地震不稳定性的一个简单模型

doi:10.3969/j.issn.1001-4683.2009.03.005

CORC > 北京大学 > 工学院

	地震不稳定性的一个简单模型; A Simply Model for Earthquake Instability
	李平恩 ; 殷有泉
刊名	中国地震
	2009
关键词	关键词:地震不稳定性断层破裂 Weibull分布断层本构关系平衡路径曲线应力突跳 Earthquake instability Fault rupture Weibull distribution Fault constitutive relation Equilibrium path curve Stress jump
DOI	10.3969/j.issn.1001-4683.2009.03.005
英文摘要	基于断层面强度的非均匀性,将断层面的宏观破裂过程看作是断面局部微元的破裂累积过程,假设断层局部微元强度遵循Weibull概率分布,从统计力学角度推导出了宏观的断层载荷.变形的全过程本构关系.采用一维地震力学模型,以远场位移a为控制变量,用稳定性理论研究了地震不稳定性问题.研究表明,系统刚度比(围岩刚度与断层刚度之比)β是影响地震发生的重要参数,只有当β<1时才会出现地震失稳,且应力突跳发生在平衡路径曲线的位移转向点,并给出了地震过程的3个重要参数(地震后断层半错距、地震应力降和释放的弹性能)的表达式.当β≥1时,不会发生地震,仅是缓慢的断层滑动,属于无震滑动.; In terms of the heterogeneity of fault plane strength, the macro rupture process of fault plane can be treated as the rupture accumulation process of local micro elements in fault surface. Assuming the strength of fault local micro elements follows Weibull probability distribution, the macro fault constitutive relation of load-deformation complete process can be derived from statistical mechanics viewpoint. Applying one dimension earthquake mechanics model and using far filed displacement a as control variables, the problem of earthquake instability is investigated by employing stability theory in this paper. The results show that system stiffness ratio (stiffness ratio of fault to surrounding rock)β is the important parameter to affect earthquake occurrence. The earthquake instability occurs only when β <1, and the stress jump appears at the displacement turning point of equilibrium path curve. The expression of three important parameters for earthquake (fault half-dislocation after earthquake, earthquake stress drop and elastic energy release) are also given. When β≥1, earthquake does not occur and fault only slips slowly without an earthquake.; 中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; 3; 265-273; 25
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/243706]
专题	工学院
推荐引用方式 GB/T 7714	李平恩,殷有泉. 地震不稳定性的一个简单模型, A Simply Model for Earthquake Instability[J]. 中国地震,2009.
APA	李平恩,&殷有泉.(2009).地震不稳定性的一个简单模型.中国地震.
MLA	李平恩,et al."地震不稳定性的一个简单模型".中国地震 (2009).