Relevant bibliographies by topics / Residual anomalies and inversion

Academic literature on the topic 'Residual anomalies and inversion'

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Published: 6 September 2023

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Journal articles on the topic "Residual anomalies and inversion"

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Roshan, Ravi, and Upendra Kumar Singh. "Inversion of residual gravity anomalies using tuned PSO." Geoscientific Instrumentation, Methods and Data Systems 6, no. 1 (February 6, 2017): 71–79. http://dx.doi.org/10.5194/gi-6-71-2017.

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Abstract. Many kinds of particle swarm optimization (PSO) techniques are now available and various efforts have been made to solve linear and non-linear problems as well as one-dimensional and multi-dimensional problems of geophysical data. Particle swarm optimization is a metaheuristic optimization method that requires intelligent guesswork and a suitable selection of controlling parameters (i.e. inertia weight and acceleration coefficient) for better convergence at global minima. The proposed technique, tuned PSO, is an improved technique of PSO, in which efforts have been made to choose the controlling parameters, and these parameters have been selected after analysing the responses of various possible exercises using synthetic gravity anomalies over various geological sources. The applicability and efficacy of the proposed method is tested and validated using synthetic gravity anomalies over various source geometries. Finally, tuned PSO is applied over field residual gravity anomalies of two different geological terrains to find the model parameters, namely amplitude coefficient factor (A), shape factor (q) and depth (z). The analysed results have been compared with published results obtained by different methods that show a significantly excellent agreement with real model parameters. The results also show that the proposed approach is not only superior to the other methods but also that the strategy has enhanced the exploration capability of the proposed method. Thus tuned PSO is an efficient and more robust technique to achieve an optimal solution with minimal error.
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Al-Garni, Mansour A. "Inversion of residual gravity anomalies using neural network." Arabian Journal of Geosciences 6, no. 5 (November 22, 2011): 1509–16. http://dx.doi.org/10.1007/s12517-011-0452-y.

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von Frese, R. R. B., D. N. Ravat, W. J. Hinze, and C. A. McGue. "Improved inversion of geopotential field anomalies for lithospheric investigations." GEOPHYSICS 53, no. 3 (March 1988): 375–85. http://dx.doi.org/10.1190/1.1442471.

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Instabilities and the large matrices which are common to inversions of regional magnetic and gravity anomalies often complicate the use of efficient least‐squares matrix procedures. Inversion stability profoundly affects anomaly analysis, and hence it must be considered in any application. Wildly varying or unstable solutions are the products of errors in the anomaly observations and the integrated effects of observation spacing, source spacing, elevation differences between sources and observations, geographic coordinate attributes, geomagnetic field attitudes, and other factors which influence the conditioning of inversion. Solution instabilities caused by ill‐posed parameters can be efficiently minimized by ridge regression with a damping factor large enough to stabilize the inversion, but small enough to produce an analytically useful solution. An effective choice for the damping factor is facilitated by plotting damping factors against residuals between observed and modeled anomalies and by then comparing this curve to curves of damping factors plotted against solution variance or the residuals between predicted anomaly maps representing the processing objective (e.g., downward continuation, differential reduction to the radial pole, etc.). To obtain accurate and efficient large‐scale inversions of anomaly data, a procedure based on the superposition principle of potential fields may be used. This method involves successive inversions of residuals between the observations and various stable model fields which can be readily accommodated by available computer memory. Integration of the model fields yields a well‐resolved representation of the observed anomalies corresponding to an integrated model which normally could not be obtained by direct inversion because the memory requirements would be excessive. MAGSAT magnetic anomaly inversions over India demonstrate the utility of these procedures for improving the geologic analysis of potential field anomalies.
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Hamidy, Ahmad Nor, Ashila Juan Fortuna, Imelda Mar'ata Sholih, Revinda Oktavia, Rabiah Al'Adawiyah, Firdha Kusuma Ayu Anggraeni, and Sri Astutik. "ANALISIS STRUKTUR BAWAH PERMUKAAN GUNUNG IJEN BANYUWANGI." JURNAL PEMBELAJARAN FISIKA 11, no. 3 (October 13, 2022): 93. http://dx.doi.org/10.19184/jpf.v11i3.33323.

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Analysis of the subsurface structure of Mount Ijen, Banyuwangi was carried out based on anomaly data obtained from satellite image data. This research was conducted with the aim of identifying the subsurface structures around the research site. In this study, what is determined is the complete Bouguer anomaly (ABL), regional and residual anomalies based on the ABL, and their inversion modeling. The results of the representation of underground structures based on residual anomalies obtained from complete and regional Bouguer anomaly data. The complete bouguer anomaly values obtained in the Mount Ijen area range from 12.2 to 110.7 mGal. In the process of separating regional and residual anomalies, different anomaly values are produced. The regional anomaly value ranges from +12.2 to +110.7 mGal while the residual anomaly ranges from -4.2 to +2.4 mGal
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Abdelrahman, El-Sayed M., Eid R. Abo-Ezz, and Khalid S. Essa. "Parametric inversion of residual magnetic anomalies due to simple geometric bodies." Exploration Geophysics 43, no. 3 (September 2012): 178–89. http://dx.doi.org/10.1071/eg11026.

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Becht, Andreas, Jens Tronicke, Erwin Appel, and Peter Dietrich. "Inversion strategy in crosshole radar tomography using information of data subsets." GEOPHYSICS 69, no. 1 (January 2004): 222–30. http://dx.doi.org/10.1190/1.1649390.

