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插值切割法通常被用于分离磁异常的区域场和局部场。本文进一步将插值切割法用于研究火成岩体的分布，因为大多数火成岩具有较强的磁性。其方法是：首先选取一较大的切割半径，对经过化权并消除干扰处理的实测磁异常进行分离，划分出由火成者引起的局部磁异常；然后用从小到大的一系列切割半径对局部磁异常进行抵值切割处理，得到相应的一系列异常幅值；当异常幅值出现稳定极值时，所对应的切割半径与该局部磁异常对应的火成岩体的中心埋深相当。这一规律是对球状火成岩体而言的。至于其它形状火成岩体，经过特殊处理，也能得到类似的结果。
Interpolation cuts are commonly used to separate regional and local fields of magnetic anomalies. In this paper, interpolation cutting method is further used to study the distribution of igneous rocks, because most igneous rocks have strong magnetism. The method is as follows: Firstly, a large cutting radius is selected to separate the measured magnetic anomalies that have undergone the right-weighting and interference elimination, and the local magnetic anomalies caused by the fire are divided; and then a series of cutting radii A series of anomalous amplitudes are obtained by cutting the local magnetic anomaly. Correspondingly, the cutting radius corresponds to the central depth of the igneous rock corresponding to the local magnetic anomaly when the anomalous amplitude appears stable extreme value. This rule is for spherical igneous rocks. Other forms of igneous rocks, after special treatment, also get similar results.