THE SELF ORGANIZATION AND SIMILARITY OF INTRAPLATE SEISMIC ACTIVITY

It is pointed out that the two important expressions are used to describe the self- organization and self- similarity of intraplate seismic activity in the temporal domain in this paper. They are N("...?.-r)---r-p and N(--C.۰—td The first expression reveals that the temporal distribution of earthquakes is in accord with the fractal statistical model and is out of accord with the Poisson model; the second can be considered as a recurrence formula and a medium-term forecast method to predict strong earthquakes. The earthquake includes a lot of nonlinear phenomena. The temporal and spatial distribution patterns of intraplate seismic activity are very complicated and irregular.In earthquake predication, scientists always simplify and regularize the complex seicmic temporal and spatial distribution and premonitory abnormities, and suggest the definitive earthquake predication. In general, many approaches used are empirical in nature. If earthquaks were mutual independent random events in the temporal add spatial distribution or magnitude, the earthquake sequence would be considered as a random process. At present, random models (for example the Poisson model most in use) are adopted to analyze seismic hazards.[۴] In fact, seismic phenomena are characterized by both definition and random. A seismic active area is referred to as a open system with a complex boundary condition, and continually exchanges energy and material with its surroundung, there are the contact and restraint between the seismic active area and its surrounding. In the continental part of China and its neighbourhood, the events in succession are correlative, and their temporal and spatial distribution are very inhomogeneous under the action of the united regional stress field. The complex temporal and spatial distribution patterns and developing processes of seismic activity are regarded to as a self-organization phenomenon in a unbalanced system. The fractal geometry may be a useful tool to solve the complex self-organization and self-similarity.[۱][۲] The fractal dimension is a characteristic parameter to describe quantitatively the fractal and represents the ordered degree of