ZD8仪地电阻率整点值短临异常研究

Research on short-term and imminent integral point value anomaly of earth resistivity by using instrument ZD8

高精度的地电阻率测量其观测资料中有否短临地震前兆信息 ,为此分析处理了宝坻台ZD8地电仪自 1 987年 5月至 2 0 0 1年 3月的地电阻率整点值观测资料 ,分别对发生在宝坻台附近的中等地震和华北北部 5级以上地震前该项资料的短临前兆变化的对应情况和异常形态特征进行了全面的分析研究 ,结果表明该项资料的短临异常指标分别为 0 .5 %和 1 .0 % ,其预报效能的 R值分别为 0 .4和 0 .3 73。

In order to make sure whether the observed data through high precision earth resistivity measurement have the short term and imminent seismic precursor information, we analyzed the observed data, earth resistivity integral point value from May 1987 to March 2001, which observed by using earth electricity instrument ZD8 at Baodi seismic station. We conducted overall analysis and research on the short term and imminent precursor variation corresponding situation and anomaly pattern characteristic of the data obtained before moderately strong earthquakes occurred around Baodi seismic station and M ≥5 earthquakes occurred in North China. The results of research indicate that the short term and imminent index of anomaly data is 0.5 % and 1.0%. The forecast efficacy value R is 0.411 and 0.373, respectively.