基于MMTs的吉林省矿区磁异常线性特征分析

Analysis of Linear Characteristics of Magnetic Anomalies in Jilin Mining Area Based on MMTs

本文使用级磁变换(magnitude magnetic transforms,MMTs)对吉林省某矿区的磁异常进行了处理.MMTs包括总量异常(total magnitude anomaly,TMA)、TMA梯度的模、TMA Laplacian结果、TMA和TMALaplacian结果的乘积的平方根、TMA平方的Laplacian结果再开方取二分之一.MMTs得到的异常更接近此次研究矿区磁异常源的真实位置,实际解释更加容易.和传统的磁异常化极(reduction to the pole,RTP),磁源重力异常(pseudo-gravityanomaly)、解析延拓(analytical continuation)相比,MMTs只需要计算一阶水平导数,在低磁纬度地区的稳定性更强,并且不受地磁场矢量方向的影响.

In this paper,the magnitude magnetic transforms(MMTs)are used to deal with the magnetic anomalies in a mining area of Jilin Province.MMTs include total magnitude anomaly(TMA),the modulus of TMA gradient,the square root of the product of TMA and TMA Laplacian,and the Laplacian result of TMA square.The anomaly obtained by MMTs is closer to the real location of the magnetic anomaly source in this study,and the actual interpretation is easier.Compared with the traditional reduction to the pole(RTP),pseudo-gravity anomaly and analytical continuation,MMTs only need to calculate the first-order horizontal derivative,which is more stable in low magnetic latitudes and is not affected by the direction of geomagnetic field vector.