Relevant bibliographies by topics / Gravity field anomalies

Academic literature on the topic 'Gravity field anomalies'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Gravity field anomalies"

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Apeh, O. I., E. C. Moka, and V. N. Uzodinma. "Evaluation of Gravity Data Derived from Global Gravity Field Models Using Terrestrial Gravity Data in Enugu State, Nigeria." Journal of Geodetic Science 8, no. 1 (December 1, 2018): 145–53. http://dx.doi.org/10.1515/jogs-2018-0015.

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Abstract Spherical harmonic expansion is a commonly applied mathematical representation of the earth’s gravity field. This representation is implied by the potential coeffcients determined by using elements/parameters of the field observed on the surface of the earth and/or in space outside the earth in the spherical harmonic expansion of the field. International Centre for Gravity Earth Models (ICGEM) publishes, from time to time, Global Gravity Field Models (GGMs) that have been developed. These GGMs need evaluation with terrestrial data of different locations to ascertain their accuracy for application in those locations. In this study, Bouguer gravity anomalies derived from a total of eleven (11) recent GGMs, using sixty sample points, were evaluated by means of Root-Mean-Square difference and correlation coeficient. The Root-Mean-Square differences of the computed Bouguer anomalies from ICGEMwebsite compared to their positionally corresponding terrestrial Bouguer anomalies range from 9.530mgal to 37.113mgal. Additionally, the correlation coe_cients of the structure of the signal of the terrestrial and GGM-derived Bouguer anomalies range from 0.480 to 0.879. It was observed that GECO derived Bouguer gravity anomalies have the best signal structure relationship with the terrestrial data than the other ten GGMs. We also discovered that EIGEN-6C4 and GECO derived Bouguer anomalies have enormous potential to be used as supplements to the terrestrial Bouguer anomalies for Enugu State, Nigeria.
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Inzhevatov, Ivan A. "DETERMINATION OF THE VERTICAL GRADIENT OF GRAVITY FROM GRAVITY ANOMALIES." Interexpo GEO-Siberia 6 (May 21, 2021): 116–24. http://dx.doi.org/10.33764/2618-981x-2021-6-116-124.

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In connection with the need to use the vertical gradient in the processing of the results of gravimetric measurements and their interpretation when solving problems of geology, geophysics, geodesy, geodynamics and navigation, in addition to the urgent problems of improvement, socalled indirect methods of measuring the vertical gradient, there is an equally urgent task of developing methods for determining the vertical gradient of gravity, using dependencies between different physical fields. The article presents the development and study of a method for determining the vertical gradient from gravity anomalies using the relationship between gravity anomalies and altitude based on field data obtained in the area of the Tashtagol field on Mount Boulanger in 2019 and 2020.
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Foroughi, Ismael, Abdolreza Safari, Pavel Novák, and Marcelo Santos. "Application of Radial Basis Functions for Height Datum Unification." Geosciences 8, no. 10 (October 2, 2018): 369. http://dx.doi.org/10.3390/geosciences8100369.

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Local gravity field modelling demands high-quality gravity data as well as an appropriate mathematical model. Particularly in coastal areas, there may be different types of gravity observations available, for instance, terrestrial, aerial, marine gravity, and satellite altimetry data. Thus, it is important to develop a proper tool to merge the different data types for local gravity field modelling and determination of the geoid. In this study, radial basis functions, as a commonly useful tool for gravity data integration, are employed to model the gravity potential field of the southern part of Iran using terrestrial gravity anomalies, gravity anomalies derived from re-tracked satellite altimetry, marine gravity anomalies, and gravity anomalies synthesized from an Earth gravity model. Reference GNSS/levelling (geometric) geoidal heights are used to evaluate the accuracy of the estimated local gravity field model. The gravimetric geoidal heights are in acceptable agreement with the geometric ones in terms of the standard deviation and the mean value which are 4.1 and 12 cm, respectively. Besides, the reference benchmark of the national first-order levelling network of Iran is located in the study area. The derived gravity model was used to compute the gravity potential difference at this point and then transformed into a height difference which results in the value of the shift of this benchmark with respect to the geoid. The estimated shift shows a good agreement with previously published studies.
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Ganagina, I. G., V. F. Kanushin, D. N. Goldobin, and I. V. Zverev. "Analysis of data on pure and mixed gravity anomalies obtained from the results of the space gravity missions GRACE, GOCE." Interexpo GEO-Siberia 1 (May 18, 2022): 130–37. http://dx.doi.org/10.33764/2618-981x-2022-1-130-137.

