汶川地震地表变形特征  

Characters of surface deformation in Wenchuan earthquake

作　　者：姚大全[1] 张有林[1] 王行舟[1] 陈安国[1] 郑颖平[1] 李光[1] 

机构地区：[1]安徽省地震局,安徽合肥230031

出　　处：《自然灾害学报》2011年第6期181-184,共4页Journal of Natural Disasters

基　　金：地震行业科研专项(2008419064);安徽省科技攻关计划项目(08010302204)

摘　　要：汶川地震地表变形特征丰富多彩。在震后40天自北至南对地震地表变形现象进行了为期10天的专题考察和分析,对北川、擂鼓、汉旺、蓥华、白鹿、小鱼洞、虹口和映秀等8个断裂出露部位进行了重点剖析。结果表明,不同侧面,不同级次的现象均显示出统一的变形变位图案,但具体而言它们比理论模型、规例要复杂得多。它们具体表现为:沿汶川地震断裂面推挤形成隆起,产生纵向、横向裂隙;推挤前缘冲断塌落,形成逆断型崩积楔;多方向挤压、或引张,显示同一应力作用下变形组合的复杂性。这些均不同程度地丰富了现有的应力作用理论。The earth＇s surface deformation characters of Wenchuan earthquake are rich and colorful.After 40 days from the earthquake occurrence,the authors put through a special subject investigation and analysis of the earth＇s surface deformation phenomena from the north the south,and anatomized emphatically the 8 fault crop-out such as,Beichuan,Leigu,Hanwang,Yinghua,Bailu,Xiaoyudong,Hongkou and Yingxiu.The results show an uniform deformation and dislocation pattern for different sides and grades phenomena,but the situation is much more complex than theoretic models and rule.It shows that upheaval is formed along Wenchuan seismic fault plane jostling,lengthways and cross cracks are formed,the compressed foreland crashes and collapses and forms thrust accumulation wedge bodies,compression or tension occurs in many directions in which show complexity of the deformation combination,these enrich the stress action theory in different degree.

关 键 词：汶川地震 地表变形 挤压 引张 

分 类 号：P315.725[天文地球—地震学]