Abstract: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.
GUAN Yiliang,ZHANG Ling,LI Xiliang et al. Research on Geomagnetic Transfer Function and Induction Vector Characteristics in Shandong Province[J]. jgg, 2022, 42(8): 777-782.