红河断裂带沿线地壳稳定性GNSS监测及评价研究  

Crustal stability monitoring and evaluation along the Red River fault zone from GNSS

作　　者：刘新奇 徐克科[1] 王小怡 朱绪林 薛晨 LIU Xinqi;XU Keke;WANG Xiaoyi;ZHU Xulin;XUE Chen(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000

出　　处：《测绘科学》2023年第4期68-78,共11页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41774041)。

摘　　要：针对红河断裂带现今不同区段地震活动性差异显著,断裂活动速率低于预期的问题,该文以全球导航卫星系统(GNSS)自主组网建站的高密度观测数据为约束,综合地下断裂活动与地表形变观测结果,涵盖不同维度的7个指标因子,组成多维区域地壳稳定性监测及评价技术体系。其包括活动断裂、历史地震、地震动峰值加速度、布格重力异常、最大剪应变率、面膨胀率及闭锁程度,并基于多因素加权叠加法进行了区域地壳稳定性评价。评价结果表明,研究区以较不稳定和不稳定区为主,主要位于红河断裂带的北段、中北段和南段北部,覆盖25 260.96 km~2,占总面积的63.77%。该评价体系可为区域建设发展规划、重大工程选址及防灾减灾提供重要技术依据。In order to explore the significant variation in seismicity in different sections of the Red River fault zone today and the lower than expected rate of fault activity,this paper used the high-density observation data from the autonomous network of global navigation satellite system(GNSS) stations as a constraint,integrated the results of subsurface fault activity and surface deformation observations,and covered seven index factors in different dimensions to form a multidimensional regional crustal stability monitoring and evaluation technology system.It included active faults,historical earthquakes,peak acceleration of ground motions,Bouguer gravity anomaly,maximum shear strain rate,dilatation rate,and fault locking.And the multi-factor weighted superposition method was used to evaluate the crustal stability.The evaluation result showed that the study area was dominated by relatively unstable and unstable areas,located in the north,middle-north,and north of the south section of the Red River fault zone,with an area of 25 260.96 km~2,accounting for 63.77% of the total area.It could provide an important technical basis for regional construction and development planning,site selection of major projects,and disaster prevention and mitigation.

关 键 词：红河断裂带 地壳稳定性 GNSS 闭锁程度 

分 类 号：P228[天文地球—大地测量学与测量工程]