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Academic literature on the topic 'Geology Gravity anomalies Magnetic anomalies Geology'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Geology Gravity anomalies Magnetic anomalies Geology"

1

Broome, H. John. "Generation and interpretation of geophysical images with examples from the Rae Province, northwestern Canada shield." GEOPHYSICS 55, no. 8 (August 1990): 977–97. http://dx.doi.org/10.1190/1.1442927.

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Different types of images generated from gravity, magnetic, and gamma ray spectrometry data from the Rae Province of the Canadian shield were compared with each other and geologic maps to evaluate their effectiveness for displaying the geologically relevant content of the data sets. Shading methods were useful for enhancing weak directional anomalies in the aeromagnetic data. Multi‐directional, shaded‐relief images produced by overlaying three colored, shaded‐relief images are useful for analysis of anomalies associated with structure. Vertical gravity derivative images display a continuous gravity feature linking the Wager Bay and Amer Lake shear zones that is obscured on the Bouguer gravity intensity image. Detailed vertical magnetic derivative images of the shear zone clearly displayed anomalies associated with the internal structure. Composite images generated using three different geophysical parameters show correlations between the magnetic, gravity, and radiometric data which can be related to the geology. Subtle variations in uranium, thorium, and potassium concentrations determined by gamma ray spectrometry can be effectively displayed using ternary radioelement images

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Paterson, Norman R., and Colin V. Reeves. "Applications of gravity and magnetic surveys: The state‐of‐the‐art in 1985." GEOPHYSICS 50, no. 12 (December 1985): 2558–94. http://dx.doi.org/10.1190/1.1441884.

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There is a continuous large demand for gravity and magnetic surveys all over the world for a variety of exploration applications, all of which require the geophysicist to provide some new insight into the geology of an area at scales ranging from very large to very small. To achieve this objective, (a) surveys must be carried out accurately, and (b) their results must be interpreted in sympathy with what is already known of the geology. The methodology for acquiring and compiling data appears to be keeping pace with modern technology. Methods of quantitatively interpreting anomalies in terms of models of causative bodies are adapting rapidly to the burgeoning availability of computing power, from large, powerful machines to inexpensive and field‐portable microcomputers. Geologic interpretation, or the identification of physical property distributions in terms of realistic geologic models and processes, is still relatively neglected—in practice and, regretably, in the geophysical literature. Research into the relationships between physical rock properties—particularly magnetite distribution—and geology is gaining momentum, but research still lags behind the requirements of the conscientious geophysical interpreter.

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Cooper, G. R. J. "An improved terracing algorithm for potential-field data." GEOPHYSICS 85, no. 5 (September 1, 2020): G109—G113. http://dx.doi.org/10.1190/geo2019-0129.1.

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Although the boundaries between geologic units with different physical properties are usually quite distinct, the potential-field anomalies associated with them are relatively smooth, particularly for deeper bodies. The terracing filter has been introduced to sharpen anomaly edges and to produce regions of constant amplitude between them, mimicking geologic units on a geologic map. The boundaries between the pseudogeologic units are defined by the zero contour of the Laplacian function. Unfortunately, this can result in the domains of terraced anomalies extending far from the original location of the causative body, producing an image that poorly represents the geology. I have determined that the use of the mathematical shape index of the anomalies, rather than their Laplacian, produces a much more geologically realistic result. The effect can be controlled as desired using a threshold parameter. I evaluate the benefits of the method on gravity and magnetic data from southern Africa.

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Clark, D. A., S. J. Saul, and D. W. Emerson. "Magnetic and gravity anomalies of a triaxial ellipsoid." Exploration Geophysics 17, no. 4 (December 1986): 189–200. http://dx.doi.org/10.1071/eg986189.

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BUSBY, J. P., and N. J. P. SMITH. "The nature of the Variscan basement in southeast England: evidence from integrated potential field modelling." Geological Magazine 138, no. 6 (November 2001): 669–85. http://dx.doi.org/10.1017/s0016756801005751.

