人民长江Issue(15)：69-73,5.DOI:10.16232/j.cnki.1001-4179.2015.15.017
地震地表破裂成因分析--以玉树地震为例
Cause analysis of seismic wave-induced surface ruptures:a case study of Yushu Earthquake
摘要
Abstract
Revealed by field investigations on four typical surface rupture observation spots in Yushu Earthquake, the surface ruptures can be divided into the following types: the co-seismic surface ruptures and gravity-induced ruptures formed after earthquake, such as the rear edge rupture of the landslide body and the rupture of the collapsed body on the river bank etc. Most co-seismic surface ruptures are triggered by fault dislocation and thus occur in seismogenic zone, whereas some surface ruptures does not coincide with the fault formations and thus are probably caused by other factors. As the relatively weak zone of the earth crest, the faults do not play the role of transferring energy so much as dissipating energy. The energy released by seismic source rupture is transmitted in the form of seismic waves through rather heterogeneous upper crust, undergoing the complex refraction and reflection when going through the faults, fissures, rock interfaces and folded surfaces of the earth crest. Subsequently, the seismic waves are superimposed and amplified in some weak sections to the extent and they eventually breakthrough the earth sur-face and release energy to cause co-seismic surface rupture. The process in which the seismic waves break through the earth surface and cause seismic ruptures can be defined as the formation of seismic wave-induced surface ruptures. Since the seismic waves carry the related information of seismogenic structures, the configuration of the seismic wave-induced surface ruptures is indicative to the basic features of seismogenic structures.关键词
地震地表破裂/地震波突出/成因分析/玉树地震Key words
seismic surface rupture/seismic wave breakthrough/cause/Yushu Earthquake分类
天文与地球科学引用本文复制引用
罗文行,钱莉莉,李德威,李茂华..地震地表破裂成因分析--以玉树地震为例[J].人民长江,2015,(15):69-73,5.基金项目
水利部国家大坝安全技术研究中心项目(2011NDS012) （2011NDS012）
中国地质调查局项目“汶川地震区岩体稳定性评价技术方法”(1212010914036) （1212010914036）
