%0 Journal Article
%T 重磁数据稳定向下延拓的水平导数迭代法<br>Horizontal Derivative Iteration Method for Downward Continuation of Gravity and Magnetic Data
%A 马国庆
%A 明彦伯
%A 贺杨
%A 王丽华
%A 李丽丽&lt
%A br&gt
%A Ma Guoqing
%A Ming Yanbo
%A He Yang
%A Wang Lihua
%A Li Lili
%J 地球科学(中国地质大学学报)
%D 2016
%R 10.3799/dqkx.2016.101
%X 向下延拓是重磁数据处理的常用手段，能有效地区分叠加异常、增强浅部异常，但现有向下延拓算法的计算大多是不稳定的，且易受噪声的干扰，往往造成异常形态的畸变.提出一种基于水平导数和向上延拓联合迭代的向下延拓算法，由于向上延拓和水平导数的计算是稳定的，因此该向下延拓方法可有效地增强结果的准确性和稳定性.理论模型试验表明该方法的向下延拓结果比Fourier变换计算结果更加稳定、准确，且受噪音干扰小.将该方法应用于实际数据的处理，结果显示该方法能稳定和准确地完成异常的向下延拓任务，且有效地增强了浅部局部异常.<br>Downward continuation is an effective tool in the processing of potential field data, which can identify overlap anomalies and enhance weak anomalies effectively. But the existing computation methods of downward continuation easily distort the true feature of potential field data since they are unstable and sensitive to noise. In this paper, we present an iteration method based on horizontal derivative, and we prove that downward continuation can be computed by the combination of upward continuation and horizontal derivative, and the computation of upward continuation and horizontal derivative is stable, which confirms stability and reliability of the method. The proposed method has been tested on synthetic potential field data, and it is found that the output results are more stable and accurate than those computed by the Fourier transform, and more insensitive to noise. Its application to real potential field data shows the same results and it really enhances the local anomalies
%K 重磁
%K 水平导数
%K 向下延拓
%K 迭代
%K 地球物理&lt
%K br&gt
%K gravity and magnetic
%K horizontal derivative
%K downward continuation
%K iteration
%K geophysics.
%U http://www.earth-science.net/WebPage/Article.aspx?id=3332