山东省地磁转换函数和感应矢量特征研究  

Research on Geomagnetic Transfer Function and Induction Vector Characteristics in Shandong Province

作　　者：管贻亮 张玲[1] 李希亮[1] 董晓娜[1] GUAN Yiliang;ZHANG Ling;LI Xiliang;DONG Xiaona(Shandong Earthquake Agency,2066 Gangxi Road,Ji’nan 250100,China)

机构地区：[1]山东省地震局,济南市250100

出　　处：《大地测量与地球动力学》2022年第8期777-782,789,共7页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH20062);山东省地震局科研基金(JJ1803Y)。

摘　　要：为研究山东省地磁感应矢量特征及其构造指示意义,对山东省地磁台阵15个台站的数据进行函数转换和感应矢量计算。频域曲线显示,大部分台站的转换函数和感应矢量随周期变化平稳,山东省地下电性结构的横向差异随深度变化不大,稳定性较好,基本构造格局未随深度发生较大变化。位于鲁西隆起的济宁地区在40~80 min周期内的电流聚集方向发生180°转折,说明该深度在NE方向上存在较大范围的高导区。确立60 d窗长为最优逐日滑动计算参数,时频分析结果显示,转换函数具有1 a周期的变化特征,季节性变化明显,且转换函数A的稳定性优于B,更适合进行时移分析。感应矢量结果显示,沂沭断裂带为显著的电性分界面,其两侧的胶东隆起和鲁西隆起具有明显的电性差异,鲁西隆起区内的横向电性结构差异较小,而断层内部结构复杂,转换函数无明显的变化特征。To analyze the characteristics of geomagnetic induction vector and its structural implications in Shandong province, we calculate the transfer function and induction vector of 15 stations. The frequency domain curves show that the transfer function and induction vector of most stations change smoothly with period. The relative difference in electrical structure is not obvious with depth, and the underground electrical structure is stable based on the comparative analysis of each frequency band. The result suggests that the basic tectonic framework does not change with the depth. The current aggregation direction in 40 to 80 min band of Ji’ning in Luxi uplift takes a new turn of 180°, indicating that there is a large-scale high conductivity zone in this depth range. The study establishes the optimal window length(N=60 d) of daily sliding. Time series analysis shows that the transfer function has obvious 1 a cyclical characteristics, with obvious seasonal changes. Furthermore, the stability of the transfer function A is better than that of B, which is more suitable for time-lapse analysis. The induction vector results reveal that Yishu fault is an obvious electrical interface, and the electrical properties of Jiaodong uplift and Luxi uplift are quite different. The lateral electrical structure in the Luxi uplift area is not obvious. The internal structure of the Yishu fault is complex, and the transfer function has no significant change characteristics.

关 键 词：地磁台阵 转换函数 感应矢量 电性结构 

分 类 号：P318[天文地球—固体地球物理学] P315[天文地球—地球物理学]