Gravity inversion of basement relief constrained by the knowledge of depth at isolated points

Leao, Jorge W. D.; Menezes, Paulo T. L.; Beltrão, Jacira Felipe; Silva, João B.

doi:10.1190/1.1887566

Cited by 5 publications

(8 citation statements)

References 7 publications

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“…Figure 15 shows the regional Bouguer anomaly map of the Recôncavo Basin, presented by Leão et al (1996). The original survey configuration data have been not available.…”

Section: Application Of the Proposed Methods To Recôncavo Basinmentioning

confidence: 99%

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Estimating free parameters in 2D inversion: example of gravity inversion in a rifted basement

Silva

Santos

Monteiro

2019

Geophysical Prospecting

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A B S T R A C TWe advance a principle directed to assigning numerical values to free parameters usually present in inversion methods. It may be formulated as: 'Optimum estimates of free parameters in an inversion procedure must lead, in tests using synthetic data, to solutions whose geometrical expression reflects the main qualitative or semiquantitative geological characteristic of the study area.' To this end, the interpreter should (i) specify a typical anomalous source geometry which incorporates the most relevant geological information for the study area, (ii) compute the corresponding gravity anomaly and (iii) invert the anomaly for the source geometry finding the numerical values of the free parameters that lead to a solution closest to the typical source. Application of the above methodology to synthetic and real data from the basement relief of a rift basin has asserted its efficacy.

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“…Figure 15 shows the regional Bouguer anomaly map of the Recôncavo Basin, presented by Leão et al (1996). The original survey configuration data have been not available.…”

Section: Application Of the Proposed Methods To Recôncavo Basinmentioning

confidence: 99%

“…Bouguer anomaly assumed to be produced by the Recôncavo Basin basement showing the locations of profile AA' and of the borehole P. After Leão et al (1996).…”

Section: Figure 15mentioning

confidence: 99%

Estimating free parameters in 2D inversion: example of gravity inversion in a rifted basement

Silva

Santos

Monteiro

2019

Geophysical Prospecting

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“…In BOTT'S (1960) method of gravity interpretation, the mathematical geometries of a sedimentary basin were modelled with a series of juxtaposed vertical prisms having equal widths. In the absence of the parameters Figure 4 Schematic cross section of a gravity anomaly profile over a density surface (after RAM BABU 1997) of such basins, MURTHY and RAO (1989), LEÃ O et al (1996O et al ( ), and BARBOSA et al (1997O et al ( , 1999 developed methods using uniform density contrast to trace the basement interfaces from the observed gravity anomalies. On the other hand, in order to determine the sedimentary basin configuration, CORDELL (1973) used the exponential depth-density relation, RAO (1990) proposed a quadratic density function, CHAI and HINZE (1988) developed an iterative algorithm in the frequency domain using an exponential density function, and VISWESWARA RAO et al (1993RAO et al ( , 1994 utilized the parabolic density function.…”

Section: Methodsmentioning

confidence: 99%

Determination of the Crustal and Thermal Structure of the Erzurum-Horasan-Pasinler Basins (Eastern Türkiye) Using Gravity and Magnetic Data

Maden

Aydın

Kadirov

2014

Pure Appl. Geophys.

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The Erzurum-Horasan-Pasinler basin, which surrounds Miocene rocks, is oriented approximately E-W and is located in Eastern Anatolia (Türkiye). East Anatolia, where ophiolitic and young volcanic rocks are widespread, is situated in the Alpine-Himalayan fold-thrust fault belt. The NW-SE trending North Anatolian Transform Fault Zone and the NE-SW trending East Anatolian Transform Fault Zone, formed by the compressional regime of East Anatolia, control the main tectonics of the study region. While the Moho and Conrad depths of the study region are 43.0 and 20.9 km, respectively, the average sedimentary thickness has been determined to be 5.2 km by using the power spectrum method. On the other hand, it is found that the depth of the Moho in the region varies from 41.0 to 44.5 km and the depth of the Conrad discontinuity varies between 22 and 26 km, as computed using empirical equations. The basement of the sedimentary layer is calculated to be 6 km by using inversion results applied to the residual gravity data. The Curie point depth and average heat flow value in this region are calculated as 18.0 km and 89.1 m Wm -2 , respectively. Geotherm calculations reveal that the Moho temperature is 1,028.0°C based on the crustal model. The high heat flow values obtained are attributed to tectonic activities and melting of the lithospheric mantle caused by upwelling of the asthenosphere.

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“…This difficulty is caused not only by the spectral overlap between the gravity or magnetic responses of the shallow and deep sources but also by the arbitrary cut-off frequency of the low-pass or high-pass filter. As a result, no spectral-based approach can overcome this hindrance: 2) regional-residual separation methods, which include: a) filters based on the spectral content of the anomaly (Syberg 1972) and b) polynomial fitting (Rao, Radhakrishna Murthy and Visweswara Rao 1975;Beltrão, Silva and Costa 1991;Leão et al 1996).…”

Section: F U T U R E R E S E a R C Hmentioning

confidence: 99%

“…Robust polynomial fitting (Beltrão et al 1991), on the other hand, minimizes this effect by imposing that the residual anomalies have predominantly a single signal (either positive or negative). The incorporation of this additional a priori information about the residual anomaly greatly improves the performance of the standard polynomial fitting by allowing complex, high-order polynomials to approximate the regional anomaly (e.g., Leão et al 1996).…”

Section: F U T U R E R E S E a R C Hmentioning

confidence: 99%

Reconstruction of geologic bodies in depth associated with a sedimentary basin using gravity and magnetic data

Barbosa

Silva

2011

Geophysical Prospecting

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A B S T R A C TWe present a comprehensive review of the most common gravity and magnetic interpretation methods to in depth retrieval of the geometry of geologic bodies associated with a sedimentary basin. We identify three types of bodies: 1) the sedimentary basement relief, 2) salt bodies and 3) mafic intrusions in a sedimentary section. In reconstructing basement topography through gravity and/or magnetic data we identify three groups of methods: the automatic, the spectral and the nonspectral methods. The reconstruction of salt bodies from gravity data usually uses interactive forward modelling but recently gravity inversion methods have been developed to interpret this kind of geologic environment. Finally, the problem of reconstructing intrusive bodies using magnetic and/or gravity data employs three strategies to interpret mafic or ultramafic intrusions in a sedimentary section: the automatic methods, interactive forward modelling and the inversion methods.

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Gravity inversion of basement relief constrained by the knowledge of depth at isolated points

Cited by 5 publications

References 7 publications

Estimating free parameters in 2D inversion: example of gravity inversion in a rifted basement

Estimating free parameters in 2D inversion: example of gravity inversion in a rifted basement

Determination of the Crustal and Thermal Structure of the Erzurum-Horasan-Pasinler Basins (Eastern Türkiye) Using Gravity and Magnetic Data

Reconstruction of geologic bodies in depth associated with a sedimentary basin using gravity and magnetic data

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