【摘要】 本文将球谐分析(SHA)和矩谐分析(RHA)依次用于空间范围逐步缩小的区域,得到了嵌套式磁场模型。这个模型可以清楚地反映出大小不同的各级地磁异常的三维结构,为研究地磁异常起源及有关的大地构造问题提供了较好的依据。本文建立的1970年代华北地区地磁场的三级嵌套模型由全球SHA模型、中国RHA模型和华北RHA模型三级组成。该模型指出,华北中部由南向北有一个由北北东逐渐转向北东东方向的Z分量正异常带,这可能与华北的地质构造有关。更多还原

【Abstract】 A nested model of the geomagnetic field has been obtained for North China by employing SHA (Spherical Harmonic Analysis) and RHA (Rectangular Harmonic Analysis) to succesive decreasing areas. This model illustrates the three-dimensional structures of magnetic anomalies with different scales. It consists of three parts: SHA model for the whole globe, RHA model for China, and RHA model for North China. The resulting model for North China, as depicted in Fig. 3 of this paper, reveals an interesting relationship between the positive anomaly of Z and tectonic behaviour in this region.更多还原