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The article analyzes the data of pure and mixed gravity anomalies on the territory of the Novosibirsk region, obtained from the results of the space gravimetric missions GRACE, GOCE. Gravimetric and geodetic measurements carried out in the study area made it possible to obtain mixed and simulate pure gravity anomalies. The information obtained was the starting point for the analysis of gravity anomalies calculated from the coefficients of the global geopotential models XGM2019e_2159, GOCO01S. The results of the study led to the conclusion that when calculating mixed gravity anomalies according to the combined geopotential model XGM2019e_2159 and pure gravity anomalies according to the GOCO01S satellite model data, equal root-mean-square errors were obtained (for mixed anomalies - 3.45 mGal, for pure - 3.44 mGal). Therefore, modern combined global gravity field models can be used to obtain pure anomalies on the earth's surface.
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Wan, Xiaoyun, Shuanggen Jin, Bo Liu, Song Tian, Weiya Kong, and Richard Fiifi Annan. "Effects of Interferometric Radar Altimeter Errors on Marine Gravity Field Inversion." Sensors 20, no. 9 (April 27, 2020): 2465. http://dx.doi.org/10.3390/s20092465.

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The traditional altimetry satellite, which is based on pulse-limited radar altimeter, only measures ocean surface heights along tracks; hence, leads to poorer accuracy in the east component of the vertical deflections compared to the north component, which in turn limits the final accuracy of the marine gravity field inversion. Wide-swath altimetry using radar interferometry can measure ocean surface heights in two dimensions and, thus, can be used to compute vertical deflections in an arbitrary direction with the same accuracy. This paper aims to investigate the impact of Interferometric Radar Altimeter (InRA) errors on gravity field inversion. The error propagation between gravity anomalies and InRA measurements is analyzed, and formulas of their relationship are given. By giving a group of possible InRA parameters, numerical simulations are conducted to analyze the accuracy of gravity anomaly inversion. The results show that the accuracy of the gravity anomalies is mainly influenced by the phase errors of InRA; and the errors of gravity anomalies have a linear approximation relationship with the phase errors. The results also show that the east component of the vertical deflections has almost the same accuracy as the north component.
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Singh, Bijendra. "Simultaneous computation of gravity and magnetic anomalies resulting from a 2‐D object." GEOPHYSICS 67, no. 3 (May 2002): 801–6. http://dx.doi.org/10.1190/1.1484524.

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This paper presents a new algorithm for the simultaneous computation of gravity and magnetic anomalies resulting from an infinitely long (2‐D) body with an arbitrary polygonal cross‐section. With the assumption of uniform volume density and magnetization, the gravity or magnetic field may be expressed as the field resulting from an equivalent distribution of surface mass density or surface pole density, respectively, over the surface of the source body. The resulting surface integrals are reduced to new line integrals using Stokes' theorem. The components of the fields for each bounding surface are expressed in terms of a new line integral and the solid angle subtended by the surface at the point of observation. Since these analytical solutions are similar in form, a direct relation is derived between gravity and magnetic fields, which allows their simultaneous computation. Hence, the same computer program can be used to compute the gravity field, the magnetic field, or both fields simultaneously. This new approach will find wide applications in the joint inversion of potential field data, as it will make the numerical computations much faster.
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REBOUÇAS, M. J., and A. F. F. TEIXEIRA. "CAUSAL ANOMALIES IN KALUZA–KLEIN GRAVITY THEORIES." International Journal of Modern Physics A 13, no. 18 (July 20, 1998): 3181–91. http://dx.doi.org/10.1142/s0217751x98001578.

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Causal anomalies in two Kaluza–Klein gravity theories are examined, particularly as to whether these theories permit solutions in which the causality principle is violated. It is found that similarly to general relativity the field equations of the space–time–mass Kaluza–Klein (STM-KK) gravity theory do not exclude violation of causality of Gödel type, whereas the induced matter Kaluza–Klein (IM-KK) gravity rules out noncausal Gödel-type models. The induced matter version of general relativity is shown to be an efficient therapy for causal anomalies that occurs in a wide class of noncausal geometries. Perfect fluid and dust Gödel-type solutions of the STM-KK field equations are studied. It is shown that every Gödel-type perfect fluid solution is isometric to the unique dust solution of the STM-KK field equations. The question as to whether 5D Gödel-type noncausal geometries induce any physically acceptable 4D energy–momentum tensor is also addressed.
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Piskarev, Alexey L., and Mikhail Yu Tchernyshev. "Magnetic and gravity anomaly patterns related to hydrocarbon fields in northern West Siberia." GEOPHYSICS 62, no. 3 (May 1997): 831–41. http://dx.doi.org/10.1190/1.1444192.

