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利用墙状岩体模型可以简便地分析磁异常。在这种模型中,场源埋深约为1.25S,这里的S是在最陡侧面测量的S-S长度。墙状岩体的倾角可以用θ来计算,θ为复合磁角,可以用异常的最大幅值和最小幅值的比值求出。在存在剩磁的情况下,只有在总磁化强度的方向已知或假定了的时候,墙状岩体的倾角δ才能从θ中求出,如果倾角已知,磁化方向可以求出。按照关系式κ=0.3A/T,可以用异常的总幅值A和感应磁埸强度T来计算埸源的最小磁化率衬度值k。用这种方法已经解释了许多航磁异常。本文列举了几个磁异常以说明这种方法的适用性。
Magnetic anomaly can be easily analyzed by using wall rock mass model. In this model, the field source depth is about 1.25 S, where S is the S-S length measured on the steepest side. The inclination of the wall rock mass can be calculated by θ, and θ is the composite magnetic angle, which can be calculated from the ratio of the maximum and minimum amplitude of the anomaly. In the presence of remanence, the inclination δ of the wall rock mass can be determined from θ only if the direction of total magnetization is known or assumed, and the magnetization direction can be determined from the angle of inclination. According to the relational expression κ = 0.3A / T, the minimum magnetic susceptibility contrast k of the source can be calculated from the total amplitude A of the anomaly and the magnetic susceptibility T. Many aeromagnetic anomalies have been explained in this way. This article lists several magnetic anomalies to illustrate the applicability of this approach.