摘要
研究了江苏及邻区 1970年以来 5 5级以上地震的多重分形特征 ,着重用推广GP法研究了地震前后多重分形的广义维数谱Dq 和奇异性谱f (a)。研究结果表明 :所有震例的广义维数谱和奇异性谱均经历了远离地震时、异常出现时和异常消失时的三个特征变化阶段 ;异常出现的时间在震前半年至一年半内 ;多数震例异常在震前几个月内回返恢复 ,少数在震后数个月内恢复。
The multi-fractal characteristics of small earthquake time series for the four earthquake examples( M S≥5 5)since 1970 in Jiangsu province and adjacent areas are studied in this paper.It is indicated that the generalized fractal dimension spectrum D q and singularity spectrum f(a) of all examples have three variation stages which separately corresponded to the time far before the earthquake,the time when abnormity appeared and the time when abnormity disappeared;The time when abnormity appeared was one year to one and half years before the earthquake;the abnormity came back several months before the earthquakes for most examples and several months after the earthquake for one example.The above results show that it is significant to apply the multi-fractal characteristics to mid-strong earthquake prediction in one year to one and half year scale in this area.
出处
《地震研究》
CSCD
北大核心
2002年第3期257-261,共5页
Journal of Seismological Research
