摘要
许多震例表明,地震可以形成于共轭破裂。地震震源处,其温度和压力与地壳浅处及地表不同,温、压越高,共轭破裂角越大,随着深度的变浅(温、压减小),地震共轭破裂角减小;高烈度等震线共轭角也减小。用数学力学方法和岩石力学实验结果,探讨了1976年盐源 宁蒗6 7和6 4级地震共轭破裂及极限主应力随地壳深度变化。
Many examples show that earthquakes can form conjugate ruptures.The temperature and pressure at the focus are different from that of the shallow part of crust and the ground.The higher temperature and pressure,the larger conjugate rupture angles.Accompanying decrease of depth,temperature and pressure become small and the conjugate rupture angles also become small and same as the conjugate angles of isoseismic lines on the ground and the tensile\|shear ruptures are near gound.Based on the method of mathmatical mechanics and the result of rock mechanic experiments,variation of the conjugate ruptures of the Yanyuan\|Ninglang earthquake and its limiting principal stresses with the depth of crust is discussed.
出处
《地质力学学报》
CSCD
2003年第2期161-170,共10页
Journal of Geomechanics
基金
地震科学联合基金资助课题(198046)
中国地震局地壳应力研究所论著号:2003B0003
关键词
盐源-宁蒗地震
共轭破裂
极限主应力
共轭等震线
烈度
断裂
conjugate ruptures
conjugate rupture angles
conjugate isoseismal lines
limiting principal stresses