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Detecting discrete anomalies, such as cavities or tunnels, is an important application of crosshole radar tomography. However, crosshole tomographic inversion results are frequently ambiguous, showing smearing effects and inversion artifacts. These ambiguities lead to uncertainties in interpretation; hence, the size and position of anomalies can only be interpreted with limited accuracy and reliability. We present an inversion strategy for investigating discrete anomalies with crosshole radar tomography. In addition to the full traveltime data set, we use subsets of specified ray‐angle intervals for tomographic inversion. By analyzing inversion results from different ray‐angle intervals, a more accurate interpretation of anomalies is possible. The second step of our strategy is to develop a good inhomogeneous starting model from joint interpretation of the inversion results from different subsets. The third step is to invert the full data set using this new starting model and to evaluate the inversion results by analyzing the distributions of mean square traveltime residuals with respect to the ray angles. We use a synthetic model with two discrete anomalies located roughly at the same depth to demonstrate and evaluate our approach. This inversion strategy is also applied to a field data set collected to investigate karst cavities in limestone. From the inversion results of both examples, we show that horizontal smearing of anomalies can be reduced by eliminating near‐horizontal rays. A good starting model can be obtained based on the joint interpretation of the inversion results of the different subsets; it leads to a high‐resolution final image of the full data set.
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Liu, Jie, Jianzhong Zhang, Li Jiang, Qi Lin, and Li Wan. "Polynomial-based density inversion of gravity anomalies for concealed iron-deposit exploration in North China." GEOPHYSICS 84, no. 5 (September 1, 2019): B325—B334. http://dx.doi.org/10.1190/geo2018-0740.1.

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Inversion of residual gravity anomalies is an important geophysical technique for depicting subsurface density contrasts, for example, for mineral deposits. We have expressed subsurface density variations using depth-variable polynomial functions and developed the polynomial coefficient inversion (PCI) method, which is an alternative method for mapping subsurface density distributions by inverting the coefficients of density-contrast functions. PCI enables the linear inversion of density variations without vertically subdividing the subsurface. Synthetic tests indicate that PCI combines polynomial functions and multiple constraints to highlight the anomalous masses through an iterative process with appropriate weighting parameters. We apply our method to a local investigation of banded iron formation (BIF) deposits in the Hebei Province, North China. The inversion results depict the approximate distribution of the subsurface density contrasts to identify the stratigraphic boundaries of different lithologies and BIF-favorable zones, thus implying that local iron-rich ore bodies may be located at the syncline axis or dip along the faults. The successful application of PCI for the BIF deposits indicates that this method is a promising strategy for density mapping.
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Lv, Qijun, Aiping Zheng, Xiangjin Liang, Hongfei Chen, Shichang Ju, Yanchong Meng, Hongyuan Zhang, Guolin He, Shenshen Deng, and Junfang Li. "Research on Remaining Oil Characterization in Superheavy Oil Reservoir by Microgravity Exploration." Geofluids 2022 (July 18, 2022): 1–10. http://dx.doi.org/10.1155/2022/1210780.

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Some physical processes such as oil and gas development, metal deposit collection, and groundwater resource migration can cause density changes, for which microgravity monitoring is the most intuitive method to monitor the density change process. Based on the basic principle of microgravity measurement and the idea of multiscale separation, a multiscale, second-order, surface-fitting, residual gravity anomaly extraction method is proposed to separate superimposed microgravity fields. In this method, regional fields of different scales are fitted and calculated successively with the measurement points as the center, so as to separate the gravity anomalies produced by different-depth density bodies. Results from actual data show that this method extracts the reservoir’s residual density characteristics of plane gravity anomaly on the basis of remaining oil distribution characteristics, consistent with reservoir numerical simulation results. A three-dimensional least-squares inversion of the method for extracting residual gravity anomaly was carried out, with the inversion results consistent with the results of vertical remaining oil distribution characteristics and well-test production results.
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Sehah, Sehah, Urip Nurwijayanto Prabowo, Sukmaji Anom Raharjo, and Aina Zahra Ikhwana. "Physical modeling of magma chamber of slamet volcano by means of satellite gravimetric data." Communications in Science and Technology 7, no. 2 (December 28, 2022): 160–67. http://dx.doi.org/10.21924/cst.7.2.2022.1001.

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Slamet Volcano (3,432 m) is the highest volcano in Central Java, Indonesia, with a weak explosive type of eruption compared to other active volcanoes. Designing the magma chamber model may help reveal the characteristics of Slamet Volcano. The modelling uses the gravimetric satellite data from GGMplus, which is best in spatial resolution compared to other satellite data, i.e. 220 m. Data processing begins with Bouguer correction and terrain correction and has resulted in complete Bouguer anomalies data, with values ranging from 11.068 – 117.451 mGal. Further, residual Bouguer anomalies data were obtained after data reduction to the horizontal surface and removal of regional anomalies data, to obtain values ranging from -67.569 – 38.808 mGal. The residual anomaly contour map shows the lowest anomalous value is under the volcanic cone at positions of 109.21967° E and 7.24281° S which is estimated to be the location of the magma chamber of Slamet Volcano. However, the inversion modeling resulting from the residual Bouguer anomalies data shows that the magma chamber of Slamet Volcano can be observed clearly at positions of 109.22053° E and 7.24719° S. The location of the magma chamber is not perfectly vertical under the volcanic cone but has a slight slope. The obtained model of the magma chamber has a relatively small volume and shallow depth, i.e. about 1 – 4 km. The obtained physical parameters of the magma chamber impact the characteristics of the eruption of Slamet Volcano which tend to be weak explosive.
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Eshaghzadeh, Ata, Alireza Dehghanpour, and Sanaz Seyedi Sahebari. "Marquardt inverse modeling of the residual gravity anomalies due to simple geometric structures: A case study of chromite deposit." Contributions to Geophysics and Geodesy 49, no. 2 (June 1, 2019): 153–80. http://dx.doi.org/10.2478/congeo-2019-0008.