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A study of the features of gravity and magnetic fields in the vicinity of oil and gas reservoirs in West Siberia demonstrated a spatial relationship with the hydrocarbon deposits. The relevant magnetic and gravity anomalies cover approximately [Formula: see text] in northern West Siberia. Amplitude and frequency were investigated initially using double Fourier spectrum (DFS) analysis. This was followed by (1) application of transformations, filtering, and “moving windows” analysis; (2) compilation of maps of regional and local anomalies, and potential field derivatives; and (3) investigation of the distribution of parameters in areas of known deposits. Hydrocarbon deposits are located mostly at the slopes of positive regional gravity and magnetic anomalies which are interpreted as relating to deep riftogenic structures. At the same time, it is established that the location of hydrocarbon depositions coincides commonly with local gravity and magnetic minima generated by lows in basement density and magnetization. All known hydrocarbon deposits in northern West Siberia are in areas characterized by comparatively high gradients of constituent of gravity anomalies with a wavelength of about 90–100 km. These newly revealed links between reservoirs and potential field parameters may be a means to predict new discoveries in poorly explored territories and seas, primarily in Russia's Arctic shelf.
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Cilek, Mehmet Bora. "Redefining Gravity: Field versus Flow." Applied Physics Research 9, no. 2 (April 1, 2017): 87. http://dx.doi.org/10.5539/apr.v9n2p87.

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General Theory of Relativity constitutes the framework for our understanding of the universe, with an emphasis on gravity. Many of Einstein’s predictions have been verified experimentally but General and Special Theories of Relativity contain several anomalies and paradoxes, yet to be answered. Also, there are serious conflicts with Quantum Mechanics; gravity being the weakest and least understood force, is a major problem.Supported by clear experimental evidence, it is theorised that gravity is not a field or spacetime curvature effect, but rather has a flow mechanism. This is not an alternative theory of gravity with an alternative metric. Established laws and equations from Newton and Einstein are essentially left unchanged. However, spacetime curvature is replaced with flow, producing a refined and compatible theory.
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Shtogryn, M. V., S. G. Anikeyev, and O. O. Synytska. "COMPLEX GEOPHYSICAL STUDIES OF THE IVANO-FRANKIVSK NATIONAL TECHNICAL UNIVERSITY OF OIL AND GAS TERRITORY." Oil and Gas Power Engineering, no. 1(31) (June 26, 2019): 7–17. http://dx.doi.org/10.31471/1993-9868-2019-1(31)-7-17.

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The results of high-precision integrated geophysical studies of the Ivano-Frankivsk National University territory are presented. Research methods used are electrical prospecting and gravity and magnetic prospecting. According to the results of geodetic measurements and field geophysical observations, heights maps of the territory, regional components and detailed maps of local anomalies of the gravitational and magnetic fields, and also, according to the data of vertical electrical sounding, geoelectric sections along interpretation profiles were constructed. For the construction data on the geological and tectonic structure of the section to the depths of the first hundred meters were used, as well as geophysical materials obtained in previous years through of the Ivano-Frankivsk city territory. The analysis of the general behavior of the regional components of the gravimagnetic fields and morphology of geophysical anomalies was performed. The geological interpretation of the identified individual local gravitational and magnetic anomalies is presented. A regional field of gravity tends to increase in the direction of increasing heights in the study area and the regional magnetic field has an insignificant, but inverse relationship. A series of positive small intensity local anomalies of the field of gravity is probably due to the rocks of the Kosovska and Tyraska suite, for example, compacted carbonates or anhydrites. Local magnetic anomalies have a relatively small intensity ranging from -100 nTl to 500 nTl and due mainly to university facilities and communications. According to the results of the analysis of the intensity of geophysical fields, a general forecast estimate of the ecological state of the research area is presented. The obtained field intensity values are much lower than the sanitary norms.
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Dissertations / Theses on the topic "Gravity field anomalies"

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Van, Gysen Hermanus Gerhardus. "Splines and local approximation of the earth's gravity field." Doctoral thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/15821.

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Bibliography: pages 214-220.
The Hilbert space spline theory of Delvos and Schempp, and the reproducing kernel theory of L. Schwartz, provide the conceptual foundation and the construction procedure for rotation-invariant splines on Euclidean spaces, splines on the circle, and splines on the sphere and harmonic outside the sphere. Spherical splines and surface splines such as multi-conic functions, Hardy's multiquadric functions, pseudo-cubic splines, and thin-plate splines, are shown to be largely as effective as least squares collocation in representing geoid heights or gravity anomalies. A pseudo-cubic spline geoid for southern Africa is given, interpolating Doppler-derived geoid heights and astro-geodetic deflections of the vertical. Quadrature rules are derived for the thin-plate spline approximation (over a circular disk, and to a planar approximation) of Stokes's formula, the formulae of Vening Meinesz, and the L₁ vertical gradient operator in the analytical continuation series solution of Molodensky's problem.
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Telmat, Hamid. "Crustal structure and gravity field anomalies in Eastern Canada." Thèse, Chicoutimi : Montréal : Université du Québec à Chicoutimi ; Université du Québec à Montréal, 1998. http://theses.uqac.ca.

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Holt, Robert Andrew. "The gravity field of Sundaland : acquisition, assessment and interpretation." Thesis, University College London (University of London), 1998. http://discovery.ucl.ac.uk/1317811/.

