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2010年玉树地震地表破裂带典型破裂样式及其构造意义
引用本文:孙鑫喆,徐锡伟,陈立春,谭锡斌,于贵华,李智敏,苏桂武,王继,张晓清.2010年玉树地震地表破裂带典型破裂样式及其构造意义[J].地球物理学报,2012,55(1):155-170.
作者姓名:孙鑫喆  徐锡伟  陈立春  谭锡斌  于贵华  李智敏  苏桂武  王继  张晓清
作者单位:1. 中国地震局地质研究所国家地震活断层研究中心, 北京 100029; 2. 青海省地震局, 西宁 810001; 3. 中国地震灾害防御中心, 北京 100029
基金项目:国家自然科学基金,中国地震局玉树地震科学考察项目资助
摘    要:野外调查表明,青海玉树MS7.1地震发生在青藏高原中部甘孜-玉树断裂的玉树段上,在玉树县结古镇至隆宝镇之间产生了一系列包括剪切破裂、张剪切破裂、压剪切破裂、张性破裂及其不连续岩桥区出现的鼓包或陷落坑(拉分盆地)、高寒地区特有的冰裂缝等地表破裂单元,它们斜列组合成整体走向约300°、长约65 km、最大同震左旋位移2.4 m的地表破裂带,具有变形局部化的基本特征.玉树地震地表破裂带整体上可划分为长约15 km的结隆次级地表破裂带和长约31 km的结古次级地表破裂带,两者呈左阶羽列,其间无地表破裂段长约17 km,对应于MW6.4和MW6.9两个次级地震事件.地表破裂类型、基本组合特征等显示出甘孜-玉树断裂两盘块体的运动方式以纯剪切的左旋走滑为主,从一个方面反映了青藏高原物质存在着向东的逃逸和挤出现象.

关 键 词:玉树地震  地震地表破裂带  甘孜-玉树断裂  逃逸构造  青藏高原  
收稿时间:2011-07-06

Surface rupture features of the 2010 Yushu earthquake and its tectonic implication
SUN Xin-Zhe , XU Xi-Wei , CHEN Li-Chun , TAN Xi-Bin , YU Gui-Hua , LI Zhi-Min , SU Gui-Wu , WANG Ji , ZHANG Xiao-Qing.Surface rupture features of the 2010 Yushu earthquake and its tectonic implication[J].Chinese Journal of Geophysics,2012,55(1):155-170.
Authors:SUN Xin-Zhe  XU Xi-Wei  CHEN Li-Chun  TAN Xi-Bin  YU Gui-Hua  LI Zhi-Min  SU Gui-Wu  WANG Ji  ZHANG Xiao-Qing
Institution:1. National Center for Active Fault Studies, Institute of Geology, China Earthquake Administration, Beijing 100029, China; 2. Earthquake Administration of Qinghai Province, Xining 810001, China; 3. China Earthquake Disaster Prevention Center, Beijing 100029, China
Abstract:Field investigations show that the Yushu,Qinghai Province,MS7.1 earthquake occurred on the Yushu segment of the Ganzê-Yushu fault in the Qinghai-Tibetan Plateau.Its surface rupture zone is distributed along the Yushu segment between Longbao Town and Jiegu Town and consists of shear cracks,transtensional cracks,transpressional cracks,tension cracks,mole tracks in right-stepovers or small pull-aparts in left-stepovers between en echelon cracks with left-lateral component.Those ruptures are en echelon to form an ~300°-striking earthquake surface rupture zone with a total length of about 65 km.The maximum co-seismic left-lateral displacement is 2.4 m.The width of the surface rupture zone is in general less than 30 m,showing a localized rupturing feature.The Yushu earthquake surface rupture zone can be divided into two relatively independent sections in left-step: the Jielong section ~15 km long with a maximum left-lateral slip of 0.66 m and Jiegu section ~ 31 km with a maximum left-lateral slip of 2.4 m,and between them is a 17 km-long-section where no surface ruptures occurred,which correspond to two subevents with MW6.4 and MW6.9,respectively.This kind of the surface rupture pattern shows that the Ganzê-Yushu fault,a seismogenic fault of the Yushu earthquake,is dominated by a pure left-lateral faulting and the eastward escape of the Qinghai-Tibetan Plateau exists.
Keywords:Yushu Earthquake  Earthquake surface rupture zone  Ganzê-Yushu fault  Escape tectonics  Qinghai-Tibetan Plateau
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