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The Variscides of southeast England are buried beneath post-Carboniferous cover. Interpretations of the basement are based mainly on deep boreholes. Geophysical signatures from the basement are contained within the regional gravity and magnetic data. A gravity stripping exercise has been undertaken to remove the gravitational effect of the post-Variscan cover to generate a residual gravity map. This map is interpreted along with integrated potential field modelling along four long interconnected profiles and compared with a revised pre-Permian subcrop map. The magnetic evidence suggests that Precambrian magnetic basement of the Midlands Microcraton has been buried southwards by north-vergent Variscan thusting over the foreland. North of the Variscan Front, short-wavelength anomalies superimposed upon this deep Precambrian source are due to shallower Silurian and Carboniferous volcanic rocks. Many residual gravity lows within the Rhenohercynian zone may be related to thick, low-density Devonian basins. In the English Channel a change in geophysical signature occurs north of the Portland–Wight Fault, coinciding with phyllites in the basement. Models are presented in which the English Channel magnetic anomalies originate within the pre-Permian basement. Comparisons with anomalies in the Southwestern Approaches suggest that the Portland–Wight Thrust is a terrane boundary, possibly a subduction-related suture, implying southerly directed Variscan subduction.

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van Wijk, Jolante W., Samuel P. Heyman, Gary J. Axen, and Patricia Persaud. "Nature of the crust in the northern Gulf of California and Salton Trough." Geosphere 15, no. 5 (August 14, 2019): 1598–616. http://dx.doi.org/10.1130/ges02082.1.

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Abstract In the southern Gulf of California, the generation of new oceanic crust has resulted in linear magnetic anomalies and seafloor bathymetry that are characteristic of active seafloor-spreading systems. In the northern Gulf of California and the onshore (southeastern California, USA) Salton Trough region, a thick sedimentary package overlies the crystalline crust, masking its nature, and linear magnetic anomalies are absent. We use potential-field data and a geotherm analysis to constrain the composition of the crust (oceanic or continental) and develop a conceptual model for rifting. Gravity anomalies in the northern Gulf of California and Salton Trough are best fit with crustal densities that correspond to continental crust, and the fit is not as good if densities representative of mafic rocks, i.e., oceanic crust or mafic underplating, are assumed. Because extensive mafic underplated bodies would produce gravity anomalies that are not in agreement with observed gravity data, we propose, following earlier work, that the anomalies might be due to serpentinized peridotite bodies such as found at magma-poor rifted margins. The density and seismic velocities of such serpentinized peridotite bodies are in agreement with observed gravity and seismic velocities. Our conceptual model for the Salton Trough and northern Gulf of California shows that net crustal thinning here is limited because new crust is formed rapidly from sediment deposition. As a result, continental breakup may be delayed.

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Martinez, Cericia, and Yaoguo Li. "Lithologic characterization using airborne gravity gradient and aeromagnetic data for mineral exploration: A case study in the Quadrilátero Ferrífero, Brazil." Interpretation 3, no. 2 (May 1, 2015): SL1—SL13. http://dx.doi.org/10.1190/int-2014-0195.1.

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We present a study on utilizing airborne gravity gradient and magnetic data to characterize an iron ore formation in Minas Gerais, Brazil. The target iron ore bodies have a distinctly high density contrast and produce well-defined anomalies in airborne gravity gradiometry data. The high-grade hematite iron ores are associated with low and moderate susceptibility, making magnetic data useful in distinguishing potential ore bodies from the host iron formation. The airborne gravity gradient and magnetic data over part of the Gandarela Syncline iron formation in the Quadrilátero Ferrífero are independently inverted to obtain a 3D susceptibility and density contrast model. These detailed 3D physical property distributions of subsurface features are then used for geologic characterization and interpretation purposes through lithologic associations. We outline two approaches to link the two physical property distributions and identify representative geologic units in the study area. The geologic units are then organized into a 3D lithology model to help characterize subsurface geologic structure and ore distribution. The lithologic models provide an intuitive representation of the geology and can assist in future exploration plans or in assessment of resource distribution and quality. Our study demonstrates that such approaches are feasible on the deposit scale.

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Stampolidis, A., G. Tsokas, A. Kiratzi, and S. Pavlides. "Major tectonic structures in northeastern Greece deduced from geophysical and seismological data." Bulletin of the Geological Society of Greece 40, no. 3 (June 5, 2018): 1279. http://dx.doi.org/10.12681/bgsg.16880.

