摘要
本文根据Mandellrot提出的分维理论,对我国三次大震及四次震群活动的时间分维进行了研究,得到如下结论:1.时间分维的总体特征:大震前分维较低,震后分维升高。2.时间分维的动态变化特征:火震前的分维呈现一总趋势的降维过程,且幅度较大;而震群的时间分维变化较平稳。3.对同一地震序列,起始震级愈低,计算出的分维值愈高;起始震级愈高,计算出的分维值愈低。笔者认为,地震序列起止时间的选取对计算时间分维会产生较大影响。
Based on the fractal dimension theory suggested by Mandellrot, the cha-racteristic; of temporal fractal dimension of the three earthquakes and the four swarms in China are studied and some results are obtained as follows. 1 . In general, the fractal dimension is lower before the occurrence of the large earthquake than after.2.For the dynamic variation of the temporal fractal dimension, the temporal fractal dimension before the occurrence of the large earthquake drops within a great range, and the variations of temporal fractal dimension are relatively stable before and after the occurrence of the swarms. 3 . For same earthquake sequence, the smaller the magnitude of the initial earthquake is, the larger the fractal dimension of the sequence is, and conversely, it is also true. Author thinks that how to determine the beginning and the end may have a considerable effect on temporal fractal dimension.
出处
《地震研究》
CSCD
北大核心
1993年第3期229-238,共10页
Journal of Seismological Research
关键词
分维
大震
震群
中国
地震
fractal dimension, Large earthquake, Swarm, China