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Abstract In this paper, an inversion method based on the Marquardt’s algorithm is presented to invert the gravity anomaly of the simple geometric shapes. The inversion outputs are the depth and radius parameters. We investigate three different shapes, i.e. the sphere, infinite horizontal cylinder and semi-infinite vertical cylinder for modeling. The proposed method is used for analyzing the gravity anomalies from assumed models with different initial parameters in all cases as the synthetic data are without noise and also corrupted with noise to evaluate the ability of the procedure. We also employ this approach for modeling the gravity anomaly due to a chromite deposit mass, situated east of Sabzevar, Iran. The lowest error between the theoretical anomaly and computed anomaly from inverted parameters, determine the shape of the causative mass. The inversion using different initial models for the theoretical gravity and also for real gravity data yields approximately consistent solutions. According to the interpreted parameters, the best shape that can imagine for the gravity anomaly source is the vertical cylinder with a depth to top of 7.4 m and a radius of 11.7 m.
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Dissertations / Theses on the topic "Residual anomalies and inversion"

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Kaufmann, Ronald Douglas. "Joint inversion of travel-time residuals and gravity anomalies for the velocity structure of Southest Tennessee." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/25730.

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Fischer, Doreen [Verfasser]. "Sparse regularization of a joint inversion of gravitational data and normal mode anomalies / Doreen Fischer." Siegen : Universitätsbibliothek der Universität Siegen, 2011. http://d-nb.info/1019880341/34.

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Jordan, Tom A. R. M. "Gravity anomalies, flexure, and the long-term rigidity of the continental lithosphere." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:9f803b42-522e-442b-9849-bb8e6c2a5494.

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The cause and distribution of spatial variations in the mechanical properties of the continental lithosphere are fundamental questions for modern geology. In this study variations in long-term lithospheric rigidity have been investigated. These investigations used profile- and grid-based flexural models of the lithosphere’s response to geologically imposed topographic, or buried, loads. These models were constrained by topographic and gravity data allowing recovery of best fitting rigidity values. In Oman a Cretaceous ophiolite acts as a significant load on the continental crust. Flexural models along profiles orthogonal to the ophiolite strike show that the observed gravity data can be best modelled by an elastic beam with standard thickness (Te) of 30 km. Along strike there is shown to be significant variation in the foreland shape and the observed gravity signal. This, it is proposed, relates to the complex tectonic processes which occurred as the ophiolite was obducted. The Himalayan foreland has been the focus of controversy over the recovered long-term rigidity of the continents, with recovered Te values ranging from 40 to over 90 km. Both profile- and grid-based techniques show that Te is high (>70 km) in the foreland region. Across the India-Eurasia collisional system as a whole Te values are variable. Beneath the Tibetan plateau recovered values are generally low (<10 km), while the plateau margins are marked by regions of higher rigidity. Recovered Te values across the Arabia-Eurasia collisional system range from over 60 km in the foreland region to close to zero beneath the high Zagros mountains. In the eastern part of the foreland, flexural models match the gravity data; however, they disagree with sediment thickness data for the material infilling the foreland. This discrepancy is interpreted in terms of de-coupling of the flexural lithosphere from the shallower crustal levels, caused by the presence of significant salt deposits in this region. Application of grid-based techniques to South America, North America and Europe recover a broad range of Te values from ∼0 to over 90 km. The low Te values are explained in active orogenic belts in terms of current processes acting to weaken the lithosphere, and in the continental interiors as the relics of past orogenic events. High Te values in the continental interiors correlate with ancient cratonic cores which have undergone little deformation since their formation in the Archean. This study shows that Te variations have a critical influence on the development of large compressional orogenic belts. In the Himalayan and Andean orogens there is a correlation between the over-thrusting of the orogenic belt and high Te foreland regions. Where lower Te regions are seen, less over thrusting is apparent, and in the case of the India-Eurasia collisional system out-flow of lower crustal material may be occurring.
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Pouliquen, Gaud. "Les anomalies magnétiques marines : contraintes sur les variations courtes périodes des processus de l'accrétion et de l'intensité du champ magnétique terrestre." Paris 7, 2001. http://www.theses.fr/2001PA077236.

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Sadriji, Besnik. "Analysis and characterization of the damage phenomena occurring from handling and service surface anomalies." Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPAST082.