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We apply lineaments analysis on the gravity and magnetic data of NE Greece, and combine seismological and geophysical data in order to delineate the major structural features. These methods are frequently used for extracting the dimensional and physical parameters of the buried structures that stimulate gravity and magnetic fields. These estimates concern the location, local depth, strike, dip and physical quantity contrast, of potential field contacts. We used results from previous studies in order to correct the Bouguer data for the gravity effect of the crust. The isostatic residual gravity anomalies, produced from the subtraction of the effect of the crust, are related to near-surface features. Noise suppression was achieved by slightly upward continuing the data by one cell size. Geologic significance of detected lineaments is confirmed by comparisons with the known geology, active tectonics and seismicity as well as with topographic lineaments

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Gaynanov, A. G., M. B. Leybov, Ton Tik Ai, and A. A. Shreyder. "GRAVITY AND MAGNETIC ANOMALIES OF THE INDIAN OCEAN AND ITS LITHOSPHERIC STRUCTURE." International Geology Review 31, no. 6 (June 1989): 580–89. http://dx.doi.org/10.1080/00206818909465910.

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Lee, M. K., T. C. Pharaoh, J. P. Williamson, C. A. Green, and W. De Vos. "Evidence on the deep structure of the Anglo-Brabant Massif from gravity and magnetic data." Geological Magazine 130, no. 5 (September 1993): 575–82. http://dx.doi.org/10.1017/s0016756800020872.

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AbstractGravity and aeromagnetic data from Britain, Belgium and the southern North Sea have been compiled to provide coverage of the greater part of the Anglo-Brabant Massif. Colour pseudo-relief maps of the gravity and magnetic fields highlight important anomalies and trends which provide new information on the structure of the massif and its margins. Within the massif, prominent SSE-trending geophysical lineaments define the margins of distinctive blocks within the upper crust. These are cross-cut on the northeastern margin of the massif by prominent ESE- and SE-trending magnetic and gravity lineaments. The possible history and origin of the more prominent geophysical anomalies and lineaments are considered. Integrated modelling of the potential field data has been carried out along the BIRPS MOBIL-7 seismic reflection line to provide an interpretation of crustal structure across the northeast margin of the massif constrained by all three datasets. The principal features of the model are a non-reflective, non-magnetic upper crust, interpreted as the Caledonian fold–thrust belt, overlying a heterogeneous middle–lower crust with laterally varying reflectivity, magnetization and density. ESE-trending magnetic anomalies along the northeast edge of the massif are explained in terms of an irregular mid-crustal magnetic layer with a susceptibility comparable to that of the Tubize Group in the Brabant Massif. The top of this body is coincident with prominent dipping mid-crustal reflectors observed on the seismic reflection profile and its overall geometry is compatible with mid-crustal imbrication inferred from the seismic data.

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Dissertations / Theses on the topic "Geology Gravity anomalies Magnetic anomalies Geology"

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Hussein, Musa Jad. "Integrated and comparative geophysical studies of crustal structure of pull-apart basins the Salton Trough and Death Valley, California regions /." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2007. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Chan, Mei-ki. "Gravity and aeromagnetic modelling of the Longmenshan Fold-and-Thrust Belt, SW China." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/b4020330x.

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Chan, Mei-ki, and 陳美琪. "Gravity and aeromagnetic modelling of the Longmenshan Fold-and-Thrust Belt, SW China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B4020330X.

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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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Guo, Bin. "An integrated geophysical investigation of the Tamworth Belt and its bounding faults." Phd thesis, Australia : Macquarie University, 2005. http://hdl.handle.net/1959.14/13240.

