摘要
应用分数维理论与方法，对地震活动时间分布不均匀结构，建立自相似分形集。利用其相似维数Ｄ的变化特征，来研究辽宁省中强地震前后和显著地震活动的时间结构。发现中强地震前Ｄ值随时间系统减小，余震序列的Ｄ值变大，前震序列的Ｄ值明显偏低。对震群活动的研究表明，一般震群活动的Ｄ值均较高，而前兆震群活动的Ｄ值也明显偏低。
This paper studies the temporal fractal structure of seismicity by meansof the frectal theory and method. We analysed characteristics of time fractal dimension D for moderately strong earth-quake sequences in Liaoning province. The resulte shows that there is tendency for D value todecreose astime goes on before the earthquake. D value of foreshock sequence of Haichengearthquake is relative lower,and after;hock sequence has high D value. D values of premoni-tory svvarms are lower then general no-premonitory swarms.
出处
《防灾减灾学报》
1995年第1期7-12,共6页
Journal of Disaster Prevention And Reduction
关键词
分数维
自相似
分形
Fraltal dimension
Self-similarity
Fractal