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Ces travaux de thèse ont porté sur l'étude des phénomènes d'endommagement induits par l'introduction d'anomalies de surface de type choc ou rayure, lors d'opérations de maintenance des disques de turbine haute pression. D'une part, ces dernières créent une concentration de contraintes en fond d'anomalie liée au défaut géométrique, qui, couplée à la sévérité des chargements thermomécaniques subits par les disques, amène à l'amorçage et la propagation d'une fissure courte. D'autre part, ces anomalies s'accompagnent de déformations dans la matière qui induisent de l'écrouissage et des contraintes résiduelles. Ces dernières ont un effet du premier ordre sur la propagation de la fissure qu'il est nécessaire de prendre en compte. Ainsi l'objectif est de caractériser ces phénomènes induits par l'introduction des anomalies de surface, à savoir le comportement d'une fissure courte dans un champ de contraintes résiduelles.Concernant la caractérisation du comportement d'une fissure courte, une campagne expérimentale novatrice a été mise en place. Lors de cette dernière, des essais de fatigue uniaxiaux et biaxiaux ont été réalisés ainsi que des simulations numériques de propagation de fissure. D'une part, cette campagne expérimentale permet de mettre en exergue l'effet de la contrainte T sur la propagation de fissure. D'autre part, elle fournit un protocole expérimental permettant d'obtenir des fissures courtes et de caractériser leur comportement. Enfin, elle donne des pistes vers la prise en compte de l'effet de fissure courte via la contrainte T.Dans le but de caractériser les contraintes résiduelles, une campagne de caractérisation par diffraction des rayons X à l'European Synchrotron Radiation Facility (ESRF) de Grenoble a été menée. La mesure des distances interatomiques permet de déterminer les déformations puis les contraintes résiduelles induites par l'anomalie. Les résultats obtenus sont cohérents avec ce qui était attendu : de forts niveaux de contraintes multiaxiales, de forts gradients et une portée sous la surface conséquente. Le modèle d'introduction de choc a été amélioré afin de pouvoir le comparer avec les résultats expérimentaux.Une stratégie d'intégration de ces différents phénomènes dans un modèle incrémental est proposé dans les perspectives afin de tenir compte de la fissuration causée par des anomalies de surface
This research work concerns the study of the induced physical phenomena by the introduction of handling surface anomalies such as dents or scratches, on high pressure turbine disks. On one hand, they create a geometrical stress concentration at the anomaly root and combined with the severe thermomechanical loadings undergone by the disks, leads to a short crack initiation and propagation. On the other hand, these anomalies induce deformations which lead to hardening and residual stresses in the material. The latter have an important influence on the crack propagation and is necessary to take into account. Thus, the aim is to characterize these phenomena induced by the introduction of surface anomalies, namely the short crack effect and the residual stress field.For the short crack effect characterization, a pioneering experimental campaign has been set up implying uniaxial and multiaxial fatigue tests as well as numerical simulations in crack propagation. This experimental campaign highlights the T-stress effect on the crack propagation first. Then, it gives an experimental protocol to obtain short cracks and characterize their behavior. Finally, it gives a lead to take into account the short crack effect via the T-stress.With the aim of characterizing the residual stress field, Synchrotron X-ray diffraction measurements have been performed at the European Synchrotron Radiation Facility (ESRF) at Grenoble. The determination of the interatomic distances allows to determine the strains and the induced residual stresses by the anomaly. The results show important 3D stress levels, gradients and a substantial in-depths extent, as expected. The numerical model of a dent introduction has been improved to compare the experimental results with.A strategy to take into account these phenomena in the Incremental model is given in the perspectives in order to consider crack propagation from surface anomalies
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El, Zaiat Maëva. "Cibles et voies de signalisation régulées par FOXL2 au cours de la morphogenèse ovarienne." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS035/document.

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FOXL2 est un facteur de transcription crucial pour la fonction ovarienne. Dans l'espèce humaine, des mutations hétérozygotes de ce gène sont responsables de la survenue d'un syndrome associant des malformations des paupières à une insuffisance ovarienne prématurée. De même chez la souris, l'invalidation totale de Foxl2 conduit à un blocage de la folliculogenèse et donc à une infertilité femelle. Chez la chèvre, la mutation Polled Intersex Syndrome (PIS) engendre le silence transcriptionnel de FOXL2 dans les gonades XX PIS-/- ce qui conduit à une inversion sexuelle et à la différenciation de testicules à la place d'ovaires chez les animaux génétiquement femelles homozygotes pour la mutation (inversion sexuelle de type mâle XX). FOXL2 est donc déterminant pour la différenciation ovarienne très précocement au cours du développement dans l'espèce caprine, alors qu'il ne semble impliqué que plus tardivement dans l'établissement de la fertilité chez la souris et la femme. Afin de comprendre ces différences entre espèces, nous avons recherché quels étaient les gènes et les voies de signalisation régulés par FOXL2 dans l'ovaire de chèvre au début de sa différenciation. Grâce à un séquençage à haut-débit des transcrits présents dans trois types de gonades caprines (testicules XY, ovaires XX et gonades XX PIS-/- (qui n'expriment pas FOXL2)) au début de leur différenciation, nous avons pu (i) mieux caractériser le rôle de FOXL2 dans l'ovaire caprin et montrer qu'il y agit avant tout comme un facteur anti-testiculaire, et (ii) mettre en évidence de nouveaux gènes pro-ovariens comme DMXL2 et étudier son rôle putatif dans la fonction ovarienne grâce à des expériences fonctionnelles chez la souris
FOXL2 is a transcription factor which is crucial for the ovary. In humans, heterozygous mutations are responsible for the BPES syndrome characterized by eyelid anomalies and premature ovarian failure. Similarly in mice, Foxl2 invalidation leads to complete folliculogenesis disruption and female infertility. In the goat, the Polled Intersex Syndrome mutation is responsible for the transcriptional silencing of FOXL2 in XX PIS-/- gonads that leads to female-to-male sex reversal and the differentiation of testes instead of ovaries in genetically female animals homozygous for the mutation. Thus, FOXL2 is determining for ovarian differentiation early during development in goats, whereas it is involved in fertility tardily in mice and women. In order to understand these species-specific differences, we searched for the genes and pathways regulated by FOXL2 in early goat ovaries. Thanks to RNA-sequencing of goat XY testes, XX ovaries and XX PIS-/- gonads (lacking FOXL2) at the beginning of their differentiation, we were able to (i) better characterize the role of FOXL2 in goat ovaries and show that it acts mainly as an anti-testis factor, and (ii) highlight new pro-ovarian genes like DMXL2, and study its putative role during ovarian development using functional experiments in the mouse
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Braga, Luiz F. S. "Isostatic evolution and crustal structures of the Amazon continental margin determined by admittance analyses and inversion of gravity data." Thesis, 1991. http://hdl.handle.net/1957/29265.