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The 1995 Sandwell & Smith WGI7.2 satellite gravity map has been compared with high quality ship gravity data offshore Sabah. The standard deviation of the differences between gravity profiles interpolated from WGI7.2 and the ship survey was 5.7 mGal. Spectral analysis indicated that WGI7.2 resolves features with half-wavelengths greater than 10 km. Three hundred new gravity stations, including ten base stations tied to IGSN71, were established during a survey of Sabah and were merged with two previous surveys to complete the gravity coverage of the state at reconnaissance level. New gravity maps of Sundaland, compiled from the Sabah and WGI7.2 gravity data sets have been interpreted. ' Subtraction from these data sets of the long wavelength GEM-T3 gravity anomaly field, which is dominated by the effects of the subducted proto-South China Sea and the ongoing subduction of the Australian, Indian and Philippine Sea Plates, achieved a simple 'regional-residual' separation and the isolation of crustal-scale anomalies. 5' x 5' maps of the depth to Moho, crustal thickness and β (crustal extension) factor beneath the Sunda Shelf and the South China Sea have been produced by 1-D geometric manipulation of the marine gravity field using sediment isopach and bathymetry control data. The average difference between the new Moho map and seismic refraction depth-to-Moho estimates at the south China margin was 0.2 ± 2.0 km. The Moho rises from an average depth of 29 km beneath the Sunda Shelf to a depth of about 16 km beneath the South China Sea oceanic basin. It is estimated that approximately 1100 km of oceanic crust of the proto-South China Sea was subducted at the northwest Borneo margin. Gravity modelling independently confirmed the average 35 mm/yr spreading rate prediction for the southwestern subbasin of the South China Sea oceanic basin from magnetic lineation interpretation. Quantitative interpretation indicates that Sabah is underlain by thick continental crust, and gravity modelling of the Maliau Basin predicts a minimum sediment thickness of 8 km. The ophiolite bodies at Telupid and Darvel Bay are separated by a gravity low and there is no evidence that the two are related. The crustal root of the Crocker Ranges extends to a depth of ~49 km below sea level. In order to reach this present day crustal thickness, the turbiditic sediments forming the Crocker Ranges must have been compressed to less than half of their original lateral extent during the Sabah Orogeny.
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Hernandez, Orlando. "Tectonic analysis of northwestern South America from integrated satellite, airborne and surface potential field anomalies." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1158512351.

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Huang, Yichao. "Chaos multiplicatif gaussien et applications à la gravité quantique de Liouville." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066623/document.

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Dans cette thèse, nous nous intéressons par des approches probabilistes à la gravité quantique de Liouville, introduite par Polyakov en 1981 sous la forme d'une intégrale de chemin sur les surfaces 2d. Pour définir cette intégrale de chemin avec interaction exponentielle, nous partons du chaos multiplicatif Gaussien, l'outil fondamental pour définir l'exponentielle des champs Gaussiens de corrélation logarithmique. Dans un premier temps, nous généralisons la construction de la gravité quantique de Liouville sur la sphère de Riemann à une autre géométrie avec bord, celle du disque unité. La nouveauté de ce travail réalisé en collaboration avec R.Rhodes et V.Vargas, est d'analyser avec soin le terme du bord dans l'intégrale de chemin ainsi que l'interaction entre la mesure du bord et la mesure du disque. Nous établissons rigoureusement les formules de la théorie conforme des champs en physique, telles que la covariance conforme, la formule KPZ, l'anomalie de Weyl ainsi que la borne de Seiberg. Une borne de Seiberg relaxée dans le cas de la gravité de Liouville à volume total fixé sur le disque est aussi formulée et étudiée. Dans la seconde moitié de cette thèse, nous comparons cette construction à la Polyakov avec une autre approche de la gravité quantique de Liouville. En collaboration avec deux autres jeunes chercheurs J.Aru et X.Sun, nous fournissons une correspondance entre ces deux approches dans un cas simple et important, celui de la sphère de Riemann avec trois points marqués. En mélangeant les techniques de ces deux approches, nous fournissons une nouvelle procédure d'approximation qui permet de relier ces deux différentes approches
In this thesis, we study the theory of Liouville Quantum Gravity via probabilist approach, introduced in the seminal paper of Polyakov in 1981, using path integral formalism on 2d surfaces. To define this path integral with exponential interaction, we started from the theory of Gaussian Multiplicative Chaos in order to define exponential of log-correlated Gaussian fields. In the first part, we generalise the construction of Liouville Quantum Gravity on the Riemann sphere to another geometry, the one of the unit disk. The novelty of this work, in collaboration with R.Rhodes and V.Vargas, is to analyse carefully the boundary term in the path integral formalism and its interaction with the bulk measure. We establish rigorously formulae from Conformal Field Theory in Physics, such as conformal covariance, KPZ relation, conformal anomaly and Seiberg bounds. A relaxed Seiberg bound in the unit volume case of Liouville Quantum Gravity on the disk is also announced and studied. In the second part of this thesis, we compare this construction in the spirit of Polyakov to another approach to the Liouville Quantum Gravity. In collaboration with two other young researchers, J.Aru and X.Sun, we give a correspondance between these two approaches in a simple but conceptually important case, namely the one on the Riemann sphere with three marked points. Using technics coming from these two approches, we give a new way of regularisation procedure that eventually allow us to link these two pictures
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Pereira, Dante Donizeti. "Abordagem efetiva em teorias de campos: aspectos clássicos e quânticos." Universidade Federal de Juiz de Fora (UFJF), 2013. https://repositorio.ufjf.br/jspui/handle/ufjf/4892.

