Relevant bibliographies by topics / Gravity anomalies Geophysics Geology

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Academic literature on the topic 'Gravity anomalies Geophysics Geology'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Gravity anomalies Geophysics Geology"

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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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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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Featherstone, William E., Mike Dentith, and Jonathan F. Kirby. "The determination and application of vector gravity anomalies." Exploration Geophysics 31, no. 1-2 (March 2000): 109–13. http://dx.doi.org/10.1071/eg00109.

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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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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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Chakravarthi, V. "Automatic gravity optimization of 2.5D strike listric fault sources with analytically defined fault planes and depth-dependent density." GEOPHYSICS 76, no. 2 (March 2011): I21—I31. http://dx.doi.org/10.1190/1.3541957.

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An automatic gravity inversion technique in the space domain simultaneously estimates the parameters of strike-limited listric fault sources and regional gravity background from a set of observed Bouguer gravity anomalies. The fault profile and regional effect are described by unknown polynomial functions of arbitrary but prescribed degree. Furthermore, the density contrast within the fault structure is presumed to be known, according to a prescribed parameterized nonlinear function of depth, in geologic settings where the detached downthrown block consists of a series of sedimentary beds whose density increases with depth. The inversion is automatic in that it initializes and determines polynomial coefficients for the fault boundary and regional gravity background from a set of observed Bouguer gravity anomalies and improves them iteratively until the modeled gravity anomalies mimic the observed anomalies. An analysis of a set of gravity anomalies attributable to a synthetic model of a listric fault structure in the presence of pseudorandom noise with and without regional background has disclosed that the algorithm yields reliable interpretations with modest error in model geometry, even in the presence of pseudorandom noise. In the presence of regional gravity background and pseudorandom noise, the estimated parameters of the structure deviate marginally from the true ones. The derived density-depth model of the Jharia coal basin in India, a pull-apart basin, has been used to analyze the observed Bouguer gravity anomalies of a boundary fault. The interpretation has yielded information consistent with drilling results and geologic setting of the basin.
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Barrows, Larry, and John D. Fett. "A high‐precision gravity survey in the Delaware Basin of southeastern New Mexico." GEOPHYSICS 50, no. 5 (May 1985): 825–33. http://dx.doi.org/10.1190/1.1441957.

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Since 1974, the Department of Energy has been studying bedded salt deposits in southeastern New Mexico as a possible location for disposing of defense‐generated transuranic and low‐level radioactive wastes. The program, known as the Waste Isolation Pilot Plant, includes intensive geologic characterization of about [Formula: see text] and construction of an underground test facility. The gravity survey reported here is part of the geologic site characterization. The gravity survey was conducted to delineate structural features near and at the proposed site. However, during the survey the gravity field was found to be dominated by effects of lateral density variations within relatively flat‐lying strata. Particularly distinctive is a pattern of elongate negative anomalies about one‐half mGal in amplitude. Boreholes in the anomalies encountered normal stratigraphy and no unusual geologic structures. However, borehole densilogs showed lower densities and uphole velocity surveys showed lower acoustic velocities than are measured outside of the anomalies. The low densities adequately account for the observed gravity anomalies. The regional stratigraphy contains water‐soluble minerals (halite, polyhalite, anhydrite‐gypsum, carbonates). Much of this material has dissolved and the region has been identified as a karstland. At the site, dissolution is slowly affecting the Rustler formation overlying the main salt‐bearing units. The low rock densities, associated with the negative gravity anomalies, are interpreted as due to alteration in the vicinity of solution conduits within the Rustler formation. This interpretation is supported by (1) partial coincidence between the negative gravity anomalies and closed topographic depressions (alluvial dolines); (2) greater anhydrite‐to‐gypsum conversion detected in boreholes within the anomalies; and (3) solution conduits encountered in one of the boreholes.
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Phelps, Geoff, Celine Scheidt, and Jef Caers. "Exploring viable geologic interpretations of gravity models using distance-based global sensitivity analysis and kernel methods." GEOPHYSICS 83, no. 5 (September 1, 2018): G79—G92. http://dx.doi.org/10.1190/geo2017-0742.1.

