青藏高原东北缘区域地电脉动能谱变化分析

发布时间：2018-03-22 15:07

  本文选题：地电脉动　切入点：频率　出处：《地震学报》2017年04期 　论文类型：期刊论文

【摘要】：基于我国青藏高原东北缘地区的5个地电场观测台站2015年以来的长时段地电场数据,首先使用求取两信号互相关函数的方法压制了大部分不相关电磁扰动,然后通过高通滤波和信号的频谱、自功率谱和互功率谱分析,得到了互相关分析后各台站的时频变化情况,结果显示在1Hz采样数据中10~(-3)—10~(-1)Hz部分可能含有地电脉动信号.同时通过对大武台原始数据进行小波变换分析,并将同时段地电场观测与相关频段的地磁场观测进行对比,结果表明,地球电场在该频段内表现出Pc3—5的特点,地电脉动成分占优势,且10~(-3)—10~(-1)Hz频段的能量较高,这一现象可能与地球磁层和电离层辐射波的稳定性有关.
[Abstract]:A long time in the northeastern margin of the Tibetan Plateau of China 5 geoelectric field observation stations since 2015 based on the field data, the first use of two methods to calculate the correlation function of the signal suppression of many related electromagnetic disturbance, and then through high pass filtering and spectrum signal, the power spectrum and cross power spectrum analysis, time-frequency the changes of each station are correlation analysis, the results showed that in 1Hz sampling data in 10~ (-3) - 10~ (-1) Hz may contain geoelectric pulse signals. At the same time, the wavelet transform analysis is carried out through the large Taiwan original data, and at the same time electric field observation and related frequency of geomagnetic observation comparison results show that the earth's electric field shows the characteristics of Pc3 - 5 in the frequency range, geoelectric ripple component is dominant, and the 10~ (-3) - 10~ (-1) Hz band high energy, this phenomenon may be related to the earth magnetosphere and ionosphere radiation The stability of the wave is related.

【作者单位】： 中国地震局兰州地震研究所;兰州地球物理国家野外科学观测研究站;广东省地震局;
【基金】：中国地震局国家局专项(ZX2017040);中国地震局地震科技星火计划(XH16037)联合资助 国家自然科学基金(41374080)
【分类号】：P315.722
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本文编号：1649176