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Renkin, Miriam L. "Age, depth, and residual depth anomalies in the North Pacific implications for thermal models of the lithosphere and upper mantle /." 1986. http://catalog.hathitrust.org/api/volumes/oclc/48567944.html.

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Cocchi, L. "Magnetic structural evidences of the 41° parallel zone (Tyrrhenian Sea) inferred from potential field data: the 3D model of the discontinuity." Thesis, 2007. http://hdl.handle.net/2122/4561.

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Potential field data hold a leading role in the geologic-structural application. Their use becomes even more important if applied to extremely inaccessible zones as oceanic basins or no-antropized area. By an areo-naval survey it is possible to cover large areas, in a short time, to define their deep crustal features that are otherwise not accessible by other direct methods. The analysis of the magnetic field data is particularly effective in the study of the crustal portions characterized by lateral variation of the magnetic susceptibility. The magnetic analysis is often applied to areas where sub-volcanic bodies or relic portion of oceanic nature in sedimentary deposits are located. The aim of this thesis is the development of a tridimensional model about the 41st parallel zone starting from potential field data. The name 41st parallel indicates a geographic zone aligned along N41st of latitude. This area is longitudinally defined between the Continental Campanian Margin (Naplean Gulf, Ischia and Procida island) and the northwestern portion of the Sardinia Island. From a geological point of view, the 41st parallel represents a complicate area. Several geological structures are located along this zone: submerged volcanic bodies such as the Etruschi, Vercelli and Cassinis seamounts, emerged edifices connected to the Pliocenic-Quaternary volcanism of the Central Tyrrhenian sea (Palmarola, Zenone, Ponza, Ischia and Procida) and several deep fault structures such as the E-W fault of Ponza. The formation and the development of this particular zone is not clear and is still object of discussion in literature. The structural setting of 41st parallel zone is highlighted only by magnetic field data. By the observation of the magnetic anomalous field it is possible to see an alignment of several magnetic anomalies along the N41st latitude. These anomalies take place on the main structural evidences of the area. The bathymetric data and information don't suggest these features. To this aim, I use the magnetic data to analyse in quantitative way, the 41st parallel zone. The magnetic data used for the development of the 3D magnetic model derived by the dataset of the Aeromagnetic Anomaly Map of Italy (Caratori Tontini et al., 2004). The original magnetic dataset includes the total intensity field of Italy and its surrounding seas acquired partly during the aeromagnetic surveys performed by Agip (now Eni-Spa) between 1971 and 1980 and during new surveys in the years 2001-2002(Eni,Exploration & Production Division - Igmar, La Spezia). The magnetic data were recorded, in a homogeneous way, by using a cesium-magnetometer. By the successive reprocessing of the row magnetic data the revised magnetic anomaly map is obtained showing a strong informative contribution and a good agreement with the sea-level map of Chiappini et al. (2002). In the first chapter of this thesis I describe the geological and structural features of the Tyrrhenian sea in general way. However, I analyse the 41st parallel zone starting from the literature data. In the second chapter I evaluate the Bouguer gravity field of the Tyrrhenian Sea by using two methodologies for an evaluation of the optimal Bouguer reduction density. Using a free-air gravimetric satellite data set of the Tyrrhenian sea, I perform a map of isostatic level of the central Tyrrhenian area. In the third chapter I describe the properties of the Geomagnetic field and its representation focusing my interest on the time and spatial dependencies of the field. The successive section provides information about the row magnetic data used for the quantitative elaboration describing the characteristics of the anomaly field of the studied area. In the fifth chapter, the properties of the magnetic signal is studied by using a statistical analysis of the power spectrum (Spector and Grant, 1970) and by the Continuous Wavelet Transform. After these analyses, in the sixth chapter I introduce the concept of magnetic basement and the relationship between magnetic signal and temperature. Starting from the regional heat-flow data (Della Vedova et al., 2001) of the Central Tyrrhenian area the Curie Isotherm surface is modeled defining the maximum depth of the magnetic-thermal basement. The boundaries of the magnetic sources (top and bottom) represents the base-line for the successive phases of quantitative analysis. By using a 2D inversion algorithm I obtain the map of apparent susceptibility. In the seventh chapter, I apply this algorithm to the magnetic evidence of the 41st parallel zone and to the Selli Line region. This procedure suggests a distribution of magnetization that permits to connect the 41st parallel zone and the structural elements of the Southern Tyrrhenian Sea such as the Magnaghi Basin and the Selli Line faults system. Starting form the results obtained by the apparent magnetization maps, I perform a 3D inversion of magnetic data providing information about the vertical distribution of the sources. In the eighth chapter, that represents an important part of the thesis, I introduce the inverse problem in the potential field analysis by a new 3D algorithm capable to evaluate the depth to the bottom of the source. Then, I apply this algorithm to the real magnetic dataset of the 41st and Selli Line regions. The recovered models show the shape, location in depth and direction of development of the magnetic generating sources suggesting the geometric relationship between the different sources. These information are important for evaluating the crustal setting of the study area. Finally, in the last chapter I interpret the results of inversion process evaluating the relationship between the 41 st parallel and the Selli Line region. Starting from the magnetic recovered models of these two regions I provide a chronological reconstruction of the geodynamic evolution of the Central Tyrrhenian Sea.
Università di Bologna
Unpublished
3.3. Geodinamica e struttura dell'interno della Terra
3.4. Geomagnetismo
3.5. Geologia e storia dei sistemi vulcanici
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Books on the topic "Residual anomalies and inversion"

