【摘要】 将重标极差法(R/S,Rescaled range analysis)这一时间序列分析方法引入到地震地磁前兆观测资料的处理和分析当中,并应用该方法对陕西关中地区3个地磁台站在1996~1998年间Z分量观测数据进行处理。分析了地磁Z分量赫斯特指数变化与1998年1月5日泾阳MS4.8地震的关系,发现地震前2~4个月地磁Z分量出现明显小于0.5的异常变化,背离了地磁场正常的长程相关趋势性增强的变化规律,预示了此次地震的发生。这些结果表明该方法能够挖掘出丰富的地磁前兆信息,在地震前兆观测资料的非线性处理中具有良好的应用前景。更多还原

【Abstract】 The rescaled range analysis which is a method of time series analysis introduced into process and analysis of geomagnetic data.Using this method,the mean daily values of vertical component of geomagnetic field at the Jingyang,Qianling and Zhouzhi geomagnetic stations in the Guangzhong region during 1996～1998 are processed,to analysis the relationship between variations of Hurst exponent of Z component and the Jingyang M_S4.8 earthquake occurred on January 5,1998.2～4 months before the earthquakes,the Hurst exponent of Z components at the Jiangyang and Qianling station is less than 0.5,deviating from the normal variation of the long distance correlativity with an enhanced trend and foreshowing earthquake’s occurrence.Those results indicate that the R/S analysis method can extract useful seismomagnetic precursor,and has potential and prospect in the nonlinear processing of seismic precursory observational data.更多还原