改进的阻尼法低纬度磁异常化极方法

An improved damping method for reduction to the pole of magnetic anomalies at low latitudes

中低纬度地区的磁异常资料进行化极处理能减少或消除斜磁化影响,对提高磁测资料的利用程度有重要意义.本文在总结分析原有的低纬度磁异常化极过程的基础上,改进了原有化极方法的滤波过程.改进后的阻尼化极方法,采用将振幅谱和相位谱分开进行滤波的过程,过程中只需要考虑对化极因子的振幅谱进行压制即可.通过公式分析表明该方法更加合理,减少了人为因素的影响;经单个模型和组合模型试验表明,此化极方法准确、稳定、可靠,可以有效地突出低纬度地区的异常体信息.

For magnetic data at low and middle latitudes, the reduction-to-the-pole technique can be used to eliminate or reduce the effect of inclined magnetization. In this paper, on the basis of summarizing and analyzing the existing reduction to the pole methods, an improved damping pole method is proposed, which is advanced in the filtering approach. In the filtering process, the improved damping pole method separates the filtering factor into amplitude spectrum and phase spectrum,and only the suppression of the amplitude spectrum needs be taken into consideration. Furthermore, the formula analysis and the theoretical model analysis both give the satisfactory results, the former proves that the method is more reasonable, less affected by the human factors, and the latter shows that this method can highlight the abnormal body information effectively.