GREY INCIDENCE ANALYSIS OF FACTORS AFFECTING ISOSEISMAL AREA

In this paper, several subsystems are formed according to the intensity level and the degrees of active fault intersection respectively in earthquake disaster areas by grey system theory and 37 earthquake records of Yunnan province. In every subsystem, the isoseismal area, the magnitude, focal depths and the level of the active fault intersection have been recognized as the referring series and comparing series respectively. Then, the grey incidence analysis of the factors affecting isoseismal area and the order of incidence have been made. The results have shown the relation between the isoseismal area and factors affecting it, such as the magnitude, focal depths and level of the active fault intersection, and provided a basis of the future research for the quantitative estimation of the isoseismal area.