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Nesta tese exploramos diferentes aspectos de teorias clássicas e quânticas de campos. Na parte clássica, examinamos o fenômeno da birrefringência eletro-magneto-óptica em ele-trodinâmica não-linear no contexto de meios materiais dielétricos não-lineares como uma correção efetiva à teoria linear maxwelliana do eletromagnetismo. Na parte quântica, seguindo o método do heat kernel em teoria quântica de campos sobre espaços curvos, derivamos e estudamos a estrutura das divergências a 1-loop para a ação efetiva de diferentes modelos. Em particular, no ramo do modelo de Yukawa, exibimos duas novas formas de ambiguidades as quais tomam lugar na ação efetiva de campos fermiônicos através do fenômeno da anomalia multiplicativa não-local. Além disso, analisamos a estrutura das divergências ultravioletas a 1-loop para um modelo recentemente proposto de gravitação massiva livre de fantasmas, e mostramos que esse modelo encontra sérias dificuldades no nível quântico.
In this thesis we explore different aspects in classical and quantum field theories. In the classical part, we examine the phenomenon of electro-magneto-optical birefringence in nonlinear electrodynamics in the context of nonlinear dielectric media as an effective correction to the linear Maxwellian theory of electromagnetism. In the quantum part, following the heat kernel method in quantum field theory on curved spaces, we derive and study the structure of the 1-loop divergences for the effective action of different models. In particular, through the Yukawa model, we show two new forms of ambiguities which take place in the effective action of fermionic fields through the phenomenon of nonlocal multiplicative anomaly. Moreover, we analyzed the structure of ultraviolet divergences at 1-loop for a recently proposed ghost-free massive gravity model, and we show that this model meets serious difficulties at the quantum level.
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Wiseman, Ronald. "Potential field modelling and interpretation along the Lithoprobe East onshore seismic reflection transects across the Newfoundland Appalachians /." 1994. http://collections.mun.ca/u?/theses,41270.

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Books on the topic "Gravity field anomalies"

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Bowin, Carl. Gravity anomaly map of Mars and moon and analysis of Venus gravity field: New analysis procedures. Woods Hole, MA: Woods Hole Oceanographic Institution, 1985.

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Fukuda, Yoichi. Precise determination of local gravity field using both the satellite altimeter data and the surface gravity data. Tokyo: Ocean Research Institute, University of Tokyo, 1990.

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Heigold, Paul C. A gravity survey of Marine Field: Case study for Silurian reef exploration. Champaign, Ill: Illinois State Geological Survey, 1989.

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Luxembourg) AROPA Workshop (2001 Münsbach. Proceedings of the Workshop:Analytical Representation of Potential Field Anomalies for Europe (AROPA): October 23th to 27th, 2001, Münsbach-Castle, Münsbach, Grand-Duchy of Luxembourg. Luxembourg: Centre Européen de Géodynamique et de Séismologie, 2003.

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International, Conference on Renormalization Group and Anomalies in Gravity and Cosmology (2003 Ouro Preto Minas Gerais Brazil). Renormalization group and anomalies in gravity and Cosmology: Proceedings of the International Conference on Renormalization Group and Anomalies in Gravity and Cosmology : Ouro Preto, Minas Gerais, Brazil, 17-23 March 2003. [Amsterdam, The Netherlands]: Elsevier, 2004.

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Rapp, Richard H. Artifacts introduced in the point evaluation of functions expanded into a degree 360 spherical harmonic series. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1999.

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Rapp, Richard H. Artifacts introduced in the point evaluation of functions expanded into a degree 360 spherical harmonic series. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1999.

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Rapp, Richard H. Artifacts introduced in the point evaluation of functions expanded into a degree 360 spherical harmonic series. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1999.

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Saudi Arabia. Deputy Ministry for Mineral Resources. and Geological Survey (U.S.), eds. The isostatic gravity anomaly field of southwestern Saudi Arabia and its interpretation. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1985.

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Saudi Arabia. Deputy Ministry for Mineral Resources. and Geological Survey (U.S.), eds. The isostatic gravity anomaly field of southwestern Saudi Arabia and its interpretation. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1985.

