国际高精度地磁模型研究进展
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摘要
高精度地磁模型能详尽地反映地磁场在地面上的分布,具有较高的模型分辨率。在资源勘探、地质结构、地震火山预警、地磁导航等应用领域有重要意义。简要介绍了部分近年来国际高精度地壳磁场模型,通过分析发现NGDC-720模型较以往低阶模型精度有明显改善,并据此模型绘制了东海以及毗邻海域三分量磁异常分布,发现该模型能与地质结构相吻合,能给相关应用领域提供更多的信息和保障。
In allusion to lithospheric magnetic field,a high-resolution geomagnetic model always exhaustively reflects the distribution of the geomagnetic field at geoid altitude,and it has a high resolution.This field is essential to resource exploration,geological structure,early-warning of earthquake and volcano,geomagnetic navigation.In this paper,some high-resolution geomagnetic models are briefly introduced.The NGDC-720 model is analyzed and compared with the low-order ones.The result shows that the NGDC-720 model has a higher precision.The author draws the three-weight anomaly maps in east-sea of China and adjacent areas with the above data.The results from the maps have more common with geological structure.Consequently,the more guarantee and communication are provided in correlative application scopes.
In allusion to lithospheric magnetic field,a high-resolution geomagnetic model always exhaustively reflects the distribution of the geomagnetic field at geoid altitude,and it has a high resolution.This field is essential to resource exploration,geological structure,early-warning of earthquake and volcano,geomagnetic navigation.In this paper,some high-resolution geomagnetic models are briefly introduced.The NGDC-720 model is analyzed and compared with the low-order ones.The result shows that the NGDC-720 model has a higher precision.The author draws the three-weight anomaly maps in east-sea of China and adjacent areas with the above data.The results from the maps have more common with geological structure.Consequently,the more guarantee and communication are provided in correlative application scopes.
引文
[1]徐文耀,白春华,康国发.地球磁异常的全球模型[J].地球物理学进展,2008,23(3):641~651.
[2]M ioara M,Michael P.Observing,modeling,andinterpreting magnetic field of the solid Earth[J].revision3_manuscript.tex,2005.
[3]Nils Olsen,Terence J.Sabaka.On estimating high-degreecrustal field models using spherical harmonic transforms[J].Planetary Geodynamics,2007.
[4]王小多,程顺有,许小强.塔里木盆地高分辨率卫星磁异常特征[J].地球物理学进展,2008,23(1):25~30.
[5]Sabaka T J,Olsen N,Langel R A.A comprehensivemodel of the quit-time near Earth magnetic field:Phase3[J].Geophys.J.Int.,2002,151:32~68.
[6]Bakus G E.Poloidal and toroidal field in geomagneticfield modeling[J].Rev.Geophys.,1986,24:75~109.
[7]徐文耀.地磁场的三维巡测和综合建模[J].地球物理学进展,2007,22(4):1035~1039.
[8]Maus S,Rother M,Hemant K,et al.Earth’s lithosphericmagnetic field determined to spherical harmonic degree90from CHAMP satellite measurements[J].Geophys.J.Int.,2006,164:319~330.
[9]Maus S,Yin F,Rother M.Resolution of direction ofoceanic magnetic lineations by the sixth-generationlithospheric magnetic field model from CHAMP satellitemagnetic measurements[J].Geochemistry GeophysicsGeosystems,2008,9:Q07021,doi:10.1029/2008GC001949.
[10]王慧琳,陈超,张昌达.最新的岩石圈磁场模型及中国磁异常特征的几点认识[J].地学前缘,2008,15(3):64~71.
[11]NOAA/NGDC Satellite and information Service[EB/OL].http://www.ngdc.noaa.gov/geomag/geomagnetic field model at NGDC,2007.
[12]Fairhead M S,Hemant D,Ravat K,et al.A near-surfacegeomagnetic field model to spherical harmonic degree720[J].Eos Trans AGU,2006,87(52):Fall MeetSuppl,Abstract GP42A-02.
[2]M ioara M,Michael P.Observing,modeling,andinterpreting magnetic field of the solid Earth[J].revision3_manuscript.tex,2005.
[3]Nils Olsen,Terence J.Sabaka.On estimating high-degreecrustal field models using spherical harmonic transforms[J].Planetary Geodynamics,2007.
[4]王小多,程顺有,许小强.塔里木盆地高分辨率卫星磁异常特征[J].地球物理学进展,2008,23(1):25~30.
[5]Sabaka T J,Olsen N,Langel R A.A comprehensivemodel of the quit-time near Earth magnetic field:Phase3[J].Geophys.J.Int.,2002,151:32~68.
[6]Bakus G E.Poloidal and toroidal field in geomagneticfield modeling[J].Rev.Geophys.,1986,24:75~109.
[7]徐文耀.地磁场的三维巡测和综合建模[J].地球物理学进展,2007,22(4):1035~1039.
[8]Maus S,Rother M,Hemant K,et al.Earth’s lithosphericmagnetic field determined to spherical harmonic degree90from CHAMP satellite measurements[J].Geophys.J.Int.,2006,164:319~330.
[9]Maus S,Yin F,Rother M.Resolution of direction ofoceanic magnetic lineations by the sixth-generationlithospheric magnetic field model from CHAMP satellitemagnetic measurements[J].Geochemistry GeophysicsGeosystems,2008,9:Q07021,doi:10.1029/2008GC001949.
[10]王慧琳,陈超,张昌达.最新的岩石圈磁场模型及中国磁异常特征的几点认识[J].地学前缘,2008,15(3):64~71.
[11]NOAA/NGDC Satellite and information Service[EB/OL].http://www.ngdc.noaa.gov/geomag/geomagnetic field model at NGDC,2007.
[12]Fairhead M S,Hemant D,Ravat K,et al.A near-surfacegeomagnetic field model to spherical harmonic degree720[J].Eos Trans AGU,2006,87(52):Fall MeetSuppl,Abstract GP42A-02.
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