新沂台与马陵山台地电暴变化特征对比分析与讨论

Comparative Analysis of the Variation Characteristics of Geoelectric Storm at Xinyi and Malingshan Seismic Station

本文用FFT滤波残差方法和时序叠加残差方法,并结合地磁场观测资料,分析讨论了江苏新沂台、山东马陵山台记录的地电暴变化。结果显示:(1)当磁暴扰动剧烈时,新沂台和马陵山台均可以清晰地记录到地电暴的完整变化。(2)在发生磁暴时,地电场与地磁场的相关性明显降低,且不同台、不同测向之间的变化幅度也不尽相同,各向异性变化明显。(3)总体上看,新沂台东分量Ey日变幅增大变化超过马陵山台。我们认为,引起地电暴变化幅度差异的主要原因,可能与两台地下介质构造、裂隙的发育和走向不同以及台址浅表层、深层的电阻率差异性有关。

In this paper, we used the methods of FFT filter residual and time sequence superimposing residual, and combining with geomagnetic field, and analyzed and discuseed the changes of geolectric storm at the two stations Xinyi of Jiangsu and Malingshan of Shandong. We got the following results： ① When the intensity of disturbance is intense in geomagnetic storm, it can be more clearly recorded to the corresponding complete form in geoelectric storm at the two stations.② During the geomagnetic storm, correspondence decreased obviously between geoelectric field and geomagnetic field, and the change ranges varies in different stations, with different direcation. The variability of anisotropy is obvious.③ On the whole, the daily range incremental of EY at Xinyi station is more than Malingshan station. We think the cause of gelectric storm may be different for the reasons of the diurnal variation, ground medium structures and fractures, and the different shallow-and deep resistivity