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Thesis (PhD)--Macquarie University, Division of Environmental & Life Sciences, Department of Earth and Planetary Sciences, 2005.
Bibliography: leaves 202-224.
Introduction -- Geological setting of the New England Fold Belt -- Regional geophysical investigation -- Data acquisition and reduction -- Modelling and interpretation of magnetic data over the Peel Fault -- Modelling and interpretation of magnetic data over the Mooki Fault -- Gravity modelling of the Tamworth Belt and Gunnedah Basin -- Interpretation and discussion -- Conclusions.
This thesis presents new magnetic and gravity data for the Southern New England Fold Belt (SNEFB) and the Gunnedah Basin that adjoins to the west along the Mooki Fault in New South Wales. The SNEFB consists of the Tamworth Belt and Tablelands Complex that are separated by the Peel Fault. The Tablelands Complex to the east of the Peel Fault represents an accretionary wedge, and the Tamworth Belt to the west corresponds to the forearc basin. A total of five east-north-east trending gravity profiles with around 450 readings were conducted across the Tamworth Belt and Gunnedah Basin. Seven ground magnetic traverses of a total length of 60 km were surveyed across the bounding faults of the Tamworth belt, of which five were across the Peel Fault and two were across the Mooki Fault. The gravity data shows two distinct large positive anomalies, one over the Tamworth Belt, known as the Namoi Gravity High and another within the Gunnedah Basin, known as the Meandarra Gravity Ridge. All gravity profiles show similarity to each other. The magnetic data displays one distinct anomaly associated with the Peel Fault and an anomaly immediately east of the Mooki Fault. These new potential field data are used to better constrain the orientation of the Peel and Mooki Faults as well as the subsurface geometry of the Tamworth Belt and Gunnedah Basin, integrating with the published seismic data, geologic observations and new physical properties data. --Magnetic anomalies produced by the serpentinite associated with the Peel Fault were used to determine the orientation of the Peel fault. Five ground magnetic traverses were modelled to get the subsurface geometry of the serpentinite body. Modelling results of the magnetic anomalies across the Peel Fault indicate that the serpentinite body can be mostly modelled as subvertical to steeply eastward dipping tabular bodies with a minimum depth extent of 1-3 km, although the modelling does not constrain the vertical extent. This is consistent with the modelling of the magnetic traverses extracted from aeromagnetic data. Sensitivity analysis of a tabular magnetic body reveals that a minimum susceptibility of 4000x10⁻⁶cgs is needed to generate the observed high amplitude anomalies of around 2000 nT, which is consistent with the susceptibility measurements of serpentinite samples along the Peel Fault ranging from 2000 to 9000 x 10⁻⁶ cgs. Rock magnetic study indicates that the serpentinite retains a strong remanence at some locations. This remanence is a viscous remanent magnetisation (VRM) which is parallel to the present Earth's magnetic field, and explains the large anomaly amplitude over the Peel fault at these locations. The remanence of serpentinite at other localities is not consistent enough to contribute to the observed magnetic anomalies. A much greater depth extent of the Peel Fault was inferred from gravity models. It is proposed that the serpentinite along the Peel Fault was emplaced as a slice of oceanic floor that has been accreted to the front of the arc, or as diapirs rising off the serpentinised part of the mantle wedge above the supra subduction zone.
Magnetic anomalies immediately east of the Mooki Fault once suggested to be produced by a dyke-like body emplaced along the fault were modelled along two ground magnetic traverses and three extracted aeromagnetic lines. Modelling results indicate that the anomalies can be modelled as an east-dipping overturned western limb of an anticline formed as a result of a fault-propagation fold with a shallow thrust step-up angle from the décollement. Interpretation of aeromagnetic data and modelling of the magnetic traverses indicate that the anomalies along the Mooki Fault are produced by the susceptibility contrast between the high magnetic Late Carboniferous Currabubula Formation and/or Early Permian volcanic rocks of the Tamworth Belt and the less magnetic Late Permian-Triassic Sydney-Gunnedah Basin rocks. Gravity modelling indicates that the Mooki Fault has a shallow dip ( ̃25°) to the east. Modelling of the five gravity profiles shows that the Tamworth Belt is thrust westward over the Sydney-Gunnedah Basin for 15-30 km. --The Meandarra Gravity Ridge within the Gunnedah Basin was modelled as a high density volcanic rock unit with a density contrast of 0.25 tm⁻³, compared to the rocks of the Lachlan Fold Belt in all profiles. The volcanic rock unit has a steep western margin and a gently dipping eastern margin with a thickness ranging from 4.5-6 km, and has been generally agreed to have formed within an extensional basin. --The Tamworth Belt, being mainly the product of volcanism of mafic character and thus has high density units, together with the high density Woolomin Association, which is composed chiefly of chert/jasper, basalt, dolerite and metabasalt, produces the Namoi Gravity High. Gravity modelling results indicate that the anomaly over the Tamworth Belt can be modelled as either a configuration where the Tablelands Complex extends westward underthrusting the Tamworth Belt, or a configuration where the Tablelands Complex has been thrust over the Tamworth Belt. When the gravity profiles were modelled with the first configuration, the Peel Fault with a depth extent of around 1 km can only be modelled for the Manilla and Quirindi profiles, modelling of the rest of the gravity profiles indicates that the Tablelands Complex underthrust beneath the Tamworth belt at a much deeper location.
Mode of access: World Wide Web.
xi, 242 leaves ill., maps