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Book chapters on the topic "Gravity field anomalies"

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Mueller, Ivan I. "External Gravity Field of the Earth." In Gravity Anomalies: Unsurveyed Areas, 115–20. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm009p0115.

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Caputo, Michele. "Review of Formulas for the Space Normal Gravity Field Of The Earth." In Gravity Anomalies: Unsurveyed Areas, 121–26. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm009p0121.

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Moritz, Helmut. "The Computation of the External Gravity Field and The Geodetic Boundary-Value Problem." In Gravity Anomalies: Unsurveyed Areas, 127–36. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm009p0127.

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Tenzer, R., A. Ellmann, P. Novák, and P. Vajda. "The Earth’s Gravity Field Components of the Differences Between Gravity Disturbances and Gravity Anomalies." In International Association of Geodesy Symposia, 155–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85426-5_18.

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Alhassan, Ahmad, and Auwal Aliyu. "The Principle of Interpretation of Gravity Data Using Second Vertical Derivative Method." In Gravitational Field - Concepts and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.100443.

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This chapter is aimed at demonstrating how the second vertical derivative method is been applied to gravity data for subsurface delineation. Satellite gravity data of some part of Northern Nigeria that lie between latitude 11°–13°E and longitude 8°–14°N obtained from Bureau Gravimetrique International (BGI) were used for demonstration. The Bouguer graph was plotted using surfer software. The second vertical derivative graph was also plotted. Very low gravity anomalies are observed on the Bouguer map, which recommends the presence of sedimentary rocks which have low density. The result of the second vertical derivative method has improved weaker local anomalies, defined the edges of geologically anomalous density distributions, and identified geologic units. This is a clear implication that the second vertical derivative is very important in subsurface delineation.
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Fattah, Abdel. "New Semi-Inversion Method of Bouguer Gravity Anomalies Separation." In Gravitational Field [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101593.

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The workers and researchers in the field of gravity exploration methods, always dream that it is possible one day, to be able to separate completely the Bouguer gravity anomalies and trace rock’ formations, and their densities distribution from a prior known control points (borehole) to any extended distance in the direction of the profile lines-it seems that day become will soon a tangible true! and it becomes possible for gravity interpretation methods to mimic to some extent the 2D seismic interpretation methods. Where, the present chapter is dealing a newly 2D semi-inversion, fast, and easily applicable gravitational technique, based on Bouguer gravity anomaly data. It now becomes possible through, Excel software, Matlab’s code, and a simple algorithm; separating the Bouguer anomaly into its corresponding rock’ formations causative sources, as well as, estimating and tracing its thicknesses (or depths) of sedimentary formations relative to the underlying basement’s structure rocks for any sedimentary basin, through using of profile(s) line(s) and previously known control points. The newly proposed method has been assessed, examine, and applied for two field cases, Abu Roash Dome Area, southwest Cairo, Egypt, and Humble Salt Dome, USA. The method has demonstrated to some extent comparable results with prior known information, for drilled boreholes.
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Klokočník, Jaroslav, Aleš Bezděk, and Jan Kostelecký. "Gravity field aspects for identification of cosmic impact structures on Earth." In In the Footsteps of Warren B. Hamilton: New Ideas in Earth Science. Geological Society of America, 2022. http://dx.doi.org/10.1130/2021.2553(21).

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ABSTRACT We studied the following proven as well as hypothetical impact craters (among others), and some of the relevant results are reviewed in this chapter: (1) a hypothetical impact structure in Saginaw Bay, Great Lakes, Michigan; (2) a putative impact crater basin under the ice of Antarctica in Wilkes Land; (3) two recently discovered subglacial impact craters in Greenland; (4) a possible huge impact crater in Kotuykanskaya in a remote area of Siberia near the proven impact crater Popigai; and (5) a hypothetical impact object Burckle on the bottom of the Indian Ocean. They were tested using the gravity data derived from the recent gravity field model EIGEN 6C4 (with ground resolution of ~9 km). Our method is novel; we introduce gravity aspects (descriptors) to augment traditional gravity anomalies. The following gravity aspects were used: (a) gravity disturbances/anomalies, (b) second derivatives of the disturbing potential (the Marussi tensor), (c) two of three gravity invariants, (d) their specific ratio (known as 2D factor), (e) strike angles, and (f) virtual deformations. These gravity aspects are sensitive in various ways to the underground density contrasts. They describe the underground structures (not only the craters) more carefully and in more detail than the traditional gravity anomalies could do alone. Our results support geological evidence of the impact craters found by others in many cases or suggest new impact places for further study.
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Carruthers, Richard M., and John D. Cornwell. "Gravity and Magnetic Methods." In Continental Shelf Limits. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195117820.003.0018.

