基于小波变换对地磁场变化特征的分析

Research on Variation Characteristics of Geomagnetic Field Based on Wavelet Transform

摘要:

选用db5小波基函数对嘉峪关、兰州两个台站地磁垂直分量Z进行了小波分解,分析了不同台站间低频(概貌部分)和高频(细节部分)的相关性。结果显示:地磁Z分量在不同台站低频成分相关性较好,而高频部分相关性不明显,其高频部分可能与当地地下介质、地下电导率水平以及观测环境密切相关。

Abstract:

It is an important basic work to correctly identify the variation characteristics of the background field of the geomagnetic data. In this article, a wavelet decomposition was conducted to the geomagnetic vertical component Z of Jiayuguan station and Lanzhou station by using DB5 wavelet basis function, and then the relativity between low frequency (overview section) part and high frequency (detail section) part of two stations was analyzed. The results show that:the geomagnetic Z component between low frequency components of different stations are well related, while the correlation between high frequency components, which may be closely related to the local underground medium, underground conductivity and observation environment, is not obvious.