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Ussami, Naomi. "Interpretation of the gravity anomalies of Bahia state Brazil." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/6828/.

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This thesis describes the gravity interpretation of Bahia State, Brazil, which comprises the northern Sao Francisco craton, the Upper Proterozoic fold belts and the basins adjacent to the continental margin. The study centres on the isostatic analysis of the region and on the interpretation of large and high amplitude negative anomalies which occur over the Precambrian and the sedimentary basins. The isostatic analysis of the northern Sao Francisco craton was carried out using the isostatic response function technique. Taking into account subsurface loads, an elastic plate with a minimum effective thickness of 20-40 km explains the observed isostatic response function. The subsurface loads are (l) a slight thickening of the crust under the Espinhaco Fold System and (2) five to ten kilometres of low density rocks in the upper crust. A large and high amplitude ( - 50 mGal ) negative anomaly of shallow origin, centred near the western border of the Paramirim complex and parallel to the Espinhaco fold belt, is interpreted as caused by a large and mainly unexposed granite batholith. The granite substantially underlies the fold belt and extends towards the centre of the Paramirim complex. The minimum density contrast between the granite and the country rocks is estimated to be -0.06 g cm(^-3). The thickness of the granite is 8 to 13 km for density contrasts of -0.15 g cm(^-3) to -0.10 g cm(^-3). A series of high amplitude negative anomalies (50 to 100 rrGal), without flanking positive anomalies, characterizes the onshore Reconcavo, Tucano and Jatoba basins, which were ail formed in connection with the South Atlantic opening. The gravity interpretation indicates up to 7 km of sediments infilling these basins and no significant Mo ho upwarp beneath. In contrast, the gravity anomalies over the offshore Jacuipe and Sergipe-Alagoas basins are explained by a thick accumulation of sediments on a strongly attenuated crust. The onshore basins show short-lived subsidence ( < 25 Ma) with little, if any thermal subsidence. Syn-rift and post-rift (thermal) sedimentation is observed only in the continental margin basins. A mechanism in which upper crustal extension in one region (onshore basins) is compensated and balanced against lower extension in another region (offshore basins), through a detachment fault, may explain the way these basins formed.

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Kim, Hyung Rae. "Antarctic lithospheric anomalies from Ørsted Satellite and near-surface magnetic observations /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486457871784852.

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Wyer, Paul Patrick Andrew. "Gravity anomalies and segmentation of the Eastern USA passive continental margin." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:cefa0dff-a009-4511-a530-c3e3d3b2da1e.

