鲁甸M_S6.5地震区域水平形变应变场演化特征  

Evolution Characteristics of Regional Horizontal Deformation and Strain Field Induced by Ludian M_S6.5 Earthquake

作　　者：陈阜超[1] 陈聚忠[1] 郭良迁[1] 张风霜[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《地震研究》2015年第4期541-548,697,共8页Journal of Seismological Research

基　　金：地震科技星火计划(XH13037Y)资助

摘　　要：根据鲁甸地震区的连续GPS观测站资料求解的站速度，使用刚性一线弹性运动方程拟合计算得到区域运动场和主应变率场。基于该结果研究了鲁甸地震区的运动场特征和应变应力场变化，讨论了它们与地震孕育发生的关系。结果显示，2012～2013年运动场北部分界带断裂走滑，南部横向运动受阻，应变应力场压性较强，有利于应变应力积聚和地震孕育，2014年运动场分界带贯穿南北，应变应力场张性增加，有利于应变应力释放而发生地震。Firstly, using the data recorded by continuous GPS observation sites in Ludian seismic region, we calculat- ed the velocity at observation sites, and got the crustal movement field and principal strain rate field by the fit- ting calculation of rigid-linear elastic motion equation. Secondly, based on the obtained results, we researched the movement field characteristics and strain stress field changes of Ludian seismic region and discussed their rela- tionship with earthquake preparation. The results show that the movement field of the fault in the boundary belt in the north was strike-slip, however the lateral movement field of the boundary belt was hindered from a strong strain compression stress field in the south of the study area, which was conducive for the forming of the stress and strain accumulation and earthquake preparation during 2012 and 2013. The movement field of boundary belt ran throughout north to south, and the extensional of strain stress field increased in 2014, which was advanta- geous to release the strain stress and induce to occur an earthquake.

关 键 词：水平运动场 主应变率场 断层主应变率 鲁甸地震 

分 类 号：P315.5[天文地球—地震学]