基于河流阶地变形的华蓥山断裂西南段活动性研究  

Activity of the southwest segment of the Huayingshan fault based on river terrace deformation

作　　者：刘浩 梁朋[1] 李文巧[1] 田勤俭 张彦博 徐岳仁[1] LIU Hao;LIANG Peng;LI Wenqiao;TIAN Qinjian;ZHANG Yanbo;XU Yueren(Institute of Earthquake Forecasting,CEA,Beijing 100036,China;China Earthquake Disaster Prevention Center,Beijing 100029,China)

机构地区：[1]中国地震局地震预测研究所地震预测重点实验室,北京100036 [2]中国地震灾害防御中心,北京100029

出　　处：《地震工程学报》2025年第3期716-726,共11页China Earthquake Engineering Journal

基　　金：中国地震局地震预测研究所基本科研业务费(CEAIEF20230403,CEAIEF20240402,2020IEF0603,2021IEF0104);国家重点研发计划项目(2023YFC3012001);科技基础资源调查专项项目(2021FY10010405)。

摘　　要：华蓥山断裂带是四川盆地内部的一条非常重要的边界断裂,近年来在华蓥山断裂带附近发生了两次6.0级中强震,因此研究华蓥山断裂的活动性十分重要。文章在分析研究区沉积历史的基础上,通过中分辨率数字高程模型(DEM)对研究区内多条河流的阶地面进行提取;然后结合无人机高分辨率DEM数据和野外调查对提取的阶地面进行验证;最终获取华蓥山断裂西南段一带岷江、金沙江、长江和沱江河流阶地的空间分布特征。通过分析研究区夷平面和阶地的位相图所反映的变形特征,结合各级地貌面的形成时代,认为华蓥山断裂西南段在中更新世活动明显,而在晚更新世活动减弱甚至不活动。研究结果对华蓥山断裂西南段地震危险性评估以及近年来中强震的发震构造判别具有非常重要的意义。In recent years,two moderate earthquakes of magnitude 6.0 occurred near the Huayingshan fault zone,a critical boundary fault within the Sichuan Basin.Therefore,it is crucial to study the activity characteristics of the Huayingshan fault.From the sedimentary history analysis of the study area,river terraces were first extracted using medium-resolution digital elevation models(DEMs).These terraces were then validated using high-resolution DEM from unmanned aerial vehicles and field surveys.Finally,the spatial distribution characteristics of terraces along the Minjiang River,Jinsha River,Yangtze River,and Tuojiang River in the southwest segment of the Huayingshan fault were systematically obtained.On the basis of the deformation characteristics and formation ages of the stratified geomorphic surfaces,the southwest segment of the Huayingshan fault exhibited significant activity during the Middle Pleistocene but weakened or ceased activity in the Late Pleistocene.These findings provide critical insights for seismic hazard assessment of the southwest segment of the Huayingshan fault and the identification of seismogenic structures of recent moderate earthquakes.

关 键 词：华蓥山断裂西南段 河流阶地 断裂活动性 DEM 

分 类 号：P315[天文地球—地震学]