摘要
对天津地区的静海、徐庄子和宝坻新台的3台GM4磁通门磁力仪数据进行了噪声的频谱分析。发现噪声的优势频段在0.001~0.02 Hz之内,其中主要的干扰频段在0.005~0.01 Hz,在主要干扰频段内的振幅谱幅值越高,跳点越多,跳值也越大。从功率谱上看,静海受干扰最明显,徐庄子次之,宝坻新台受影响很小;噪声越大,功率谱振幅在主要干扰频段内跃升越大,频段越宽,且功率谱降幅与干扰距有关,干扰距越小,降幅越小。
This paper analyzed noise spectrum from GM4 magnetometers in Jinghai, Xuzhuangzi and Baodi stations. We found the dominant frequency noise was 0. 001 -0.02 Hz, and the major interference frequency was 0.005 - 0.01 Hz, the amplitude spectrum in the main interfering frequency was higher with more hops, the value of hop was greater, too. Considering the power spectrum, the most obvious interference was Jinghai while Xuzhuangzi followed, Baodi was little affected; The noise was greater, the power spectral amplitude was greater with main interfering frequency while band was wider, and decline of the power spectrum and interference distance was correlated： the smaller the interference distance was, the smaller decreasing ranges was.
出处
《内陆地震》
2015年第2期154-161,共8页
Inland Earthquake
关键词
天津
功率谱
振幅谱
噪声优势频率
地磁去扰
Power spectrum
Amplitude spectrum
Dominant frequency noise
Geomagnetic dis turbance
