莲花等三台风的地磁效应与“第三类脉动”有关吗?  

Is the "Third microseisms" related with the geomagnetic effect of Linfa and other three typhoons?

作　　者：吴琼[1] 胡小刚[2] 郝晓光[2] 滕云田[1] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]中国科学院测量与地球物理研究所,武汉430077

出　　处：《地球物理学进展》2011年第4期1186-1196,共11页Progress in Geophysics

基　　金：质检公益性行业科研专项基金(10-215);国家科技支撑计划项目(2008BAC35B05)联合资助

摘　　要：本文利用经验模态分解的噪声水平曲线提取算法,研究了国内地磁台站记录到的莲花、莫拉克和茉莉等台风的地磁效应数据.结果表明:Z分量特征频率为0.05～0.2 Hz的IMF信号噪声水平曲线在时间上稳定反应了台风活动性,而值得注意的是,台风主要影响较远距离地磁台站相对记录的噪声水平曲线.这种"远大近小"的地磁效应模式,可能与作者最近提出的关于"第三类脉动"的猜测有关.The curve of the noise level is extracted by Experiment Mode Decomposition, and the geomagnetic effect of typhoon Linfa,MORAKOT,Melor are studied. The IMF signal of the Z-component in geomagnetic records which has the characteristic frequency 0.05-0.2 Hz reflects the activity of these typhoon stably. And more important is that typhoon mainly affects the distant observatory＇s curve of noise level. This kind of impact model may be relate with the ＂Third microseisms＂ proposed by us recently.

关 键 词：台风 噪声水平曲线 地磁效应 经验模态分解 

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