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A compilation of high quality post-rift sediment isopach data has been used in conjunction with the observed free-air gravity anomaly to determine segmentation of the long term mechanical properties of the lithosphere at the Eastern USA passive margin. This segmentation is represented by a process-oriented analysis in which the flexural response of the margin to post-rift sediment loading is controlled by spatial variations in effective elastic thickness (T_e) of the underlying lithosphere. Existing Eastern USA margin T_e estimates range from less than 10km to more than 30km. In this study it is shown that high strengths of 10 - 40km T_e are confined to structural arches dividing the broadest marginal basins, while low strengths of less than 10km T_e are typically found in structural embayments and beneath the deep basins. The hinge zone, across which the degree of continental thinning increases rapidly, marks the transition between high and low strength. Yield strength envelope models support an argument that regions of low strength were created by lithospheric thinning during rifting, and sustained by thermal insulation and flexural curvature associated with voluminous post-rift sediment deposition. Along-strike T_e variations - reflected in the alternation of basement platforms and embayments - are attributed to inheritance of lithospheric segmentation from earlier tectonic events. Along-strike segmentation of the margin has previously been observed as a 300 - 500km wavelength spectral energy peak in the shelf break Airy isostatic gravity anomaly (IGA) high. That this segmentation is explained by variations in the underlying lithospheric strength is demonstrated by a flexural IGA high in which the equivalent spectral peak is absent. The spectral energy of the along-strike T_e distribution peaks in the same waveband. Removal of process-oriented components from the observed free-air gravity anomaly reveals other contributions that were not resolved in earlier studies. In particular, the (previously unknown) Carolina Trough Isostatic Gravity Anomaly, has been identified and attributed to an extrusive (syn-rift) volcanic source. Detailed study of this anomaly suggests that the margin is segmented in terms of its volcanic character, and argues against recent estimates of the volume of new igneous material emplaced during rifting.

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Fagbola, Olamide Olawumi. "Integrated study of basins in the Four Corners Region." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2007. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Jones, Michael Bryan. "Correlative Analysis of the Gravity and Megnetic Anomalies of Ohio and their Geologic Significance." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392823447.

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Books on the topic "Geology Gravity anomalies Magnetic anomalies Geology"

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Hildenbrand, T. G. Magnetic and gravity study of the Paducah 1 x̊ 2 C̊USMAP Quadrangle, Illinois, Indiana, Kentucky, and Missouri. Washington: U.S. G.P.O., 1996.

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Rybakov, Michael. Gravity and magnetic study of the subsurface geology in Mount Carmel and the Yizreʼel Valley. Israel: the Ministry of National Infrastructures, Earth Science Research Administration, 2009.

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Lee, Sang-Mook. Tectonics of the East Pacific rise: Studies of faulting characteristics and magnetic and gravity anomalies. Woods Hole, Mass: Massachusetts Institute of Technology, Woods Hole Oceanographic Institution, Joint Program in Oceanography/Applied Ocean Science and Engineers, 1995.

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Loen, Jeffrey S. Gold placer deposits and a molybdenum anomaly in the Miners Gulch area, Granite County, Montana. [Washington]: U.S. Govt. Print. Off., 1989.

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Ponce, David A. Gravity and magnetic anomalies in the vicinity of Yucca Mountain and their geologic implications. Menlo Park, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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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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Moses, Michael J. Structure of the Bane Dome, Giles County, Virginia: A gravity test. Charlottesville, Va: Commonwealth of Virginia, Dept. of Mines, Minerals, and Energy, Division of Mineral Resources, 1991.

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Stoeser, D. B. The Hijinah uplift and regional gravity sliding in the Wajid sandstone, Kingdom of Saudi Arabia. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1985.

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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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Solomon, Sean C. Inversion of gravity and bathymetry in oceanic regions for long-wavelength variations in upper mantle temperature and composition: Final report to the National Aeronautics and Space Administration on NASA grant NAGW-3036. [Washington, DC]: The Administration, 1993.

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Book chapters on the topic "Geology Gravity anomalies Magnetic anomalies Geology"

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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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Grabowski, Jacek, Leszek Krzemiński, Johann Schnyder, Katarzyna Sobień, Jan Hejnar, Leona Koptiková, Andrzej Pszczółkowski, and Petr Schnabl. "Integrated Magnetic Susceptibility and Geochemical Record of δ13C Anomalies in the Berriasian and Valanginian Sections from the Tethyan Domain (Western Carpathians, Poland)." In Springer Geology, 847–51. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_159.

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Simonenko, Tatiana. "Relation of Magnetic Anomalies to Topography and Geology in the USSR." In The Earth's Crust and Upper Mantle, 415–21. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm013p0415.

