华南地震2026，Vol.46Issue(1)：62-76,15.DOI:10.13512/j.hndz.2026.01.08
尼泊尔"4·25"震后地质灾害发育特征及诱发因素分析——以日喀则萨嘎县为例
Development Characteristics and Inducing Factors of Geological Disasters After the Nepal"4·25"Earthquake:A Case Study of Saga County,Shigatse
摘要
Abstract
Taking the geological disasters in Saga County,Shigatse after the"4·25"M8.1 earthquake in Nepal as the research object,combined with remote sensing interpretation,field surveys,surveying and mapping,ex-ploration and experiments,this paper systematically analyzed the development characteristics of post-earthquake geological disasters and discussed their formation conditions and inducing factors.The results show that Saga Coun-ty's relatively uniform terrain and limited elevation variance restrict the diversity and scale of geological disasters.The region is primarily affected by debris flow disasters,which are closely related to the exposed bedrock and the Quaternary alluvial strata.The development and distribution of geological disasters are strongly influenced by the re-gional topography.Specifically,the area with a slope of 30° to 50° is dominated by landslides,the area with a slope of 40°to 60°is dominated by unstable slopes,and the area with a slope of 50°to 90°is dominated by col-lapse,and debris flows mainly occur in area with a slope of less than 40°.The"4·25"Nepal earthquake had a significant impact on the regional geological environment,resulting in a decrease in slope stability.The mecha-nism of earthquake-induced disasters mainly includes direct excitation and latent recurrence:direct excitation is more pronounced in areas with hard rock,while latent recurrence is more common in soft rock and loose surface rock and soil.Geological conditions are the main factors affecting the geological disasters in Saga County,followed by rainfall and human activities.The interaction among the three has jointly shaped the mechanism of geological di-sasters in the region.关键词
地震/萨嘎县/地质灾害/发育特征/诱发因素Key words
Earthquake/Saga County/Geological disaster/Development characteristics/Inducing factors分类
天文与地球科学引用本文复制引用
杨兴明,宋骥衍,李琛..尼泊尔"4·25"震后地质灾害发育特征及诱发因素分析——以日喀则萨嘎县为例[J].华南地震,2026,46(1):62-76,15.基金项目
河南省地质研究院院管省财政项目(2025-902-XM09) （2025-902-XM09）