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ABSTRACT We have explored ways to integrate alternative geologic interpretations into the modeling of gravity data. These methods are applied to the Vaca Fault east of Fairfield, California, USA, where the structure across the fault is in question, and the Vaca Fault is used as a case study to demonstrate the method. The Vaca Fault is modeled using gravity data collected along a 10 km line perpendicular to the strike of the fault. Of particular interest is how the gravity data might inform on the dip of the Vaca Fault and thickness of the nonmarine section and whether spatial autocorrelation of density internal to the geologic units significantly influences the resulting gravity anomaly. We approach these questions by creating a suite of structural geologic models, which we then populate with geostatistically generated densities and from which the respective synthetic gravity anomalies are calculated. We perform distance-based generalized sensitivity analysis to identify which model inputs most leverage the calculated gravity anomaly. We then use multidimensional scaling to transform the gravity anomalies into a metric space and estimate the posterior probabilities of each structural geologic model using a Bayesian approach. We find that the gravity anomalies are particularly sensitive to zones of autocorrelated density values generated from geostatistical modeling. The structural geologic models most likely to produce gravity anomalies that match the observed data are the moderately dipping normal faults, 45° and 60°, although the probability that the fault dips more steeply, including in a strike slip or reverse fault orientation, is approximately 30%. The probability of a thicker nonmarine unit is 67%, more probable than a thinner nonmarine unit. This suggests that the Vaca Fault dips moderately to the east and truncates a thicker nonmarine unit, but that any further process modeling should include alternatives of the geologic structures.
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Dentith, M. C., A. Trench, and B. J. Bluck. "Geophysical constraints on the nature of the Highland Boundary Fault Zone in western Scotland." Geological Magazine 129, no. 4 (July 1992): 411–19. http://dx.doi.org/10.1017/s0016756800019506.

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AbstractPreviously published models of gravity anomalies across the Highland Boundary Fault in western Scotland interpret this structure as a high-angle reverse fault. These gravity anomalies have been re-interpreted in the light of more extensive gravity data now available, and new density data from the Highland Border Complex. The new data suggest that earlier interpretations have overestimated the fault anomaly and used over-simplified density models. New gravity models of the Highland Boundary Fault Zone are presented which show that the interface between the Dalradian and Highland Border Complex dips to the northwest at an angle of about 20°. We interpret the contact between these two formations as a thrust fault. The interface between the Highland Border Complex and the Lower Old Red Sandstone is shown to be vertical as suggested by surface geology, with the latter rocks a few hundred metres thick.
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Phelps, Geoff. "Forward modeling of gravity data using geostatistically generated subsurface density variations." GEOPHYSICS 81, no. 5 (September 2016): G81—G94. http://dx.doi.org/10.1190/geo2015-0663.1.

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Using geostatistical models of density variations in the subsurface, constrained by geologic data, forward models of gravity anomalies can be generated by discretizing the subsurface and calculating the cumulative effect of each cell (pixel). The results of such stochastically generated forward gravity anomalies can be compared with the observed gravity anomalies to find density models that match the observed data. These models have an advantage over forward gravity anomalies generated using polygonal bodies of homogeneous density because generating numerous realizations explores a larger region of the solution space. The stochastic modeling can be thought of as dividing the forward model into two components: that due to the shape of each geologic unit and that due to the heterogeneous distribution of density within each geologic unit. The modeling demonstrates that the internally heterogeneous distribution of density within each geologic unit can contribute significantly to the resulting calculated forward gravity anomaly. Furthermore, the stochastic models match observed statistical properties of geologic units, the solution space is more broadly explored by producing a suite of successful models, and the likelihood of a particular conceptual geologic model can be compared. The Vaca Fault near Travis Air Force Base, California, can be successfully modeled as a normal or strike-slip fault, with the normal fault model being slightly more probable. It can also be modeled as a reverse fault, although this structural geologic configuration is highly unlikely given the realizations we explored.
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Dissertations / Theses on the topic "Gravity anomalies Geophysics 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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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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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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Eskamani, Philip K. "Seafloor spreading in the eastern Gulf of Mexico| New evidence for marine magnetic anomalies." Thesis, Colorado State University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1564450.

