摘要
一引言通过数学物理实验方法,建立简化而实际的地震模型,来重现地震活动的基本规律,目前这方面的研究成果已有很多。如滑块模型、细胞自动机模型、非弹性单元(元件)模型等,并得到了一些有意义的结论和认识,如较好地解释了Gutenberg-Richter公式所表示的震级与频度关系及大震发生的时间间隔等。但模型的细胞(或单元)基于数学或物理假定被赋予假定的尺度与阈值,失稳条件完全依赖指定的阈值,并假定失稳后能量均匀传递给四周,这些假定也没有更多的考虑真实的震源物理规律及震源介质力学参数,因而许多结果缺少直接明朗的物理意义。
Nonlinear dynamics applied to earthquake modelling has become an important research direction in recent years. The earthquake "quanta" model proposed by I. S. Sacks (Sacks et al., 1995) has made significant achievements in this field. The research achievements of fault mechanics and the real failure criteria of rock mechanics have been adopted in the model. The simulation result of the model possesses distinct physical implications. It explains not only the Gutenberg-Richter magnitude-frequency linear relation, but also the relatively constant stress drop for earthquakes with large magnitude. It also reasonably explains the law of slip rise time and rupture propagation during seismic faulting. Based on above-mentioned model, in this paper we have simulated the dilatancy-permeation process, our results reasonably explain faultgenerated earthquake process.
出处
《地壳构造与地壳应力文集》
2000年第1期114-119,共6页
Bulletin of the Institute of Crustal Dynamics
