地电阻率的多年动态和中期异常判定方法的优化研究

Optimization for Multi-years Dynamic Change and Medium-term Anomaly Judgment of Ground Resistivity

叙述了地电阻率变化的主要影响因素和多年动态变化特征。根据地电阻率中期异常标志,研制了提取地电阻率强震中期异常的3种数学处理方法,对其方法的特点做了简要分析。以河北张北6.2级地震为例,应用所述3种方法,对河北昌黎台北南道地电阻率作了计算。结果表明,不同分析方法所得出的异常,彼此之间有较强的可比性,似可为地震综合预报提供一套有效的强震中期异常判定方法。

Main factors to influence ground resistivity variation and characteristics of multi-years dynamic change are introduced.Based on diagnostic values of medium-term anomaly of the ground resistivities,3 mathematical methods for extracting medium-term anomalies of the strong earthquake from ground resistivities are worked out.Brief introductions for the features of these 3 methods.Taking Zhangbei,Hebei,earthquake of M6.2 as an example,calculations of ground resistivities of N-S component of Changli Station,Hebei,are made by using all those 3 methods.The results show that there is better comparability among the anomalies got from different methods,which may be taken as a effective method for judging medium term anomalies of the strong earthquake in multi-disciplinary earthquake prediction.