Advantages of using the vertical gradient of gravity for 3-D interpretation

Marson, I.; Klingelé, E.

doi:10.1190/1.1443374

Cited by 141 publications

(72 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[18], [17] have shown that for the low index structural of from 0 to 1, there are the best estimates of depths and bundled solutions. Moreover, [23] noted that the appropriate choice of the window size depends on the wave length of the anomaly examined and the size of grid. Therefore, in this study the following parameters have permit reflect the morphological status of the study area:…”

Section: Depths From Euler Deconvolutionmentioning

confidence: 99%

Evidence by Multi-Scale Analysis of Lineaments Derived from Gravity Anomalies in the Batouri Area (Eastern-Cameroon)

2016

IJSR

View full text Add to dashboard Cite

Section: Depths From Euler Deconvolutionmentioning

confidence: 99%

Evidence by Multi-Scale Analysis of Lineaments Derived from Gravity Anomalies in the Batouri Area (Eastern-Cameroon)

2016

IJSR

View full text Add to dashboard Cite

“…To reduce the effect of delocalization of the maxima, we made use of the vertical gradient maps which are quite able to minimize the effect of the interference of the gravity signatures of the sources [6,20,21].…”

Section: Methodsmentioning

confidence: 99%

Geophysical Signature Location in the South-West of Chad: Structural Implications

Benoit¹,

Nouayou²,

Victor³

et al. 2017

J Geol Geophys

View full text Add to dashboard Cite

IntroductionChad corresponds to the mobile zone formed during the PanAfrican orogenesis that occurred at Proterozoic between 830 and 665Ma [1]. This mobile zone is bounded to the south by the Congo Craton, to the West by the West African Craton and to the NorthEast by the metacraton of the Sahara. It appears that the whole of the Precambrian formations were marked by a strong imprint during the Pan-African events.These Precambrian formations identified in Chad are distributed between the Tibesti massifs in the north, Ouaddaï in the east, Yadé (Mbaibokoum) in the south and the Mayo-kebbi in the South-west. They cover 15 to 20% of the surface of the national territory [2].The secondary formations appear in the Erdis basin (Cretaceous Nubian sandstone) and the Mayo-Kebbi (Lower Cretaceous and Middle Cretaceous) basin. They also constitute the filling of several pits in Southern Chad (Lake Chad, Bousso, Doba, Salamat). They are sandstones of the intercalary continental and those of the Cretaceous with lagoon and marine features. The Pala-Lame basin located in Mayo-Kebbi, in the Southwest of Chad near the border with Cameroon, is part of the Yadé massif, a large outcrop of the Precambrian basement which extends to Cameroon, the Republic of Central Africa, Congo and Gabon, and includes the Congo Craton [3].The region consists essentially of a large granite batholith (MayoKebbi batholith), containing septa of metamorphites and two strips of volcano-sedimentary metamorphic epikeal formations similar to the greenstone belts [3,4]. The whole is intersected by a series of intrusive and vein rocks, ranging from alkaline granite to ultrabasic rocks.Although the results of the various works cited above provided useful information over the study area, none of them proposed the cartography of the lineaments therein in a precise way. The latter is the objective of the present study. The Bouguer anomaly map of the study area has strong contrasts (gradients) that indicate discontinuities such as faults and flexures. In order to study these discontinuities, we conducted an analysis based on the horizontal gradient of the vertical derivative coupled with upward continuation and Euler's deconvolution. These approaches that have been successfully used in AbstractA Study is conducted in South-West of Chad with the goal of underlining the different lineaments of the region, which are entirely or partially hidden by the sedimentary cover. Different gravity data processing techniques including horizontal gradient of vertical derivative coupled with upward continuation and Euler's de-convolution are used. These methods revealed a number of lineaments describing gravity density discontinuities whose directions are N-S, NE-SW, ENE-WSW, and WNW-ESE at NNW-SSE. However, the predominant direction for major lineaments is WNW-ESE. The major lineaments associated to the faults are: F1, F2, F3, F6, F7, F8, F9, F10, F14, F21, F22, F23, F24 and F28. Euler's solutions indicate depths up to 9.2 km for the anomaly sources. Such lineaments are very usefu...

show abstract

“…The next stage was devoted to comparing an observed field to analytic models-first, by means of charts (e.g., Chastenet de Gery and Naudy, 1957), and later by a variety of different techniques that use synthetic model fitting, such as Werner deconvolution (e.g., Werner, 1953;Hartman et al, 1971), Euler deconvolution (e.g., Thompson, 1982;Reid et al, 1990), and analytic signal (e.g., Nabighian, 1972;Roest et al, 1992). Extensive applications and improvements of these methods have been published, such as the use of vertical gradients (e.g., Marson and Klingele, 1993;Debeglia and Corpel, 1997) and considering the effect of noise in data (Keating, 1998). These techniques have almost always been used assuming a chosen geometry of the source.…”

Section: Introductionmentioning

confidence: 99%

Characterization of geological boundaries using 1‐D wavelet transform on gravity data: Theory and application to the Himalayas

et al. 2001

View full text Add to dashboard Cite

We investigate the use of the continuous wavelet transform for gravity inversion. The wavelet transform operator has recently been introduced in the domain of potential fields both as a filtering and a source-analysis tool. Here we develop an inverse scheme in the wavelet domain, designed to recover the geometric characteristics of density heterogeneities described by simple-shaped sources. The 1-D analyzing wavelet we use associates the upward continuation operator and linear combinations of derivatives of any order. In the gravity case, we first demonstrate how to localize causative sources using simple geometric constructions. Both the upper part of the source and the whole source can be studied when considering low or high altitudes, respectively. The homogeneity degree of the source is deduced without prior information and allows us to infer its shape. Introducing complex wavelets, we derive analytically the scaling behavior of the wavelet coefficients for the dyke and the step sources. The modulus term is used in an inversion procedure to recover the thickness of the source. The phase term provides its dip. This analysis is performed on gravity data we measured along a profile across the Himalayas in Nepal. Good agreement of our results with well-documented thrusting structures demonstrates the applicability of the method to real data. Also, deeper, less constrained structures are characterized.

show abstract

Advantages of using the vertical gradient of gravity for 3-D interpretation

Cited by 141 publications

References 8 publications

Evidence by Multi-Scale Analysis of Lineaments Derived from Gravity Anomalies in the Batouri Area (Eastern-Cameroon)

Evidence by Multi-Scale Analysis of Lineaments Derived from Gravity Anomalies in the Batouri Area (Eastern-Cameroon)

Geophysical Signature Location in the South-West of Chad: Structural Implications

Characterization of geological boundaries using 1‐D wavelet transform on gravity data: Theory and application to the Himalayas

Contact Info

Product

Resources

About