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Lateral variations in the density and magnetization of the rocks within the crust give rise to "anomalies" in the Earth's gravity and magnetic fields. These anomalies can be measured and interpreted in terms of the geology both in a qualitative sense, by mapping out trends and changes in anomaly style, and quantitatively, by creating models of the subsurface which reproduce the observed fields. Such interpretations are generally less definitive in themselves than the results from seismic surveys (see chapter 12), but the data are widely available and can provide information in areas where other methods are ineffective or have not been applied. As the different geophysical techniques respond to specific rock properties such as density, magnetization, and acoustic velocity, the results are complementary, and a fully integrated approach to data collection and interpretation is generally more effective than the sum of its parts assessed on an individual basis. Gravity and magnetic data have been acquired, at least to a reconnaissance scale, over most of the world. In particular, the release into the public domain of satellite altimetry information (combined with improved methods of data processing) means that there is gravity coverage to a similar standard for most of the offshore region to within about 50 km of the coast. Magnetic anomalies recorded from satellites provide global coverage, but the high altitude of the observations means that only large-scale features extending over many 10s of kilometers are delineated. Reconnaissance aeromagnetic surveys with flight lines 10-20 km apart provide a lateral anomaly resolution similar to that of the satellite gravity data. Oceanographic surveys undertaken by a variety of academic and research institutions are another valuable source of data in remote regions offshore which supplement and extend the more detailed coverage obtained over the continental shelves, for example, by oil companies in areas of hydrocarbon interest. Surveys over land vary widely in terms of acquisition parameters and quality, but some form of national compilation is available from many countries. A number of possible applications of the potential field (i.e., gravity and magnetic) data follow from the terms set out by UNCLOS. Paragraph 4(b) of article 76 states, "In the absence of evidence to the contrary, the foot of the continental slope is to be determined as the point of maximum change in the gradient at its base" (italics added).
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Abd-Elmotaal, Hussein A., Norbert Kühtreiber, Kurt Seitz, and Bernhard Heck. "A Precise Geoid Model for Africa: AFRgeo2019." In International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/1345_2020_122.

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Abstract In the framework of the IAG African Geoid Project, an attempt towards a precise geoid model for Africa is presented in this investigation. The available gravity data set suffers from significantly large data gaps. These data gaps are filled using the EIGEN-6C4 model on a 15′× 15′ grid prior to the gravity reduction scheme. The window remove-restore technique (Abd-Elmotaal and Kühtreiber, Phys Chem Earth Pt A 24(1):53–59, 1999; J Geod 77(1–2):77–85, 2003) has been used to generate reduced anomalies having a minimum variance to minimize the interpolation errors, especially at the large data gaps. The EIGEN-6C4 global model, complete to degree and order 2190, has served as the reference model. The reduced anomalies are gridded on a 5′× 5′ grid employing an un-equal weight least-squares prediction technique. The reduced gravity anomalies are then used to compute their contribution to the geoid undulation employing Stokes’ integral with Meissl (Preparation for the numerical evaluation of second order Molodensky-type formulas. Ohio State University, Department of Geodetic Science and Surveying, Rep 163, 1971) modified kernel for better combination of the different wavelengths of the earth’s gravity field. Finally the restore step within the window remove-restore technique took place generating the full gravimetric geoid. In the last step, the computed geoid is fitted to the DIR_R5 GOCE satellite-only model by applying an offset and two tilt parameters. The DIR_R5 model is used because it turned out that it represents the best available global geopotential model approximating the African gravity field. A comparison between the geoid computed within the current investigation and the existing former geoid model AGP2003 (Merry et al., A window on the future of geodesy. International Association of Geodesy Symposia, vol 128, pp 374–379, 2005) for Africa has been carried out.
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Lowrie, William. "5. Gravity and the figure of the Earth." In Geophysics: A Very Short Introduction, 69–91. Oxford University Press, 2018. http://dx.doi.org/10.1093/actrade/9780198792956.003.0005.

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‘Gravity and the figure of the Earth’ discusses the measurement of gravity and its variation at the Earth’s surface and with depth. Gravity is about 0.5 per cent stronger at the poles than at the equator and it first increases with depth until the core–mantle boundary and then sinks to zero at the Earth’s centre. Using satellites to carry out geodetic and gravimetric observations has revolutionized geodesy, creating a powerful geophysical tool for observing and measuring dynamic processes on the Earth. The various measurement techniques employed fall in two categories: precise location of a position on the Earth (such as GPS) and accurate determination of the geoid and gravitational field. Bouguer and free-air gravity anomalies and isostasy are explained.
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Conference papers on the topic "Gravity field anomalies"

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Keller, G. Randy, and Donald Adams. "Gravity and magneitc anomalies in the San Juan Basin area." In 43rd Annual Fall Field Conference. New Mexico Geological Society, 1992. http://dx.doi.org/10.56577/ffc-43.133.

