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1983年菏泽5.9级地震前后小震频数及能量空间分布的分形特征
引用本文:蒋海昆.1983年菏泽5.9级地震前后小震频数及能量空间分布的分形特征[J].地震,1993(6):15-20.
作者姓名:蒋海昆
作者单位:山东省地震局
摘    要:本文对菏泽地震为例,从频数及能量两方面对地震不均匀空间颁的分形特征进行研究,并探讨其预报含义。结果表明,地震频数及地震能量空间分布均表现出统计意义上的自相似特征,并且前者的分布结构较后者列为复杂。菏泽地震前几年的“降维”中视为中期预报的一个显著指标,而动态均值则可作为判断“降维”的一个较好标准;t检验表明能量分布的降维较频数分布更为显著,并且其对中强地震孕育过程各阶段的反映似也列为灵敏,降维之后的

关 键 词:地震频数  地震能量  空间分布  震级

FRACTAL CHARACTERISTICS OF SPATIAL DISTRIBUTION OF SMALL-EARTHQUAKE FREQUENCY AND ENERGY AROUND HEZE EARTHQUAKE Ms = 5.9, 1983
Jiang Haikun.FRACTAL CHARACTERISTICS OF SPATIAL DISTRIBUTION OF SMALL-EARTHQUAKE FREQUENCY AND ENERGY AROUND HEZE EARTHQUAKE Ms = 5.9, 1983[J].Earthquake,1993(6):15-20.
Authors:Jiang Haikun
Institution:Seismological Bureau of Shandong Province
Abstract:This paper studied the fractal charateristics of the heterogeneously spatial distribution of earthquakes in Heze region from two aspects of frequency and energy as well as discussed its implication for earthquake prediction.The results reveal that the spatial distribution of both earthquake frequency and energy shows the self-similar features in statistical sense; and the distribution structure of the former is more complicated than chat of the latter. The "reduction of the dimensions" occurred several years before Heze earthquake can be regarded as an obvious index for the medium-term prediction, and the dynamic mean value can be taken as a better criterion in judging "reduction of the dimensions"; the t-test shows that "reduction of the dimensions" of the energy distribution is more obvious than that of the frequency distribution, and it seems to be more sensitive in reflecting various stages of the seismogenic process of moderate earthquakes. The trend rising after "reduction of dimensions" is probably the sign of an imminent seismic risk. When the retrospective tracing test is conducted and the difference between the dimensional increase and mean value reaches minimum, it can be considered that the earthquake prediction has entered the short-term and impending stages.This paper also preliminerily discussed other problems such as variation features of non-scaled regions of fractal structures. It is considered that the obvious variations of the information dimension and non-scaled regions indicate the larger and substantial 'change of the systematic state, the time of these obvious variations is mostly consistent with the starting-ending time of various seismological and precursory anomaly indices.
Keywords:spatial distribution of earthquake frequency and energy  fractal struc- ture  information dimension  dimensional reduction  change of scaling-range
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