摘要
安德逊理论表明地震的共轭破裂现象可以用库仑准则解释,断层面夹角与地下岩石内摩擦系数之间存在简单的定量关系。基于本文提出的通过共轭地震计算介质内摩擦系数的方法,对国内外19个具有X形或不完整的X形(L形)共轭破裂特征的地震进行系统性分析,与震源机制、区域应力轴方向等资料进行对比,确定共轭断层面,进而确定共轭面夹角并计算岩石的内摩擦系数。研究结果进一步证实了天然地震的共轭破裂与实验室岩石破裂具有较好的一致性,给出了库仑准则与安德逊理论在大尺度下也成立的证据,表明通过共轭角确定地下介质的内摩擦系数是对地下介质特性认知的有益补充。
Anderson’s theory indicates that the conjugate rupture phenomenon of earthquake can be explained by Coulomb’s criterion,and there is a simple quantitative relationship between the angle of fault plane and the friction coefficient of underground rock.Based on the author’s method of calculating the friction coefficient of the medium through conjugate earthquakes,this paper systematically analyzes 19 domestic and foreign earthquakes with X-shaped or incomplete X-shaped(L-shaped)conjugate rupture characteristics.Analyze and compare with the source mechanism,regional stress axis direction and other data to determine the conjugate fault plane,and then determine the angle of the conjugate plane and calculate the internal friction coefficient of the rock.The research results further confirm that the conjugate fracture of natural earthquakes is in good agreement with the laboratory rock fracture,and the Coulomb criterion and Anderson theory are also valid at large scales.It is shown that the internal friction of the underground medium is determined by the conjugate angle.The coefficient is a useful supplement to the cognition of the characteristics of the underground medium.
作者
王安简
陈运泰
Wang Anjian;Chen Yun-tai(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地震学报》
CSCD
北大核心
2022年第6期980-997,共18页
Acta Seismologica Sinica
基金
国家自然科学基金项目(41374069)资助.
关键词
共轭地震
库仑破裂准则
内摩擦系数
地壳介质
震源机制
conjugate earthquake
Coulomb failure criterion
inner friction coefficient
crustal medium
focal mechanism
