利用水平梯度分析信号振幅的倾斜角度增强磁源边缘

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geophysical Prospecting Pub Date : 2024-07-22 DOI:10.1111/1365-2478.13573
Luan Thanh Pham, Richard S. Smith, Saulo P. Oliveira, Vinicius Theobaldo Jorge
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引用次数: 0

摘要

由于地磁场的非垂直方向和剩磁源磁化的方向,增强磁数据通常比较复杂。可以通过将数据还原到磁极(在数学上使地磁场垂直)来减少这种复杂性,但这种还原过程是有问题的。解析信号振幅可用于增强二维信号源的边缘,而无需还原到极点。然而,对于网格数据来说,解析信号振幅的形状与磁化方向关系不大。本研究提出了一种改进的技术,即垂直积分水平梯度的解析信号振幅的倾斜角。这个量也只是微弱地依赖于磁化方向,并且比其他方法更好地勾勒出边缘。它还隐含了磁场的二阶导数,我们使用合成数据证明,噪声不会像使用其他隐含二阶导数的边缘增强技术那样被放大。与其他边缘增强方法相比,巴西阿皮亚地层的数据集显示出良好的横向连续性,而且在我们的新方法生成的图像中,断层等细微特征更容易识别。为了减少噪声对该领域示例的影响,通常需要进行的领域向上延续是不必要的。
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Enhancing magnetic source edges using the tilt angle of the analytic-signal amplitudes of the horizontal gradient

Enhancing magnetic data is often complicated due to the non-vertical orientation of the geomagnetic field and the orientation of remanent source magnetization. The complication can be reduced by reducing the data to the pole (mathematically making the geomagnetic field vertical), but this reduction process is problematic. The analytic-signal amplitude can be used to enhance the edges of two-dimensional sources without a reduction to the pole. However, the shape of the analytic-signal amplitude is weakly dependent on the magnetization direction for grid data. This study presents an improved technique, namely the tilt angle of the analytic-signal amplitudes of the horizontal gradient of the vertical integral. This quantity is also only weakly dependent on the magnetization direction and outlines the edges as well or somewhat better than other methods. It also implicitly involves second derivatives of the magnetic field, and we use synthetic data to demonstrate that noise is not amplified as much as it is when using other edge enhancement techniques that implicitly use second derivatives. A dataset of the Apiaí Terrane, Brazil, shows good lateral continuity of features compared with other edge-enhancement methods, and subtle features like faults are easier to identify in the images generated by our new method. Upward continuation of the field, which is normally required, was not necessary to reduce the impact of noise on this field example.

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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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