利用带倾角断层形变公式研究川滇块体东边界断裂带形变特征  

Deformation Characteristics of the Eastern Boundary Fault Zone of Sichuan-Yunnan Block Using the Deformation Formula of Seismic Fault with Dip Angle

作　　者：邹镇宇[1] 江在森[1] 武艳强[2] 张龙 崔月菊[1] ZOU Zhenyu;JIANG Zaisen;WU Vanqiang;ZHANG Long;CUI Yueju(Key Laboratory of Earthquake Forecasting,Institute of Earthquake Forecasting,China Earthquake Administration Beijing 100036,China;The First Monitoring Center,China Earthquake Administration,Tianjin 300180,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]中国地震局地震预测研究所地震预测重点实验室,北京100036 [2]中国地震局第一监测中心,天津300180 [3]中国地震局地球物理研究所,北京100081

出　　处：《武汉大学学报（信息科学版）》2018年第11期1688-1695,共8页Geomatics and Information Science of Wuhan University

基　　金：中国地震局地震预测研究所基本科研业务专项(2016IES0203);地震行业科研专项经费(201508010);川滇国家地震监测预报实验场(2018010227)~~

摘　　要：在经典的走滑位移公式的基础上进行改进,引入断层倾角信息,使其反映了走滑断层倾角对地表形变的影响。由于断层倾角的存在使得震间位移曲线的中心是以断层面闭锁-滑动分界在地表的投影为中心,并且此处形变变化最大;公式中的倾角项表示拟合的断层倾角,体现了断层出露地表处与断层闭锁-滑动分界的整体偏移,其值往往小于近地表倾角测量值。以改进的公式作为断层剖面分析的拟合公式,应用于汶川地震前后川滇块体东边界主要走滑断裂形变特征的剖面分析研究中,得到的拟合结果与其他方法得到的结果具有较好的一致性。改进公式比原公式更客观地反映了断层的形变状态,但由于针对单条断层的剖面拟合受多种因素的影响,拟合结果需结合实际情况作进一步分析。Fault dip angle is introduced to reflect the impact of surface displacement of strike-slip dip angle based on classic strike-slip displacement formula.Due to the dip angle of the fault,surface projection is the interface between locking and sliding motion on the fault,where deformation varies greatly.The dip term in the formula represents the fitting dip angle,which represents the overall offset of the surface and the locking-sliding boundary on the fault,and its value is often smaller than the near-surface measurement of dip angle.It was applied in the profile analysis of the main strike-slip fault deformation characteristics of the eastern boundary of the Sichuan-Yunnan block before and after the Wenchuan earthquake by using the improved formula as the fitting formula of the fault profile analysis.The fitting results obtained are consistent with those obtained by other methods.The improved formula reflects the deformation of the fault more objectively than the original one.Because the profile analysis for a single fault is affected by many factors,the fitting results have to be further analyzed in actual situations.

关 键 词：震间形变 走滑断层 断层倾角 川滇块体东边界 

分 类 号：P542[天文地球—构造地质学]