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Title:: Study on Crustal Deformation Characteristics in Middle Section of the Himalaya Structural Belt Based on GPS Data

Author(s):: GUO Binghui; GUO Bofeng; LI Jingwei; DANG Xuehui; (The First Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China)

摘要:: 利用2015年尼泊尔M_W7.8地震发生前后喜马拉雅构造带中段地区境内外的GPS连续站及流动站资料,以优化后的BERNESE解算策略进行数据解算,通过同震位移场分析、典型基线的时间序列分析、速度场动态变化分析等多种手段分析地震发生前后的地壳形变特征。结果表明:该次地震并没有完全释放应力积累能量,震后印度板块推挤作用并未减缓,该区域构造应力积累仍处于较高水平,震情形势值得关注。

Abstract:: In this paper,we collect the GPS data in the middle section of the Himalayas structural belt before and after the 2015 25th April M_W7.8 Gorkha,Nepal earthquake,including observation data from continuous and regional stations,and the data is solved using the BERNESE software.To study the crustal deformation before and after the Nepal earthquake,the coseismic displacement field,the typical baseline time series,and the velocity field analysis are carried out.The results show that the earthquake did not completely release the accumulated stress energy,and the push of the Indian plate did not slow down after the earthquake.Energy accumulation is still at a relatively high level,and we should pay more attention to the seismic risk.