摘要
利用近年陕西关中东部长水准剖面垂直形变速率资料,借助位错量与倾角分层变化的非均匀负位错模型的构建与反演,推算渭河断裂中东段几何参数,研究其应变能积累动态演化与深浅部差异性,以及与汶川大震能量释放-调整影响的关系。结果表明:1)断裂具铲形特征——地表至浅部陡立,深度与地质资料基本一致;2)应变能积累多表现在上-中层,汶川震前积累程度明显,2008—2009年减弱,可能与大震能量释放有关;2009—2010年积累方式逆转,反映震后一定程度调整影响(可能诱发了高陵4.4级地震);截至2011年调整状态尚未完全结束。
Using vertical deformation data of long-leveling section in recent years at the eastern Guanzhong in Shaanxi province,by the aid of construction and inversion with non-homogeneous negative dislocation model with stratification changes of dislocation and dip angle,the geometry parameters of the middle-eastern segments of Weihe fault are computed.The dynamic evolution of strain energy accumulation and difference between different depths together with the relation to energy release and adjustment influence of the Wenchuan earthquake are studied.The results show as follows： 1）The fault is listric nearly to right angle from earth surface to shallow layer,and the depth is basically consistent with geological data.2） The strain accumulation is mainly located at upper-middle layers,displaying obviously before the Wenchuan earthquake,decreased during 2008-2009 probably related to energy release,with reverse related to adjustment after this earthquake during 2009-2010（possibly promoted the Gaoling 4.4 earthquake）;up to 2011,this adjustment situation had not ended completely.
出处
《大地测量与地球动力学》
CSCD
北大核心
2012年第5期1-5,共5页
Journal of Geodesy and Geodynamics
基金
陕西省科技发展计划项目(2011JM5016)
关键词
水准剖面
非均匀负位错
反演
汶川地震
应变能积累
leveling section
non-homogeneous negative dislocation
inversion
the Wenchuan earthquake
strain energy accumulation
