Using the analytic signal amplitude to determine the location and depth of thin dikes from magnetic data
Using the analytic signal amplitude to determine the location and depth of thin dikes from magnetic data
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DOI：
10.1190/geo2014-0061.1
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发表时间：
2015
期刊：
影响因子：
3.3
通讯作者：
G. Cooper
中科院分区：
文献类型：
--
作者：
G. Cooper
介绍了一种确定薄堤坝位置和深度的半自动方法。利用薄岩墙磁异常0阶和1阶解析信号幅度之比，确定距岩墙的距离r。r的局部最小值给出了堤坝的深度，这些最小值的位置给出了堤坝的水平位置。因为在该方法中，我们只使用磁场及其一阶导数，所以它对噪声的敏感性低于基于高阶导数的方法。一旦岩脉的位置已经确定，那么它的倾角和磁化率-厚度积可以从分析信号幅度计算，假设磁化矢量是已知的。
ABSTRACTA semiautomatic method to determine the location and depth of thin dykes is introduced. The ratio of analytic signal amplitudes of orders 0 and 1 of the magnetic anomaly from a thin dike was used to give the distance r to the dike. Local minima of r gave the depth to the dike, and the position of these minima gave its horizontal location. Because in the method we used just the magnetic field and its first-order derivatives, it was less sensitive to noise than were higher order derivative-based methods. Once the position of the dike has been determined, then its dip and susceptibility-thickness product can be calculated from the analytic signal amplitude, providing that the magnetization vector is known.