Spectral Analysis of Gravity and Magnetic Anomalies Due to Two‐dimensional Structures

Bhattacharyya, B. K.; Leu, L. K.

doi:10.1190/1.1440593

Cited by 152 publications

(69 citation statements)

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“…This approach is known as the centroid depth method (Bansal et al, 2011). Bhattacharyya and Leu (1975) derived the equations for calculating the centroid and top depths for 2D structures with arbitrary polygon cross-sections, and Okubo et al (1985) suggested that the same equations are applicable to any 3D shaped bodies. The DBMS can be calculated as follows.…”

Section: Centroid Depth Methods For Calculating Dbms 221 Random Magmentioning

confidence: 99%

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Abraham¹,

Obande²,

Chukwu³

et al. 2015

Turkish J Earth Sci

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The Wikki Warm Spring (WWS) is located on the Kerri-Kerri formation of tertiary age. This forms part of the Benue Basin, which links up with the Chad Basin in the north and extends southwest to the Anambra Basin in Nigeria. The stratigraphy of the WWS region consists of alluvium, the Kerri-Kerri formation, the Gombe formation, the Pindiga formation, the Yolde formation, the Bima formation, and basement rocks as the oldest. We estimate the depth to the bottom of magnetic sources (DBMS) in the WWS region using the fractal sources distribution approach on aeromagnetic data to identify the geothermal system of the WWS region. The adopted computational method is based on statistical methods of depth determination from the radial power spectrum assuming a fractal distribution of magnetic sources. The average estimated DBMS at the WWS source location is 10.72 ± 0.54 km. The obtained results imply an average thermal gradient of 54.11 °C km -1 and heat flow value of 135.28 mW/m 2 . Generally, shallow DBMS values are obtained in the northeastern region of the WWS area and these increase towards the southwestern region when regional variation patterns of estimated depths are considered. The generally shallow DBMS obtained in the study area is attributed to magmatic intrusion or diapirism in the subsurface and emphasizes the effects of large-scale tectonic events, particularly the basin-initiating event, as major influences on the thermal history. Results will contribute to decisions on where to drill boreholes for further geothermal energy exploration in the region.

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Section: Centroid Depth Methods For Calculating Dbms 221 Random Magmentioning

confidence: 99%

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Abraham¹,

Obande²,

Chukwu³

et al. 2015

Turkish J Earth Sci

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“…It has been used extensively by many authors, namely [14] [15] [16]. The finite discrete Fourier transform is given by the equation:…”

Section: Spectral Analysismentioning

confidence: 99%

Determination of Structural and Geometrical Parameters of the Kribi-Campo Sedimentary Sub-Basin Using Gravity Data

Malquaire¹,

Clotilde²,

Nfor³

et al. 2017

IJG

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In order to produce a more detailed structural and geometrical information, and determine sediments thickness along the Kribi-Campo sub-basin, statistical spectral analysis and horizontal gradient analysis of residual anomalies coupled with the Euler deconvolution approach were applied on the gravity data in the area. The results obtained from the 2D spectral analysis on anomaly grids gave a depth to the basement rocks of the basin from 0.60 km to 3.93 km. This represents the thickness of the sedimentary formations overlying the basement. The interpretation of the spectral analysis results indicated that the potential hydrocarbon field areas are situated between Kribi and Lolabe and at Campo given that those areas have the highest sedimentary thicknesses values. From the analysis of the horizontal gradient, deep faults mainly striking SW-NE have been traced and a structural map of the area has been produced. By applying the Euler deconvolution method to the gravity data, information about the depth and trend of the main subsurface structures have been obtained.

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“…For this purpose, we used the spectral analysis technique first implemented by Spector & Grant (1970) and widely used thereafter (e.g. Bhattacharyya & Leu 1975;Studinger et al 1997;Ates & Kearey 2000;Gómez-Ortiz et al 2011). In this technique, the power spectrum of the gravity data is usually plotted against the angular frequency and the major density variation zones are interpreted from the slopes of the linear segments.…”

Section: Power Spectrum Analysis Of the Gravity Datamentioning

confidence: 99%

Use of a high-precision gravity survey to understand the formation of oceanic crust and the role of melt at the southern Red Sea rift in Afar, Ethiopia

Lewi

Keir

Birhanu

et al. 2015

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Abstract:The Red Sea arm of the triple junction in northeastern Ethiopia provides an opportunity to investigate rift-forming processes at divergent boundaries. In an attempt to study the subsurface, especially the distribution and role of melt in the rifting process, we carried out a high-precision gravity survey with a mean-square error of 0.011 mgal, assisted by differential global positioning system measurements. The profile is 162 km long and strikes ENE-WSW across the southern part of the Red Sea rift at a latitude of approximately 11.758 N. Modelling of the Bouguer anomaly, constrained by a priori information, showed detailed in-rift variations in the crustal structure and the distribution of melt beneath the rift axis. Our interpretation suggested that the process of continental break-up is governed by crustal stretching and rifting accompanied by the emplacement of melt into the lower crust above a lower density upper mantle. In addition, we interpreted the thickness of the crust beneath this part of the rift axis to be 25 km. The subsurface distribution of density beneath the profile shows that the south-central part of the Red Sea rift has modified thinned crust, intruded by high-density material, which resembles the crust formed during seafloor spreading.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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Spectral Analysis of Gravity and Magnetic Anomalies Due to Two‐dimensional Structures

Cited by 152 publications

References 0 publications

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach

Determination of Structural and Geometrical Parameters of the Kribi-Campo Sedimentary Sub-Basin Using Gravity Data

Use of a high-precision gravity survey to understand the formation of oceanic crust and the role of melt at the southern Red Sea rift in Afar, Ethiopia

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