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逆冲型断裂同震地表变形定量分析的几个问题——以汶川M_S8.0地震为例
引用本文:陈桂华,李峰,郑荣章,徐锡伟,于贵华,闻学泽,安艳芬,李陈侠.逆冲型断裂同震地表变形定量分析的几个问题——以汶川M_S8.0地震为例[J].地震地质,2008,30(3):674-682.
作者姓名:陈桂华  李峰  郑荣章  徐锡伟  于贵华  闻学泽  安艳芬  李陈侠
作者单位:1. 中国地震局地质研究所,国家地震活动断层研究中心,北京,100029
2. 中国地震局地质研究所,国家地震活动断层研究中心,北京,100029;中国地震灾害防御中心,北京,100029
3. 四川省地震局,成都,610041
基金项目:中国地震局地质研究所基本科研业务专项,国家重点基础研究发展计划(973计划),中国地震局汶川8.0级地震应急科学考察项目
摘    要:2008年5月12日四川汶川发生MS8.0地震,发震断裂在地表形成以逆断为主的破裂变形带。同震地表变形带的定量分析对理解地震的构造行为具有重要意义。文中以汶川地震典型调查点为例探讨了逆断型同震地表破裂变形带测量分析中值得重视并容易误解的几个问题,分析了地貌面标志和线性标志等测量数据与构造变形参数的几何关系,给出了变形参数的求解方法和相互关系。同时,就多观测点的定量数据在区域断裂几何结构变化和运动学分析中的运用进行了讨论

关 键 词:汶川MS8.0地震  同震地表破裂  逆断层  变形测量  地貌标志
收稿时间:2008-09-18

SEVERAL ISSUES IN THE QUANTITATIVE ANALYSIS OF CO-SEISMIC SURFACE RUPTURE PRODUCED BY REVERSE FAULTS:A CASE STUDY FROM THE 2008 WENCHUAN EARTHQUAKE
CHEN Gui-hua,LI Feng,ZHENG Rong-zhang,XU Xi-wei,YU Gui-hua,WEN Xue-ze,AN Yan-fen,LI Chen-xia.SEVERAL ISSUES IN THE QUANTITATIVE ANALYSIS OF CO-SEISMIC SURFACE RUPTURE PRODUCED BY REVERSE FAULTS:A CASE STUDY FROM THE 2008 WENCHUAN EARTHQUAKE[J].Seismology and Geology,2008,30(3):674-682.
Authors:CHEN Gui-hua  LI Feng  ZHENG Rong-zhang  XU Xi-wei  YU Gui-hua  WEN Xue-ze  AN Yan-fen  LI Chen-xia
Abstract:The Wenchuan earthquake(MS=8.0)of May 12,2008 in Sichuan Province,China produced surface ruptures along the seismogenic reverse faults.It is very important to analyze the co-seismic surface ruptures quantitatively for the comprehension of tectonic behavior of the great earthquake.We discuss several issues about the quantitative analysis of co-seismic surface ruptures produced by reverse faults with some examples from Wenchuan earthquake.With the geometric relations between the parameters of deformation and survey data from planar and linear geomorphologic benchmark,solution methods for those parameters are provided.The vertical slip,horizontal dip-slip and dip angles on survey profiles were measured to calculate the actual deformation of the fault.The relationship between the apparent deformation and the real value was provided quantitatively for oblique profiles and linear benchmarks.We also made some discussions on the application of the survey data to the analysis of regional structural geometry and kinematics.
Keywords:MS8  0 Wenchuan earthquake  co-seismic surface rupture  reverse fault  deformation survey  geomorphologic benchmark
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