Enhancement of Potential Field Source Boundaries Using an Improved Logistic Filter

Pham, Luan Thanh; Vu, Tich Van; Thi, Sang Le; Trinh, Phuong Thi

doi:10.1007/s00024-020-02542-9

Cited by 85 publications

(46 citation statements)

References 26 publications

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“…Thông thường, các phương pháp xác định biên được chia thành hai nhóm chính, gồm: nhóm phương pháp dựa trên biên độ đạo hàm và nhóm phương pháp dựa trên pha. Evjen (1936), Cordell và Grauch (1985), Roest và nnk (1992), Hsu và nnk (1996) [3,[16][17][18][19][20][21][22][23][24][25][26][27][28]. Ưu điểm của các phương pháp này là không yêu cầu biết trước các thông tin về nguồn gây dị thường.…”

Section: Mở đầUunclassified

Estimating Effectiveness of Some Methods for Detecting Edge of Potential Field Sources

Luan¹,

Sang²,

Minh³

et al. 2020

NST

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This paper presents a comparative study of effectiveness of edge detection methods such as total horizontal gradient, analytic signal amplitude, tilt angle, gradient amplitude of tilt angle, theta map, horizontal tilt angle, tilt angle of total horizontal gradient, tilt angle of analytic signal, improved theta map, and total horizontal gradient of improved tilt angle. The effectiveness of each method was estimated on synthetic magnetic data and synthetic gravity anomaly data with and without noise. The obtained results show that the tilt angle of gradient amplitude can detect all the edges more clearly and precisely. The applicability of each method is demonstrated on the aeromagnetic anomaly data from the Zhurihe region of Northeast China, and Bouguer gravity anomaly data from a region of North Vietnam. The results computed by the tilt angle of horizontal gradient were also in accord with the geologic structures of the areas.

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Section: Mở đầUunclassified

Estimating Effectiveness of Some Methods for Detecting Edge of Potential Field Sources

Luan¹,

Sang²,

Minh³

et al. 2020

NST

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“…These points are structured into a series of linear fragments known as edges. Several techniques have been developed to enhance the delineation of edges of source bodies using gravity and magnetic data [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Implementing Digital Edge Enhancers on Improved High-Resolution Aeromagnetic Signals for Structural-Depth Analysis around the Middle Benue Trough, Nigeria

2021

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Digital edge detector operations using magnetic derivatives in conjunction with spectra depth analysis were performed on high-resolution aeromagnetic signals to enhance the delineation and interpretation of depth, structural, and intrasedimentary features within the Middle Benue Trough (MBT) of North Central Nigeria, which could serve as a guide for mineral exploration. The derivatives revealed high-amplitude and short-wavelength anomalies over areas underlain by crystalline basement complexes, major volcanic zones, and aggregates of intrasedimentary volcanic and plutonic rocks. Geologic lineaments trending predominantly NE–SW and NW–SE, as well as minor trends of E–W and N–S, suggest that the area has undergone differential stress regimes across geologic time. The spectral depth analysis indicates a two-source depth model. The deep depth ranges from 1.9 to 6.1 km with an average of 3.9 km, whereas the shallow depth ranges between 0.3 and 1.9 km with an average of 0.8 km and is found to emanate from magnetic signals of post-Cretaceous near-surface igneous intrusions as well as other magnetized bodies embedded within the sediments. The spatial distribution of various hydrothermal minerals such as lead–zinc–barite deposits, as well as salt mineralization, is associated with the widespread Tertiary–recent magmatism and governed by pre-existing tectonic structures in the region.

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“…Some authors have developed the different techniques based on the amplitudes of the gradients of the field to detect the edges related to a known gravity anomaly [46][47][48][49]. Several other authors have introduced the techniques based on the ratios of gradients of the gravity data to extract the edges of the sources [50][51][52][53][54][55][56][57]. One of the most important advantages of these techniques is that they do not need an assumption about the nature and type of the causative bodies [22].…”

Section: Introductionmentioning

confidence: 99%

The utility of the enhancement techniques for mapping subsurface structures from gravity data

Pham¹,

Xuan²,

Eldosouky³

et al. 2021

Frontiers in Scientific Research and Technology

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An important feature in the interpretation of gravity data is the determination of the edges of the density structures. There are several different enhancement techniques used to achieve the edge locations. In this study, we aim to estimate the effectiveness of some edge enhancement techniques such as the total horizontal gradient, analytic signal, theta map, and logistic function of the total horizontal gradient in terms of their accuracy on detection of subsurface structures from gravity data. These methods were tested on synthetic gravity data with and without noise. Findings show that the logistic function of the total horizontal gradient performs better than other methods under almost all cases. Additionally, the methods are also applied to real gravity data from the Phu Khanh basin as a practical example. The results determined by the LTHG technique reveals the presence of many structures with E-W, NE-SW, NNW-SSE, ENE-WSW, and NNE-SSW trends in the basin.

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Enhancement of Potential Field Source Boundaries Using an Improved Logistic Filter

Cited by 85 publications

References 26 publications

Estimating Effectiveness of Some Methods for Detecting Edge of Potential Field Sources

Estimating Effectiveness of Some Methods for Detecting Edge of Potential Field Sources

Implementing Digital Edge Enhancers on Improved High-Resolution Aeromagnetic Signals for Structural-Depth Analysis around the Middle Benue Trough, Nigeria

The utility of the enhancement techniques for mapping subsurface structures from gravity data

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