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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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Lidiak, E. G., W. J. Hinze, G. R. Keller, J. E. Reed, L. W. Braile, and R. W. Johnson. "22. Geologic Significance of Regional Gravity and Magnetic Anomalies in the East-Central Midcontinent." In The Utility of Regional Gravity and Magnetic Anomaly Maps, 287–307. Society of Exploration Geophysicists, 1985. http://dx.doi.org/10.1190/1.0931830346.ch22.

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Robinson, E. S., P. V. Poland, L. Glover, and J. A. Speer. "24. Some Effects of Regional Metamorphism and Geologic Structure on Magnetic Anomalies over the Carolina Slate Belt near Roxboro, North Carolina." In The Utility of Regional Gravity and Magnetic Anomaly Maps, 320–24. Society of Exploration Geophysicists, 1985. http://dx.doi.org/10.1190/1.0931830346.ch24.

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Khesin, Boris, Shimon Feinstein, and Sophia Itkis. "Possible sources of magnetic anomalies over thermally metamorphosed carbonate rocks of the Mottled Zone in Israel." In Geology of Coal FiresCase Studies from Around the World. Geological Society of America, 2007. http://dx.doi.org/10.1130/2007.4118(11).

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Conference papers on the topic "Geology Gravity anomalies Magnetic anomalies Geology"

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Wang, Jun, Xiao-hong Meng, and Fang Li. "Modelling of geologic bodies with gravity anomalies based on the fast multipole algorithm." In International Workshop and Gravity, Electrical & Magnetic Methods and their Applications, Chenghu, China, 19-22 April 2015. Society of Exploration Geophysicists and and Chinese Geophysical Society, 2015. http://dx.doi.org/10.1190/gem2015-018.

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Guofen, Lian, Niu Jiao, Jiang Lianbin, Zheng Li, and Xiao Bingye. "A New Method to Identify Geologic Anomalies Body by 3D Gravity-Magnetic-Electromagnetic and Seismic Data* – An Example of Conglomerate in DB Area." In Beijing 2014 International Geophysical Conference & Exposition, Beijing, China, 21-24 April 2014. Society of Exploration Geophysicists and Chinese Petroleum Society, 2014. http://dx.doi.org/10.1190/igcbeijing2014-316.

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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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Nair, Manoj, Arnaud Chulliat, Adam Woods, Patrick Alken, Brian Meyer, Benny Poedjono, Nicholas Zachman, and John Hernandez. "Next Generation High-Definition Geomagnetic Model for Wellbore Positioning, Incorporating New Crustal Magnetic Data." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31044-ms.

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Abstract Magnetic wellbore positioning depends on an accurate representation of the Earth's magnetic field,where the borehole azimuth is inferred by comparing the magnetic field measured-whiledrilling (MWD) with a geomagnetic reference model. Therefore, model accuracy improvements reduce the position uncertainties. An improved high-resolution model describing the core, crustal and external components of the magnetic field is presented, and it is validated with anindependent set of measurements. Additionally, we benchmark it against other high-resolution geomagnetic models. The crustal part of the improved high-definition model is based on NOAA/NCEI's latest magnetic survey compilation "EMAG2v3" which includes over 50 millionnew observations in several parts of the world, including the Gulf of Mexico and Antarctica, and does not rely on any prior information from sea-floor geology, unlike earlier versions. The core field part of the model covers years 1900 through 2020 andis inferred from polar-orbiting satellite data as well as ground magnetic observatory data. The external field part is modelled to degree and order 1 for years 2000 through 2020. The new model has internal coefficients to spherical harmonic degree and order 790, resolving magnetic anomalies to approximately 51 km wavelength at the equator. In order to quantitatively assess its accuracy, the model was compared with independent shipborne, airborne and ground magnetic measurements. We find that the newmodel has comparable or smaller errors than the other models benchmarkedagainst it over the regions of comparisons. Additionally, we compare theimproved model against magnetic datacollected from MWD; the residual error lies well within the accepted industry error model, which may lead tofuture error model improvements.

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Reports on the topic "Geology Gravity anomalies Magnetic anomalies Geology"

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Srivastava, S. P., S. Levesque, W. R. Roest, and J. Verhoef. Regional geology and geophysics 6: plate reconstructions, gravity and magnetic anomalies. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/210597.

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