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Heywood, Charles E. Isostatic residual gravity anomalies of New Mexico. Albuquerque, N.M: U.S. Dept. of the Interior, U.S. Geological Survey, 1992.

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Robbins, S. L. Complete Bouguer and isostatic residual gravity maps of the Anadarko Basin, Wichita Mountains, and surrounding areas, Oklahoma, Kansas, Texas, and Colorado. Denver, CO: U.S. G.P.O., 1992.

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Robbins, Stephen L. Complete Bouguer and isostatic residual gravity maps of the Anadarko Basin, Wichita Mountains, and surrounding areas, Oklahoma, Kansas, Texas, and Colorado. Washington: U.S. G.P.O., 1992.

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Robbins, S. L. Complete Bouguer and isostatic residual gravity maps of the Anadarko Basin, Wichita Mountains, and surrounding areas, Oklahoma, Kansas, Texas, and Colorado. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1992.

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Heywood, Charles E. Estimation of alluvial-fill thickness in the Mimbres ground-water basin, New Mexico, from interpretation of isostatic residual gravity anomalies. Albuquerque, N.M: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Heywood, Charles E. Estimation of alluvial-fill thickness in the Mimbres ground-water basin, New Mexico, from interpretation of isostatic residual gravity anomalies. Albuquerque, N.M: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Heywood, Charles E. Estimation of alluvial-fill thickness in the Mimbres ground-water basin, New Mexico, from interpretation of isostatic residual gravity anomalies. Albuquerque, N.M: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Heywood, Charles E. Estimation of alluvial-fill thickness in the Mimbres ground-water basin, New Mexico, from interpretation of isostatic residual gravity anomalies. Albuquerque, N.M: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Heywood, Charles E. Estimation of alluvial-fill thickness in the Mimbres ground-water basin, New Mexico, from interpretation of isostatic residual gravity anomalies. Albuquerque, N.M: U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Heywood, Charles E. Estimation of alluvial-fill thickness in the Mimbres ground-water basin, New Mexico, from interpretation of isostatic residual gravity anomalies. Albuquerque, N.M. (5338 Montgomery Blvd., NE, Suite 400, Albuquerque, 87109-1311): U.S. Geological Survey, 2002.

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Book chapters on the topic "Residual anomalies and inversion"

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Gobashy, Mohamed, and Maha Abdelazeem. "Metaheuristics Inversion of Self-Potential Anomalies." In Self-Potential Method: Theoretical Modeling and Applications in Geosciences, 35–103. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79333-3_2.

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Marobhe, I. M. "Optimisation of Magnetic Anomalies via Singular Value Decomposition." In Geophysical Data Inversion Methods and Applications, 171–88. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-89416-8_11.

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Mallick, K., A. Vasanthi, and K. K. Sharma. "Regional and Residual Gravity Anomalies: The Existing Issues." In Bouguer Gravity Regional and Residual Separation: Application to Geology and Environment, 9–18. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-0406-0_2.

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Marcak, H., and A. Leśniak. "Estimation of the Source Model Parameters for Thermal Anomalies in South Silesia." In Geophysical Data Inversion Methods and Applications, 605–20. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-89416-8_36.

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Holland, Stephen D. "Model Based Inversion for Pulse Thermography." In Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 7, 43–45. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95074-7_8.

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Obata, Yuri, and Satoru Yoneyama. "Inversion of Residual Stresses in Silicon Wafer from Surface Deflection Measurements." In Residual Stress, Thermomechanics & Infrared Imaging and Inverse Problems, Volume 6, 75–81. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-30098-2_11.

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Ballard, P., and A. Constantinescu. "On the Inversion of Subsurface Residual Stresses from Surface Stress Measurements." In Solid Mechanics and Its Applications, 285–92. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4738-5_34.

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Motao, Huang, Zhai Guojun, Bian Shaofeng, Ouyang Yongzhong, Liu Yanchun, and Liu Chuanyong. "Comparisons of Three Inversion Approaches for Recovering Gravity Anomalies From Altimeter Data." In International Association of Geodesy Symposia, 151–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-18861-9_18.

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Nair, Sanjiv, and Sunil S. Shroff. "Vascular Anomalies of the Oro-Maxillofacial Region." In Oral and Maxillofacial Surgery for the Clinician, 629–58. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-1346-6_31.

