江苏地电台站渗流方位角和极化方位角差异特征分析研究

Analysis of Difference Characteristics between Polarization and Seepage Angle in Jiangsu Geoelectric Field Stations

利用江苏地电台站的地电场和地磁数据,计算各个台站的极化方位角和渗流方位角,其中,渗流方位角分别采用谐波振幅和峰谷值2种方法进行计算,并对计算结果进行分析。结果表明:①新沂台和南京台由于台站覆盖层较浅,极化方位角存在线性极化和较多的非线性极化现象;而高邮台和海安台由于覆盖层较厚,极化方位角多数存在非线性极化现象。②用峰谷值法与用谐波振幅法计算所得的渗流方位角,两者相差不大,与理想模型间的差距也较小;而极化方位角与模型差距较大。因此,用渗流方位角尝试进行地震映震关系研究是基本可靠的。③高邮台的渗流方位角与高邮-宝应 M S4 . 9地震间具有较好的对应关系。

The geoelectric field and geomagnetic data of the Jiangsu seismic stations is used to calculate the polarization and seepage azimuth angle of each station in this paper. The azimuth angle is calculated by two methods:harmonic amplitude and peak and valley value. The results are compared and used to carry out the relationship analysis with earthquakes. The result shows that:(1)there is linear polarization and much nonlinear polarization phenomena in the polarization azimuth of the Xinyi seismic station and Nanjing seismic station because of the shallow cover layer of the stations,while the polarization angle of the Gaoyou and Hai′an stations are mostly nonlinear polarization phenomena,because of the thickness cover layer.(2)The difference of the seepage azimuth angle between the peak and valley method,and the harmonic amplitude method is small. The gap of the seepage azimuth angle between the ideal models is smaller than the polarization azimuth angle. Therefore,it is basically reliable to try to use the seepage azimuth to attempt the relationship with earthquakes.(3)The seepage azimuth of the Gaoyou seismic station has a good correspondence with the Gaoyou-Baoying M S4 . 9 earthquake.