基于大地电场岩体裂隙水渗流模型的地震前兆异常特征研究

Study of the Characteristics on Earthquake Precursor Anomalies:Based on the Telluric Field Rock Crack Water Seepage Model

基于地电场潮汐波岩体裂隙水(电荷)渗流(移动)模型计算辽宁地区大地电场优势方位角α,并对比分析降雨、温度、磁暴等典型干扰对大地电场优势方位角α的影响程度。结果表明,大地电场优势方位角α受典型干扰的影响较小。结合2013-01-23辽宁灯塔M_(S)5.1地震前后优势方位角α的动态变化研究发现,多个同一或相邻地质构造地电场台站准同步的岩体裂隙电荷移动方位的长时间突变可认为是中强地震的前兆异常。

In this paper,based on the tidal wave of the telluric field,we establish a model of the seepage(movement)of the rock crack water(charge)seepage,and calculate the dominant azimuth angleαof the telluric field in Liaoning area.We make a comparative analysis on the degree of change of the dominant azimuth angleαof the telluric field that we combined with typical disturbances such as rainfall,temperature,and magnetic storms.The results show that the dominant azimuthαof the telluric field is limited by typical interference.Combined with the dynamic change of the dominant azimuthαbefore and after the 2013-01-23 Liaoning M_(S)5.1 earthquake,we find that the long-term sudden change of the charge movement direction of the rock mass fissures of the same or adjacent geological structure geoelectric field stations can be considered as the precursory anomaly of a moderately strong earthquake.