北京及邻区地磁总场频谱的分析研究
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摘要
应用北京及邻区2min采样的地磁总场观测资料,分析了北京台与各临时台地磁总场的频谱特性与频谱幅比的时空变化。结果显示,该地区地磁总场的频谱幅度随周期增大呈下降趋势;各临时台与北京台的频谱幅比具有一定的时空变化,可能与该地区地下电磁结构、地震及构造活动有关。
Based on the data of 2 min geomagnetic total field observation in Beijing and its adjacent areas,the frequency spectrum characteristic and the time-space variation of amplitude ratio of frequency spectrum for Beijing station and other 11 temporal stations are analyzed.The results show that the spectrum amplitude of geomagnetic total field in this area appears decreasing tendency with the increasing of period.The amplitude ratio of spectrum between temporal stations and Beijing station varies with time-space changes,which may be related to the underground electromagnetic structures,earthquakes and tectonic activities in this area.
Based on the data of 2 min geomagnetic total field observation in Beijing and its adjacent areas,the frequency spectrum characteristic and the time-space variation of amplitude ratio of frequency spectrum for Beijing station and other 11 temporal stations are analyzed.The results show that the spectrum amplitude of geomagnetic total field in this area appears decreasing tendency with the increasing of period.The amplitude ratio of spectrum between temporal stations and Beijing station varies with time-space changes,which may be related to the underground electromagnetic structures,earthquakes and tectonic activities in this area.
引文
中国地震局地球物理研究所论著 :0 4AC1 0 2 8.
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[1] 詹志佳,姚富鑫,Johnston,等.中美地磁总强度日变化的分析比较[J].地震学报,1992,14(1):83-89
[2] 付承义,陈运泰,祁贵仲.地球物理学基础[M].北京:科学出版社,1985.
[3] RikitakeT,HonkuraY.SolidEarthGeomagnetism[M].Tokyo,Japan:TerraScientificPublishing,1985.
[4] 祁贵仲,詹志佳,侯作中,等.渤海地区地磁短周期变化异常—上地幔高导层的分布及其与唐山地震的关系[J].中国科学,1981,(7):869-879.
[5]詹志佳,高金田,张玉敏,等.唐山地震前后地磁场短期周期变化的分析[J].地震研究,1987,10(2):247-257.
[6] BeamiskDA.Geomagneticprecusorto1979Carlisteearthquake[J].Geophys.J.R.Astr.Soc.,1982,68(2):531-543.
[7]祁贵仲,候作中,范国华,等.地震的感应磁效应(2)[J].地球物理学报,1981,24:296-309.
[8] JohnstonM.Reviewofelectricandmagneticfieldsaccompanyingseismicandvolcanicactivity[J].SurveysinGeophysics,1997,18(1):441-475.
[9] ZhanZhijia,GaoJintian,ZhangHongli,etal..SeismomagneticsignalsobservedinChina[A].In:HayakawaM(ed.).AtmosphericandIonosphericElectromagneticPhenomenaAssociatedwithEarthquakes[C].Tokyo,Japan:TerraScientificPublishingCompany,1999.185-196.
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