小江断裂带中段水系位移值的分组特征及其与地震活动的关系  

The Grouping of the Strike slip Data and Seismicity of the Xiaojiang Active Fault

作　　者：沈军[1,2] 汪一鹏[1,2] 宋方敏 俞维贤[1,2] 曹忠权 申旭辉[1,2] 侯学英[1,2] 李志祥 

机构地区：[1]国家地震局地质研究所 [2]云南省地震局地震工程研究院

出　　处：《中国地震》1997年第4期366-375,共10页Earthquake Research in China

基　　金：国家地震局"八五"重点项目

摘　　要：小江断裂带中段东西支断裂的水平位移具有明显的分组性，小量级位移之间具有线性增量关系，东支断裂中段增量为９～１２ｍ，南段为８～１２ｍ，西支断裂为８～１１ｍ。这种线性特征反映了小江东西支断裂具有特征型地震的活动特征，断裂位移的分组性也反映出强震之间的中、小地震和蠕滑运动产生的位移特征。可以用这些增量估计小江断裂带强震的复发周期；同时，通过与强震位移分布的对比来估计次级地震的活动强度。大量级位移之间具有倍数关系，其中，某些具特征量的位移组可能反映了与气候变化相关的时间域内的断裂位移情况。The data of the strike slip offset of Xiaojiang active fault can be obviously grouped.The groups of small slip data within 100m show an clear linear character of increments between 8m and 12m,which indicates that the segments of Xiaojiang active fault have characteristic earthquakes.The distributions of the values of each group indicate that there are smaller earthquakes and creep between two large earthquakes of each segments of the Xiaojiang active fault.The interval between two characteristic large earthquakes can be calculated with the increments of two groups of slip datum and the slip rate of the fault.Farthmore,the frequencies of smaller earthquakes can also be estimated by comparing the distributions of the displacements of the large earthquakes with the distributions of the values of each group of datum.The groups of large slip displacements show that there is close relationship between the records of the displacements of the fault and the changes of the climate.So the slip rates of each period can be determined with the characteristics of the groups of the sliping data and the events of the changs of the climate.

关 键 词：小江断裂带 地震活动特征 线性增量 水系 位移值 

分 类 号：P315.5[天文地球—地震学] P542.3[天文地球—固体地球物理学]