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Possible sea-floor spreading anomalies are indentified in marine magnetic surveys conducted in the eastern Gulf of Mexico. A symmetric pattern of lineated anomalies can be correlated with the geomagnetic time scale using previously proposed opening histories for the Gulf of Mexico basin. Lineated magnetic anomalies are characterized by amplitudes of up to 30 nT and wavelengths of 45-55 km, and are correlatable across 12 different ship tracks spanning a combined distance of 6,712 km. The magnetic lineations are orientated in a NW-SE direction with 3 distinct positive lineations on either side of the inferred spreading ridge anomalies. The magnetic anomalies were forward modeled with a 2 km thick magnetic crust composed of vertically bounded blocks of normal and reverse polarity at a model source depth of 10 km. Remnant magnetization intensity and inclination are 1.6 A m-1 and 0.2° respectively, chosen to best fit the magnetic observed amplitudes and, for inclination, in accord with the nearly equatorial position of the Gulf of Mexico during Jurassic seafloor spreading. The current magnetic field is modeled with declination and inclination of and 0.65° and 20° respectively. Using a full seafloor spreading rate of 1.7 cm/yr, the anomalies correlate with magnetic chrons M21 to M10. The inferred spreading direction is consistent with previous suggestions of a North-East to South-West direction of sea-floor spreading off the west coast of Florida beginning 149 Ma (M21) and ending 134 Ma (M10). The opening direction is also consistent with the counter-clockwise rotation of Yucatan proposed in past models.

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Hegmann, Mary Jane. "Gravity and magnetic surveys over the Santa Rita Fault System, southeastern Arizona." Thesis, The University of Arizona, 1998. http://hdl.handle.net/10150/278675.

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Gravity and magnetic surveys were performed in the northeast portion of the Santa Rita Experimental Range, in southeastern Arizona, to identify faults and gain a better understanding of the subsurface geology. A total of 234 gravity stations were established, and numerous magnetic data were collected with portable and truck-mounted proton precession magnetometers. In addition, one line of very low frequency electromagnetic data was collected together with magnetic data. Gravity anomalies are used to identify two normal faults that project northward toward a previously identified fault. The gravity data also confirm the location of a second previously interpreted normal fault. Interpretation of magnetic anomaly data indicates the presence of a higher-susceptibility sedimentary unit located beneath lower-susceptibility surficial sediments. Magnetic anomaly data identify a 1-km-wide negative anomaly east of these faults caused by an unknown source and reveal the high variability of susceptibility in the Tertiary intrusive rocks in the area.
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Bennett, Randall. "Gravity Investigation of a Normal Fault in Southern St. Landry Parish, Louisiana." Thesis, University of Louisiana at Lafayette, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10981215.

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Previous work conducted by Kushiyama (2010) identified a relative gravity profile with an abnormal anomaly across a normal fault. The relative gravity should have decreased when crossing from the upthrown side to the downthrown side. Additional relative gravity data were collected and incorporated with the existing data to create an improved gravity anomaly map. The map shows that the gravity generally increases from the southwest to the northeast in the study area. In two areas where profiles cross the fault at nearly a perpendicular angle, the fault is clearly visible and interpretable from the gravity data. However, along Chris Road, that is not the case. This is most likely caused by an underlying salt ridge (Varvaro, 1958). The mobilization of this salt upwards through more dense strata might be the cause of the low gravity effect of the upthrown side of the fault along Chris Road.

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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 (Te) of the underlying lithosphere. Existing Eastern USA margin Te estimates range from less than 10km to more than 30km. In this study it is shown that high strengths of 10 - 40km Te are confined to structural arches dividing the broadest marginal basins, while low strengths of less than 10km Te 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 Te 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 Te 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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Huang, Ou. "Terrain Corrections for Gravity Gradiometry." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1339698991.

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Books on the topic "Gravity anomalies Geophysics Geology"

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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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Martínez, Myriam Patricia. La Sierra Pampeana de Valle Fértil, Provincia de San Juan: Análisis estructural a partir de datos gravimétricos. Rosario: UNR Editora, 1999.

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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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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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Langenheim, Victoria E. Gravity data collected along the Los Angeles Regional Seismic Experiment (LARSE) and preliminary model of regional density variations in basement rocks, southern California. [Menlo Park, CA]: U.S. Geological Survey, 1996.

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Book chapters on the topic "Gravity anomalies Geophysics Geology"

1

Kaban, Mikhail K. "Gravity Anomalies, Interpretation." In Encyclopedia of Solid Earth Geophysics, 456–61. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_88.

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Kaban, Mikhail K. "Gravity Anomalies, Interpretation." In Encyclopedia of Solid Earth Geophysics, 1–7. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10475-7_88-1.

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Kaban, Mikhail K. "Gravity Anomalies, Interpretation." In Encyclopedia of Solid Earth Geophysics, 585–91. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_88.

