孕震系统中的1/f噪声行为

THE 1 /f NOISE BEHAVIOUR IN SEISMOGENIC SYSTEM

根据自组织临界现象理论,研究7海城、唐山等7个大地震前、后中小地震的活动特征,计算了不同孕震时期地震活动的功率谱特征.初步结果表明描述地震活动的谱幂律指数p值在大震发生前有明显的增高倾向.主震前一年及主震当年,p值一般落在闪变噪声的谱域,其他时间一般很小.最后讨论了地震孕育的物理过程及孕震系统的稳定性.

<Abetract>In this paper the characteristics of the seismic activities for Haicheng, Tangshanand other regions are studied on the base of the S0C theory' Power spectra, in themeantime, for seismic activities mentioned above are als0 calculated during the differ-ent seismogenic process' Result shows that the values 0f the power law exponent Pdescribing seisAnc activity tend obviously to arise before 1arge earthquake occurrence-0ne year before mainshock and current year, the g values, in general, fall inside thelimits of spectra domain of nicker noise, and those of another time are all verysmall' Finally, seismogenic physical process and its stability are als0 discussed'