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Lizzi, Fedele, Alexander Andrianov, and Maximilian Kurkov. "Spectral Action from Anomalies." In Corfu Summer Institute on Elementary Particles and Physics - Workshop on Non Commutative Field Theory and Gravity. Trieste, Italy: Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.127.0024.

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Li, Xiong, and Carlos Cevallos. "Curvature of the equipotential surface, gravity potential, field and gradient anomalies." In SEG Technical Program Expanded Abstracts 2013. Society of Exploration Geophysicists, 2013. http://dx.doi.org/10.1190/segam2013-0379.1.

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Puškorius, Vytautas, Eimuntas Paršeliūnas, Petras Petroškevičius, and Romuald Obuchovski. "An Analysis of Choosing Gravity Anomalies for Solving Problems in Geodesy, Geophysics and Environmental Engineering." In 11th International Conference “Environmental Engineering”. VGTU Technika, 2020. http://dx.doi.org/10.3846/enviro.2020.684.

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Gravity anomalies provide valuable information about the Earth‘s gravity field. They are used for solving various geophysical and geodetic tasks, mineral and oil exploration, geoid and quasi-geoid determination, geodynamic processes of Earth, determination of the orbits of various objects, moving in space around the Earth etc. The increasing accuracy of solving the above mentioned problems poses new requirements for the accuracy of the gravity anomalies. Increasing the accuracy of gravity anomalies can be achieved by gaining the accuracy of the gravimetric and geodetic measurements, and by improving the methodology of the anomalies detection. The modern gravimetric devices allow to measure the gravity with an accuracy of several microgals. Space geodetic systems allow to define the geodetic coordinates and ellipsoidal heights of gravimetric points within a centimeter accuracy. This opens up the new opportunities to calculate in practice both hybrid and pure gravity anomalies and to improve their accuracy. In this context, it is important to analyse the possibilities of detecting various gravity anomalies and to improve the methodology for detecting gravity anomalies. Also it is important the correct selection of the gravity anomalies for different geodetic, geophysical and environmental engineering tasks. The modern gravity field data of the territory of Lithuania are used for the research.
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Petroškevicius, Petras, Romuald Obuchovski, Rosita Birvydienė, Ricardas Kolosovskis, Raimundas Putrimas, Boleslovas Krikštaponis, Dovydas Macijauskas, et al. "New Research on Gravity Field in Lithuanian Territory." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.225.

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New research of Lithuanian territory gravity field was started in 2016 with aim to improve accuracy of quasigeoid as well as accuracy of normal heights determined by methods of satellite geodesy. Obtained data could be used in the research of geophysics, geodynamics as well as in performing the precise navigation. Quartz automatic gravimeters Scintrex CG-5 are planned to be used for the survey consisting of 30000 points. Method of gravity measurements was worked out. RMS error of gravity determined with this method does not exceed 60 @Gal. Coordinates and heights of measured points are determined with GNSS using LitPOS network and LIT15G quasigeoid model. RMS error of coordinate determination does not exceed 0,20 m, for normal heights – 0,15 m. Method of gravity anomalies determination and their accuracy estimation was prepared.
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Meng, Qingwu, Jianguang Qu, Xiuhai Li, Weicheng Zhang, Xianglai Meng, and Hongwen Zhang. "Compensating method of the height anomalies for ultra-high Earth's gravity field model." In 4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icreet-16.2017.74.

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Eshagh Zadeh, A., V. E. Ardestany, and H. Tabatabaee. "Optimization of Gravity Anomalies Due to Folded Structures of an Oil Field with Parabolic Density Contrast." In 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011. Netherlands: EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20149653.

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Mielke, Eckehard W. "Anomalies and gravity." In PARTICLES AND FIELDS: X Mexican Workshop on Particles and Fields. AIP, 2006. http://dx.doi.org/10.1063/1.2359409.

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Kherani, E. Alam, Philippe Lognonne, H. Herbert, L. Rolland, and Eurico R. de Paula. "Modeling of the Total Electronic Content and magnetic field anomalies generated by the 2011 Tohoku-oki tsunami and associated acoustic-gravity waves." In 13th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 26-29 August 2013. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2013. http://dx.doi.org/10.1190/sbgf2013-387.

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Kadir, Wawan Gunawan A., Susanti Alawiyah, Darharta Dahrin, Djoko Santoso, Setianingsih, Eko Januari Wahyudi, Arness Adabi, and Eko Widianto. "Identification of Fault Structure and Hydrocarbon Prospect Areas based on Integration of Gravity Anomalies, Geology and Production Well Analysis in the ‘X’ Oil Field, East Kalimantan." In Proceedings of the 11th SEGJ International Symposium, Yokohama, Japan, 18-21 November 2013. Society of Exploration Geophysicists, 2013. http://dx.doi.org/10.1190/segj112013-046.

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Reports on the topic "Gravity field anomalies"

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Burns, L. E. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/293.

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Burns, L. E. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island (diazo film version). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/289.

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