ZD8仪地电阻率整点值短临异常研究

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1987年5月至2001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. 373。

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

Inorder tomake sure whether the observed data th rough high precisionearth 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 Baodiseismic station. We conducted overall analysis and re search on the short-term and imminent precursor variation corresponding situation and anomaly pattern characteristic of the data obtained before moderately strong earthquakes occurred a round Bao diseismic station and M≥ 5 earthquakes occurred in North China. The results of re search indicate that the short-term and imminent index of anomaly data is 0. 5% and 1. 0%. The forecast efficacy value Ris 0. 411 and 0. 373, respectively.