Edge interpretation of potential field data with the normalized enhanced analytic signal

Yao, Yongming; Huang, Danian; Yu, Xianli; Chai, Bosen

doi:10.1007/s40328-015-0120-x

Cited by 20 publications

(4 citation statements)

References 21 publications

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“…Tilt angle filter is used for detecting the boundaries of the anomalous body in the present work. The method is introduced long time ago and have been applied and modified by several researchers ( [21][22][23][24][25][26][27][28][29]). The method is sometimes names tilt derivative because the filter itself if the ratio between the first vertical derivative and the horizontal gradient of the potential field.…”

Section: Gravity and Magneticmentioning

confidence: 99%

Shallow subsurface modelling of Sungkai using ERT and potential fields methods

Khalil,

Younis,

Mohd Nordin

et al. 2024

Advances in Basic and Applied Sciences

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Development of hot spring sites in Malaysia has been targeted by authorities to enhance its touristic and recreational assets. Previous experiences showed that some hot springs were damaged, and the flow of water had stopped, or the water temperature had decreased. To solve this problem, the knowledge of the subsurface structural model may be needed. The modelling should be carried out using non-invasive methods according to the present land-use conditions. Hence, the geophysical methods are adopted as they have two advantages; first, they are non-invasive; second, they are cost effective. The present work was conducted to aide in both modelling the subsurface structures and guiding the development plans of the recreation complex. Besides, the study focusses on the shallow part of the geothermal system that pave the way for more deeper study to weigh the potential of establishing a geothermal power plant near the site. Geophysical methods used in this study are the 2D ERT and potential fields (magnetic and gravity). Pseudo 3-D ERT block was created from the 2-D profiles to compare with the of the potential fields. The final model of the area deduced that the area is affected by a shear zone. The present-day hot spring is located near the boundary of the shear zones. The model also shows that there are several sites in the complex with stable subsurface that can be used for development without affecting the hot spring system.

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Section: Gravity and Magneticmentioning

confidence: 99%

Shallow subsurface modelling of Sungkai using ERT and potential fields methods

Khalil,

Younis,

Mohd Nordin

et al. 2024

Advances in Basic and Applied Sciences

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“…Florio et al (2006) showed that the vertical derivative of the analytic signal amplitude calculated from the frequency domain technique can be used to estimate the source depth, but it is not effective in detecting the structural index. Ferreira et al (2013), Yao et al (2015), Pham et al (2019a) estimated horizontal boundaries by using the vertical derivative of the horizontal gradient amplitude calculated from the frequency domain technique. Cooper (2014b), Pham et al (2019b) used a direct expression for computing the vertical derivative of the analytic signal amplitude.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different approaches of computing the tilt angle of the total horizontal gradient and tilt angle of the analytic signal amplitude for detecting source edges

Pham¹,

Öksüm²,

Duc³

et al. 2020

Bulletin of the Mineral Research and Exploration

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This paper compares effectiveness of the different approaches of computing the tilt angle of the horizontal gradient amplitude and tilt angle of the analytic signal amplitude such as use of direct expression and frequency domain technique (also called k -function) in terms of their accuracy on the detection of the edges of magnetic and gravity sources. These approaches were performed on both synthetic magnetic and gravity data where the frequency domain technique shows improvements in delineation of the actual edges of the sources compared to the direct expression. Additionally, real magnetic data from Zhurihe (Northeast China), and real gravity data from Tuan Giao (Northwest Vietnam) was considered and the obtained results from applying the different approaches were compared with known geological structures. The results show that the boundaries detected from the use of the frequency domain technique are in accord with the known geological structures.

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“…Ma et al (2014) used the tilt angle of the ratio between the first order horizontal gradient and the second order horizontal gradient. Yao et al (2015) used the normalized enhanced analytic signal; Chen et al (2017) used modified theta map filters. Nasuti and Nasuti (2018) proposed using a modified tilt angle that based on the vertical derivative of the analytical signal amplitude in different.…”

Section: Introductionmentioning

confidence: 99%

LAS: A combination of the analytic signal amplitude and the generalised logistic function as a novel edge enhancement of magnetic data

Pham

Öksüm

Duc

et al. 2019

Contributions to Geophysics and Geodesy

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In the evaluation of magnetic field data, edge enhancement and detection techniques are important treatments for the interpretation of geological structures. In general geological sense, contiguity of deep and shallow magnetic sources leads to weak and intense anomalies that complicates the interpretation to disclose adjacent anomalous sources. Many of the existing filters for edge detection in magnetics mostly have the disadvantage that they require a reduction to pole transformation as the pre-process of the data or they cannot balance weak and intense anomalies and therefore fail in detecting edges of deep and shallow sources simultaneously. This study presents an improved edge detection filter LAS (logistic function of the analytical signal), based on the generalised logistic function configured by the ratio of derivatives of the analytical signal. This novel approach has the capability of reducing the dependence on the direction of the magnetization and also balancing anomalies of sources at different levels of depth. The feasibility of the method is examined on both theoretical and real data cases comparatively with some other methods that utilize the analytical signal in their basis. In comparison, the results demonstrate that the LAS method provides more accurate estimation of edge localization.

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Edge interpretation of potential field data with the normalized enhanced analytic signal

Cited by 20 publications

References 21 publications

Shallow subsurface modelling of Sungkai using ERT and potential fields methods

Shallow subsurface modelling of Sungkai using ERT and potential fields methods

Comparison of different approaches of computing the tilt angle of the total horizontal gradient and tilt angle of the analytic signal amplitude for detecting source edges

LAS: A combination of the analytic signal amplitude and the generalised logistic function as a novel edge enhancement of magnetic data

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