as well as numerous tectonic lineaments,are developed within the basin,resulting in prominent seismic hazard risks.This paper aims to systematically investigate the distribution of lineaments and their correlation with seismic activity in the study area.[Methods]Based on ALOS PALSAR DEM data with a resolution of 12.5 m,this study uses an edge detection algorithm to automatically extract tectonic lineaments in the Weihe Basin.Hydrological analysis is employed to filter out extraction artifacts caused by exogenic landforms,such as river terraces and gully systems.Focusing on earthquakes of magnitude 3 or higher,the study utilizes the weighted information content analysis method to integrate data on geogravity anomalies,bedrock lithology,and secondary structural unit data to establish a seismic risk assessment model.[Results]①Tectonic lineaments can be effectively extracted using DEM data.After post-processing to eliminate interferences,the obtained 1232 lineaments show consistent spatial distribution with known faults;②The information value of tectonic lineaments for seismic events is 0.6 with a weight of 0.57,and 90.91%of earthquake epicenters are distributed within 4000 meters of lineaments;③Medium-and high-risk zones account for 33.73%of the total study area and host 77.27%of recorded earthquakes,which are mainly distributed along lineaments.[Conclusions]Seismic activity in the Weihe Basin is predominantly controlled by tectonic lineaments.The seismic risk index map generated via the weighted information model can effectively reflect the regional probability of earthquake occurrence,providing geological support for disaster prevention and mitigation.关键词
地震风险评估/构造线性体/ALOS PALSAR DEM数据/加权信息量分析/渭河盆地Key words
seismic risk assessment/tectonic lineament/ALOS PALSAR DEM data/weighted information entropy analysis/Weihe Basin分类
天文与地球科学引用本文复制引用
陈炜,梅佳成,刘磊..基于ALOS PALSAR DEM数据的渭河盆地构造线性体提取与地震风险评估[J].地质通报,2026,45(7):1313-1327,15.基金项目
陕西省自然科学基础研究计划项目(编号:2023-JC-ZD-18) Supported by Basic Research Program of Shaanxi Natural Science Foundation(No.2023-JC-ZD-18) （编号:2023-JC-ZD-18）
