考虑倾角的位错模型反演鲜水河断裂滑移速率  

Inversion study of Xianshuihe fault zone by the dip-considered screw dislocation model

作　　者：唐梓柯 丁开华 周伟[1] 刘蓬 明祖涛 TANG Zike;DING Kaihua;ZHOU Wei;LIU Peng;MING Zutao(School of Geography and Information Engineering,China University of Geosciences,Wuhan 430078,China)

机构地区：[1]中国地质大学(武汉)地理与信息工程学院,武汉430078

出　　处：《测绘科学》2021年第12期7-15,共9页Science of Surveying and Mapping

基　　金：国家博士后基金项目(2016M592408)。

摘　　要：针对经典螺旋位错模型和考虑倾角的螺旋位错模型的差异,该文通过模拟实验对比分析了基于螺旋位错模型进行走滑型断层滑移速率反演时断层倾角对反演结果的影响。在此基础上,以川滇地区1999—2019年中国地壳运动观测网络提供的GPS资料为约束,采用带有倾角改正的螺旋位错模型反演了鲜水河断裂带北中南各段的现今滑移速率。通过与未考虑断层倾角的经典螺旋位错模型反演结果的对比,发现带有倾角改正的模型的反演精度更高,在一定程度上能更加客观地反映鲜水河断层的形态特征:各段的倾角、闭锁深度以及滑移速率各异;相比中段,北段和南段的闭锁程度较高,表明其具有更高的地震危险性。Aiming at the comparison between the classic screw dislocation model and the dip-corrected screw dislocation model,and the impact of the fault dip on the results inverted by above two screw dislocation models through some experiments.Constrained by the GPS data from the Crustal Movement Observation Network of China(CMONOC)in the Sichuan-Yunnan region between 1999 and 2019,we solved for the current slip rate of the north,middle and south segments of Xianshuihe fault based on the dip-considered screw dislocation model.Through the comparison with the inversion results by the classical screw dislocation model,it is found that higher inversion accuracy is obtained by the dip-considered screw dislocation model,and more detailed fault features are reflected objectively to some extent.Namely,the dip angle,the locking depth and slip rate are different from each segment of the fault;compared with the middle segment,the locking degree of the north and south segments is higher,which implies a higher seismic risk.

关 键 词：GPS速度场 螺旋位错模型 鲜水河断裂带 滑移速率 

分 类 号：P228[天文地球—大地测量学与测量工程]