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汶川M_S 8.0地震地表破裂带北端位置的修订
引用本文:李传友,魏占玉.汶川M_S 8.0地震地表破裂带北端位置的修订[J].地震地质,2009,31(1):1-8.
作者姓名:李传友  魏占玉
作者单位: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
基金项目:中国地震局汶川8.0级地震科学考察项目,国家自然科学基金,中国地震局地质研究所基本科研业务专项基金 
摘    要:对汶川MS8.0地震地表破裂石坎乡以北段的野外地质调查显示,这一段地表破裂仍然十分明显。地表破裂并未沿地质填图所标定的位置发育,而是在走向上稍有变化,但清楚的地貌显示它在此段并不是一条新生断裂。与前期工作相比,可观察到的地表破裂又往NE方向延长了约12km。该段破裂位于平武县石坎乡至青川县马公乡窝前村之间,走向为15°~45°,运动学性质主要为右旋走滑逆冲。地震地表破裂显示的同震垂直位移与石坎乡一带相近,为1~2m左右;右旋水平位移略有增加,为2.0~3.0m之间。地表调查的情况显示,地表破裂在北端可能消失在红光乡东河口一带。

关 键 词:汶川地震  地表破裂  同震位移  破裂长度
收稿时间:2009-01-22

DEFORMATION STYLES OF THE NORTHERNMOST SURFACE RUPTURE ZONE OF THE M_S 8.0 WENCHUAN EARTHQUAKE
LI Chuan-you,WEI Zhan-yu.DEFORMATION STYLES OF THE NORTHERNMOST SURFACE RUPTURE ZONE OF THE M_S 8.0 WENCHUAN EARTHQUAKE[J].Seismology and Geology,2009,31(1):1-8.
Authors:LI Chuan-you  WEI Zhan-yu
Affiliation:National Center for Active Fault Studies;Institute of Geology;China Earthquake Administration;Beijing 100029;China
Abstract:Field investigations on the 2008 surface rupture north to Shikan village show that the surface rupture is still significant in this section.The surface rupture changes its strike at the north of the town of Shikan and does not follow the previously mapped thrust which was initially considered the location the rupture traversed.Nevertheless,clear morphological expressions suggest repeated coseismic displacements along the fault trace the 2008 earthquake rupture followed.Contrast to the previous work,another ...
Keywords:Wenchuan earthquake  surface rupture  coseismic displacement  length of rupture  
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