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近年来,通过地磁场研究地壳深部问题愈来愈为人们所重视。本文通过研究大地磁异常来推断和分析东北地区深部构造和地壳结构。 一、地磁场的泰勒多项式模式和大地磁异常 地球磁场是由内源场和外源场两部分组成的。内源场是地球本身产生的磁场,约占地球磁场的99.5％,这就是通常说的基本磁场。大地地磁测量数据经过通化(对观测资料进行变(化磁场和长期变化校正)以后即可获得同一年代的基本磁场。基本磁场是由正常磁场和异常磁场组成的。正常场是地核场,是由地核内部原因产生的中心偶极
In recent years, it has been paid more and more attention to study the deep crustal issue through the geomagnetic field. In this paper, the geomagnetic anomaly to infer and analyze the deep structure and crustal structure in Northeast China. First, the Taylor field geomagnetic field polynomial model and the Earth’s magnetic anomaly is the magnetic field from the endogenous and exogenous fields of two parts. The endogenous field is the Earth’s own magnetic field, accounting for about 99.5% of the Earth’s magnetic field, which is the so-called basic magnetic field. The geomagnetic data of the earth can be obtained through the generalization of the normalized magnetic field (the change of the magnetic field and the long-term change of the observed data). The basic magnetic field is composed of the normal magnetic field and the abnormal magnetic field. Center dipole due to internal causes of the earth’s core