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上期介绍了重磁异常的解析延拓方法,这里谈谈磁异常转换的另一种方法——化向地磁极。一、为什么要“化向地磁极”大家知道,地磁场在地表是按一定规律分布的。如图所示,在赤道附近(A、B处),地磁倾角I=0°,地磁场强度T指向水平方向,因而磁体受到地磁场“水平磁化”;在地理南、北极附近(H、G处),I=90°,T指向铅直(向上或向下)方向,因而磁体受到“垂直磁化”;而在赤道和两极间的广大地区(如C、D、E、F等处),Ⅰ<90°T指向倾斜方向,磁体则受到“倾斜磁化”。我国领土大约在北纬20°—60°之间,符合倾斜磁化的条件。
In the last issue, we introduced the method of analyzing the extension of gravity and magnetic anomalies. Here we talk about another method of magnetic anomaly conversion - to the geomagnetic pole. First, why should “change to the magnetic pole” We all know that the geomagnetic field is distributed according to a certain law on the surface. As shown in the figure, the magnetosphere is “horizontally magnetized” by the geomagnetic field in the vicinity of the equator (A and B) where geomagnetic inclination I = 0 ° and the geomagnetic intensity T points in the horizontal direction; I = 90 °, T points vertically (upwards or downwards) so that the magnet is “vertically magnetized”; and in a wide area (eg C, D, E, F etc.) between the equator and the poles, Ⅰ <90 ° T points in the direction of tilt, the magnet is subjected to “tilt magnetization.” Our territory is about 20 ° -60 ° north latitude, in line with the conditions of oblique magnetization.