唐山地震前兆场的分布特征

本文对唐山地震昌黎等七个台的地电阻率日均值时间序列进行了关联维计算．取每年为一个时间段，其目的在于探索分数维对地震各个阶段的反应，以便达到利用分数维进行地震预报的目的。计算结果表明大部分地电台的地电阻率在地震前有明显的降维特征。通过地震前后七个台的地电阻率分数维的变化，得到了地震前后前兆场的分布特征，这一结果对于未来震源区的判定有重要意义。

THE DISTRIBUTION CHARACTERISTICS OF PRECURSOR FIELD OF TANGSHAN EARTHQUAKE

In order to explore the temporary changes in fractal dimension of earth resistivity associated with earthquake prediction process,the fractal dimension of time sequence of daily mean values in resistivity observed at seven geoelectric stations around the epicenter of Tangshan earthquake with the time segment of one year were computerized in this paper. The results show that within a certain period of time before earthquake the fractal dimension in most of stations decrease obviously.So the distribution characteristics of precursor field before and after earthquake can be obtained by the changes of fractal dimension of earth resistivity,which shows the significance of these results in determining the potential source.