摘要
本文选取了汾渭地震带从1970年至1989年二十年的地震资料,对所发生地震的时间分维结构进行了研究。文中分别以两个月为一个单位和一年为一个单位计算了时间分维数,绘出了每两个月D_t随时间t的变化曲线和二十年中每年D_t随t的变化曲线。经过计算发现,多数较强地震前D_t值明显降低,在大同一阳高地震中表现较明显,震前1988年的时间分维值为0.1944,1989年9月计算出的分维值为0.1312。
20 years of seismic data starting from 1970 to 1989 collected along the Fenwei seismic zone were selected for studying of the temporal fractal dimension (Dt) of the earthquakes occurred during the period. The temporal fractal dimensions were calculated in this paper respectively on 2-month and 1-year basis, and curves were plotted to show the Dt-variation dependent on time t in every 2 months as well as every year during the studied 20 years. The calculation shows that the Dt value drops obviously before most of the moderately-strong earthquakes, and this feature is most evidently revealed in the case of Datong-Yanggao earthquake. The temporal fractal dimension of the pre-shock in 1988 was calculated to be 0.1944, whereas that of September 1989 was 0.1312.
出处
《地震研究》
CSCD
北大核心
1992年第2期219-226,共8页
Journal of Seismological Research
关键词
地震带
发震
时间
分形维数
地震
Fractal
Temporal fractal dimension
Dimension reduction
