摘要
本文根据中国及其邻近地区的地磁三分量绝对测量资料,利用球冠谐和分析方法,计算出中国地区地磁剩余场的冠谐模型,地磁剩余场△X,△Y,△Z的模型均方根偏差分别为106.9,89.7,137.6 nT.提出由地磁场的国际参考地磁场和地磁剩余场的冠谐模型组成的联合模型作为中国参考地磁场的模型,它能较好地表示中国地磁场的分布.以地磁场的联合模型为正常背景场,计算出三分量磁异常的冠谐模型,并分析了磁异常的基本特征,它将为深入研究中国岩石层结构提供新证据.
Based on three-component absolute observed data over China and its adjacent areas, using spherical cap harmonic analysis method, a spherical cap harmonic model describing the regional residual magnetic field in China has been derived. The pole of the cap was at 35°N, 105°E, its half-angle was 35°and maximum index of 12 was used. The standard errors of estimate for ΔX, ΔY and ΔZ were 106.9, 89.7 and 137.6nT respectively. The model of Chinese geomagnetic reference field, called combined model, consists of spherical harmonic model of the geomagnetic field and spherical cap harmonic model of the regional residual magnetic field, it is very good to express the distribution of the geomagnetic field in China. From the combined model of Chinese geomagnetic reference field, a spherical cap harmonic model of magnetic anomaly (Δ6Xa, ΔYa and ΔZa) was calculated. The basic characteristics of magnetic anomaly were analysed, it can provide fresh evidence for deeply studying the lithospheric structure.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第6期753-764,共12页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
球冠谐和分析
地磁场
磁异常
Spherical cap harmonic analysis, Chinese geomagnetic reference field, Magnetic anomaly, Lithospheric structure.
