论文部分内容阅读
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７０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滑为主，伴有一定的左旋扭动。并讨论了山前断裂的闭锁条件
According to the author’s field seismic geological survey, starting from the characteristics of geologic structure and tectonic stress field in the earthquake area, according to the Coulomb-Moiré-Shear rupture criterion, combining with the comprehensive analysis of the surface damage characteristics and the contour features of the contour line It is considered that the 7.00 earthquake in Lijiang is the result of the active fault in front of the Yulong Snow Mountain under the action of the principal compressive stress from North and West to near the north and south. The faulting is dominated by the dip-slip event with some left-handed twist. The conditions for the closure of the piedmont fault are discussed