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丽江7.0级地震的地震地质构造背景分析
引用本文:周光全,张建国.丽江7.0级地震的地震地质构造背景分析[J].地震研究,1997,20(1):92-100.
作者姓名:周光全  张建国
作者单位:云南省地震局
摘    要:本文主要根据作者的野外地震地质调查,从震区地质构造条件与构造应力场特征出发,根据库仑-莫尔剪破裂准则计算,结合这次地震地表破坏特征和等烈度线形态特征综合分析认为,在北北西至近南北向主压应力作用下,丽江7.0级地震是玉龙雪山山前断裂活动的结果,地震时断层活动以倾为主,伴有一定的左旋扭动。并讨论了山前断裂的闭锁条件。

关 键 词:地震  地震地质  构造背景

ANLYSIS ON SESIMOLOGICAL TECTONIC BACKGROUND OF THE M 7 0 LIJIANG EARTHQUAKE
Zhou Guangquan,Zhang Jianguo,Zhou Ruiqi,Wu Boqian and Wang Guilan.ANLYSIS ON SESIMOLOGICAL TECTONIC BACKGROUND OF THE M 7 0 LIJIANG EARTHQUAKE[J].Journal of Seismological Research,1997,20(1):92-100.
Authors:Zhou Guangquan  Zhang Jianguo  Zhou Ruiqi  Wu Boqian and Wang Guilan
Abstract:Starting from the geoloical tectonic conditions and the features of tectonic stress field in the seismic area, on the basis of the field seismogelogogical survey made by the authous and the calculation using Coulomb-Mohr failure criterion, the autous, through comprehensive analysis in combination with surface damage features and the forms of coseismic line for the earthquake, think that the M 7 0 Lijiang earthquae is a result of the activity of the piedmont fault of Yulong snow mountain under action of principal pressure stress in NNW-near NS; the fault activity in the eartquake took dip-slip as dominant, accompanying some left-lateral torsion movment And also, the locked conditions of the piedmont fault are discussed in the paper
Keywords:Seismotectonics  surface damage  dip-slip fault  wrench fault  macroseismic intensity survey  M 7  0 Lijiang earthquake  Yunnan
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