利用GPS研究红河断裂带的地壳形变及断层运动特征  

Current Crustal Movement and Fault Dislocation Model of the Red River Fault Zone

作　　者：闫欢欢 乔学军[1] 聂兆生[1] 王伟[1] 赵斌[1] YAN Huanhuan;QIAO Xuejun;NIE Zhaosheng;WANG Wei;ZHAO Bin(GPS Laboratory,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所GPS实验室,湖北武汉430071

出　　处：《测绘地理信息》2019年第1期36-40,共5页Journal of Geomatics

基　　金：国家自然科学基金(41504011)

摘　　要：利用红河断裂带及其邻区的2009～2014年间144个GPS测站的三期观测数据,将红河断裂带分为北、中、南三段,计算并分析了该地区的水平速度场,并采用DEFNODE程序反演了红河断裂带的闭锁和滑移亏损分布特征。结果表明,红河断裂带呈现较为明显的分段特征,断裂带的水平运动速度由北向南、由东向西逐渐减小,且GPS水平速度场在跨越断层时呈现较为均匀的二次线性变化;断层位错模拟结果表明,红河断裂带北段的闭锁程度明显高于中部和南部,其北段在44km深度处闭锁系数为1.0,达到完全闭锁状态,相应的红河断裂带北段的滑移亏损量也明显高于中部和南部。上述结果表明,红河断裂带北部的应变积累能力较强,地震危险性较高。The Red River fault zone are divided into three parts:the north,central and south part,based on the GPS survey data at 144 GPS sites during 2009-2014 in the Red River fault zone and its adjacent areas.The horizontal movement velocity field of the area is calculated and analysised,and the locking and slip deficit distribution characteristic of the Red River fault zone are inversed through DEFNODE.The results indicate that the Red River fault presents relatively obvious segmentation features,and the horizontal movement velocity of the fault zone are gradually decrease from the north to the south and from east to west,in addition,the GPS horizontal velocity field changes uniformly while crossing the fault;the inversion results of DEFNODE indicate that the locking rates in the north part of the Red River fault zone are obviously stronger than that in the central and south parts,and the locking coefficient of the north part in the 36 km below the earth’s surface is 1.0,meaning that the fault in the north part reaches the completely locking states,then slip deficit amount is obviously greater than it in the central and south part accordingly.The results above indicate that the capacity of strain accumulation in the north part of the Red River fault is strong,and the seismic is high.

关 键 词：红河断裂带 GPS速度场 闭锁特征深度 滑移亏损 

分 类 号：P228[天文地球—大地测量学与测量工程]