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Hackney, Ron. "Gravity, Data to Anomalies." In Encyclopedia of Solid Earth Geophysics, 524–33. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_78.

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Hackney, Ron. "Gravity, Data to Anomalies." In Encyclopedia of Solid Earth Geophysics, 1–10. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10475-7_78-1.

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Hackney, Ron. "Gravity, Data to Anomalies." In Encyclopedia of Solid Earth Geophysics, 668–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_78.

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Caputo, Michele. "Gravity Surveys at Sea by the Institute of Geophysics At Ucla." In Gravity Anomalies: Unsurveyed Areas, 23–25. Washington, D.C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm009p0023.

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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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Trivedi, Sonam, Prashant Kumar, Mahesh Prasad Parija, and Arkoprovo Biswas. "Global Optimization of Model Parameters from the 2-D Analytic Signal of Gravity and Magnetic Anomalies Over Geo-Bodies with Idealized Structure." In Springer Geophysics, 189–221. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28909-6_8.

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Walcott, R. I. "Lithospheric Flexure, Analysis of Gravity Anomalies, and the Propagation of Seamount Chains." In The Geophysics of the Pacific Ocean Basin and Its Margin, 431–38. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm019p0431.

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Conference papers on the topic "Gravity anomalies Geophysics Geology"

1

Blecha, V. "Measured and Modeled Gravity Anomalies above the Tunnel in Clays – Implication for Errors in Gravity Interpretation." In Near Surface 2011 - 17th EAGE European Meeting of Environmental and Engineering Geophysics. Netherlands: EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20144380.

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Staisch, Lydia M., Harvey Kelsey, Harvey Kelsey, Brian L. Sherrod, Brian L. Sherrod, Richard J. Blakely, Richard J. Blakely, Richard H. Styron, and Richard H. Styron. "FROM GRAVITY ANOMALIES TO GRADED STREAMS: ASSESSING EARTHQUAKE HAZARDS IN CENTRAL WASHINGTON STATE WITH GEOPHYSICAL, GEOLOGIC, AND GEOMORPHIC CONSTRAINTS." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-303244.

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Chernov, A. A., L. T. Berezhnaya, D. A. Fedinsky, and M. A. Telepin. "Effective geology interpretation of gravity and magnetic data by use of advanced methods and techniques." In Russian Airborne Geophysics and Remote Sensing, edited by Norman Harthill. SPIE, 1993. http://dx.doi.org/10.1117/12.162875.

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Krishnamacharyulu, S. K. G. "Gravity and Magnetic Anomalies of Overlapping and Closely Spaced Multiple Bodies." In Near Surface Geoscience 2016 - 22nd European Meeting of Environmental and Engineering Geophysics. Netherlands: EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201602081.

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Policarpov, V. K., S. A. Kozlov, N. F. Skopenko, and M. B. Shtokalenko. "Interpreting of Magnetic and Gravity Anomalies for Regional Oil and Gas Prognosis." In Geophysics of the 21st Century - The Leap into the Future. European Association of Geoscientists & Engineers, 2003. http://dx.doi.org/10.3997/2214-4609-pdb.38.f090.

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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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Abstract:
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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Teranishi, Y., H. Mikada, T. Goto, and J. Takekawa. "Three-dimensional Joint Inversion of Gravity and Magnetic Anomalies Based on Density-Magnetization Relationship." In The 16th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2012). Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2352-8265.20140135.

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Teranishi, Y., H. Mikada, T. Goto, and J. Takekawa. "Three-Dimensional Joint Inversion of Gravity and Magnetic Anomalies Using Fuzzy C-Means Clustering." In The 17th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2013). Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2352-8265.20140160.

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Teranishi, Y., H. Mikada, T. Goto, and J. Takekawa. "Three-Dimensional Joint Inversion of Gravity and Magnetic Anomalies Using Fuzzy C-means Clustering." In The 18th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2014). Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2352-8265.20140178.

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Gonzalez Quiros, A., and J. P. Fernández Álvarez. "Incorporation of Unsaturated Zone Effects in Coupled Hydrogeophysical Modelling of Gravity Anomalies Caused by Pumping Tests." In NSG2020 26th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202020134.

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Reports on the topic "Gravity anomalies Geophysics Geology"

1

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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Shih, K. G., R. Macnab, R. K. McConnell, D. B. Hearty, J F Halpenny, and J. Woodside. Regional geology and geophysics 2: gravity anomaly. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/210592.

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