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Abstract:
AbstractVascular anomalies is a diverse group of disorders involving the vasculature (arteries,veins and lymphatics). These lesions in the head and neck can present since birth or later in life causing functional, cosmetic and bleeding problems. They can sometimes co-exist with a wide array of other pathologies and components of various syndromes. The different types, classifications, clinical features, imaging characteristics, treatment options and complications will be discussed in detail, with accordance to guidelines and principles in current literature. The author has designed a widely accepted anatomical classification for surgical management of these complex lesions, which is discussed in depth. Tailoring therapy depending on the anomaly is the key to successful treatment. Hemangiomas tend to proliferate and then involute , hence treated with systemic medication or alternate therapy for residual lesions. Vascular Malformations essentially would require aggressive management with surgery or embolisation and surgery. The concept of ‘corset suturing’ is explained and described, which is thought to be the ideal management for large venous malformations.
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Schäfer, Uwe, and Peter I. Balk. "The Inversion of Potential Field Anomalies by the Assembling Method: The Third Dimension." In Geodesy and Physics of the Earth, 237–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78149-0_56.

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Conference papers on the topic "Residual anomalies and inversion"

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Alkaabi, Ahmed Saeed, Stephane Yves Anthoine, Muhammad Waqas, Fatima Ali Aljaberi, Sung Yuh, Tom Blanchard, Adeoye Adeyemi, Konstantin Bykov, and Andrea Grandi. "4D Seismic Monitoring With Non-Repeated OBC Geometries in Late Jurassic Carbonate Reservoir From Offshore Abu Dhabi." In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212708-ms.

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Abstract One of the proven technologies for reservoir monitoring is 4D (time-lapse) seismic. It allows tracking the fluid front for water & gas and detecting pressure & density changes. Although 4D seismic monitoring is challenging in the Middle Eastern carbonate reservoirs, dealing with non-repeated acquisition geometries pose additional challenges. This paper will present how the 4D seismic processing methods and techniques were applied to overcome the following challenges from an offshore Jurassic carbonate oil and gas field: Seismic acquisition geometry differences between the two surveys leading to strong 4D noise related to repeatability issuesMultiple contamination especially in shallow water environment (water depth ranges from 15 to 25m) Cascaded application of denoise and demultiple procedures were performed. Different types of migration were conducted too. In order to overcome specifically acquisition geometry differences between legacy and monitor surveys, Least-Squares Migration algorithm was applied to 4D datasets. 4D Least-Squares migration showed better 4D inversion results compared with the ones from Kirchhoff migration. As 4D inversion signal has the same order of magnitude as 4D noise, additional information such as geology and well production data were required to discriminate 4D signal from noise. Nevertheless, some areas still suffer from residual multiples that generate strong and low frequency noise in 4D inversion results. However, many 4D seismic anomalies were validated as 4D signal mainly corresponding to 4D P-impedance increase which were nicely matched with water cut observed at wells and with water saturation from reservoir simulation. As a general observation, the water rise observed in 4D seismic inversion results was higher (shallower) than dynamic model water rise. In addition, 4D water rise showed heterogeneous water paths compared to the uniform one in the dynamic model. 4D interpretation results were integrated in the reservoir model.
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Carvalho, Ana, Ricardo Ribeiro, Rui Moura, and Alexandre Lima. "GEOPHYSICAL EXPLORATION OF ANTIMONY MINERALIZATIONS: ALTO DO SOBRIDO AND RIBEIRO DA SERRA MINES (PORTUGAL)." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/1.1/s03.033.

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The Alto do Sobrido and Ribeiro da Serra Mines, are two antimony-gold mines located in Gondomar, Portugal, and are part of the Durico-Beirao Mining District (DBMD). In this work, we use four geophysical methods, such as gravity, radiometry, magnetic and electromagnetic, to improve the knowledge about these mineralizations and the lithologies and structures associated with them. These four methods allowed us to study these mineralizations through different physical properties. The gravimetric method allowed us to add more data to the hypothesis that the goldantimony mineralizations of the DBMD could be genetically associated with a nonoutcropping granite intrusion, which functioned either as a heat engine that promoted the circulation of fluids and/or as a source of fluids and metals itself. A 2D model was proposed, created with both modelling and inversion, to show that the presence of this granite could indeed fit the response of the negative anomalies found in the residual anomaly. The radiometric method was used mainly as a mapping tool, where we were able to distinguish between some of the lithologies of the area, like the Lower Ordovician quartzites and the metasediments of the Middle Ordovician to the Carboniferous, but also to observe different element concentrations within the Pre-Ordovician SchistGreywacke Complex (SGC). These variations within the SGC lithology don�t have a clear explanation as to why they occur. Still, we believe that they could occur due to the influence of the abovementioned non-outcropping granite. With the very low frequency (VLF) electromagnetic method, it was possible to locate areas of lower resistivities that correspond to the location of several known mineralized veins, as well as the probable location for a new vein. It was also possible to observe some weathered rocks near faults and fractures associated with the Durico-Beirao Shear Zone (DBSZ). With the magnetic method, it is possible to contribute to areas with the prevalence of lithologies and minerals with higher magnetic susceptibilities. Several magnetic anomalies found near the Alto do Sobrido mining works correspond to the mineralized veins paragenesis. Other anomalies appear to be related to the location of faults and fractures associated with the DBSZ. The use of all these methods allowed us to observe the mineralization responses and its associated lithologies and structures through the different geophysical properties while adding knowledge about the genesis of these mineralizations and possibly the location of new mineralized veins.
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Belkhatir, Z., T. M. Laleg-Kirati, and M. Tadjine. "Residual generator for cardiovascular anomalies detection." In 2014 European Control Conference (ECC). IEEE, 2014. http://dx.doi.org/10.1109/ecc.2014.6862573.

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Neckludov, D., R. Baina, and E. Landa. "Residual stereo‐tomographic inversion." In SEG Technical Program Expanded Abstracts 2005. Society of Exploration Geophysicists, 2005. http://dx.doi.org/10.1190/1.2148245.

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Abdelqader, Mahmoud, Sameh Hamama, Usama Abdelqader, Arindam Kanrar, Refaat Zaki, and Mahmoud Eloribi. "Improving the Imaging of Pre-Messinian Reservoirs in the East Mediterranean Sea, Offshore Egypt, Using Converted Wave Attenuation, Full-Waveform Inversion and Reflection Tomography." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-21874-ea.

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Abstract The offshore eastern Mediterranean region has received increased international interest in the last decade for its hydrocarbon potential in the pre-salt traps. The presence of a heterogeneous Messinian-age salt layer and complex pre-Messinian structures pose very difficult challenges in seismic imaging. In this paper, we provide a detailed workflow for seismic data preconditioning and imaging which resolves the subsurface challenges of the Mediterranean. Broadband acquisition was used to collect seismic data, which combines the responses of dual-sensor receivers to remove the effect of the receiver ghost. Adaptive source de-ghosting was then applied to address the source-side ghost. Data was processed using robust multiple attenuation and converted wave attenuation (CWA). A high-resolution velocity model building and imaging workflow was designed as follows: Diving waves full-waveform inversion (FWI) to capture detailed velocity for the complex overburden, followed by post-salt reflection tomography. Born modeling-based reflection FWI to update the velocity heterogeneities inside the salt body followed by reflection tomography for the deep section. Reverse time migration (RTM) to handle the waveform multi-pathing. De-ghosting corrected the wavelet phase and expanded the usable frequency bandwidth, resulting in a broadband dataset for imaging. Robust multiple attenuation and converted wave attenuation (CWA) techniques aided in revealing the true geological dips beneath the salt and facilitated picking accurate residual move-outs during the velocity model building. RTM in conjunction with the high-resolution velocity model significantly improved imaging of complex salt structures and pre-salt reservoirs. At well locations, our workflow resulted in a very good match between the available well data and surface seismic in terms of markers depths and velocity trends. This paper presents a novel approach for modelling the velocity heterogeneities inside the complex Messinian-age salt formation using the Born modeling-based reflection FWI. In addition, salt-related strong converted waves were successfully attenuated, whereas previously the presence of this energy misled interpreters and caused anomalous velocity updates in similar geological settings in the Mediterranean.
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Arkani-Hamed, J., and D. W. Strangway. "Inversion of scalar magnetic anomalies of regional scale to crustal magnetization anomalies." In 1985 SEG Technical Program Expanded Abstracts. SEG, 1985. http://dx.doi.org/10.1190/1.1892713.

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Belashov, O., G. Lecant, and S. Baptiste. "Consideration of Velocity Anomalies During Seismic Inversion." In 6th Saint Petersburg International Conference and Exhibition. Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20140155.

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Vyas, Madhav, and John Etgen. "Residual Redistribution for Robust Inversion." In SEG Technical Program Expanded Abstracts 2017. Society of Exploration Geophysicists, 2017. http://dx.doi.org/10.1190/segam2017-17664619.1.

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Stavrev, Petar, and Daniela Gerovska. "Euler inversion of magnetic anomalies using analytical continuation." In SEG Technical Program Expanded Abstracts 2004. Society of Exploration Geophysicists, 2004. http://dx.doi.org/10.1190/1.1851316.

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White, R. E., and A. ‐S Barnola. "Optimised detection and unbiased inversion of AVO anomalies." In SEG Technical Program Expanded Abstracts 2003. Society of Exploration Geophysicists, 2003. http://dx.doi.org/10.1190/1.1817724.

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Reports on the topic "Residual anomalies and inversion"

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Johnson, Kyle, Joseph E. Bishop, Phillip L. Reu, Timothy Walsh, Paul Abraham Farias, Bradley Howell Jared, Donald F. Susan, et al. Development of a Generalized Residual Stress Inversion Technique. Office of Scientific and Technical Information (OSTI), November 2019. http://dx.doi.org/10.2172/1574171.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic total field and electromagnetic anomalies, Pamour, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213895.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic total field and electromagnetic anomalies, Buskegau River, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/220501.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic total field and electromagnetic anomalies, Manning Lake, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213888.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic total field and electromagnetic anomalies, Kamiskotia Lake, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213894.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic field contours and em anomalies with Keating coefficients, 42A/11NE, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213878.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic field contours and em anomalies with Keating coefficients, 42A/11NW, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213879.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic field contours and em anomalies with Keating coefficients, 42A/12NE, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213880.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic field contours and em anomalies with Keating coefficients, 42A/13SE, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213881.

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Dumont, R., M. Coyle, D. Oneschuk, and J. Potvin. Residual magnetic field contours and em anomalies with Keating coefficients, 42A/13NE, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/213882.

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