Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Gravity Modeling"”.
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High-Fidelity Gravity Modeling Applied to Spacecraft Trajectories and Lunar Interior Analysis
… capabilities, high-accuracy and high-resolution gravity models and the tools to exploit such models are increasingly attractive within the context of spaceflight mechanics, mission design and analysis, and planetary science in general. First, in trajectory design applications, a gravity …
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The crust and upper mantle structure of eastern Anatolia, Turkey from gravity modeling constrained by seismic data
… evolution of Eastern Anatolia, a 2.5-D gravity model of the crust and upper mantle structure between 38°E/37°N and 44°E /41°N was developed using terrestrial and satellite gravity data. The model is constrained by all available geological and geophysical data. The results of the gravity …
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Interpretation of Potential Fields by Modern Data Processing and 3-dimensional gravity Modeling of the Dead Sea Pull-Apart Basin / Jordan Rift Valley (JRV)
This work presents the analysis, 3D modeling and interpretation of gravity and aeromagnetic data of Jordan and Middle East. The potential field data delineate the location of the major faults, basins, swells, anticlines, synclines and domes in Jordan. The surface geology of Jordan and the immediate …
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Gravity Modeling, Seismic Stratigraphy, and Thermal Maturity Modeling of Hydrocarbons of the Permian Foreland Basin, USA, and the Sergipe-Alagoas Rifted-Passive Margin, Brazil
… two basins. In Chapter 2, I created 2D and 3D gravity models to better define the tectonic origin of the Abilene gravity minimum (AGM) underlying the northern Permian Basin. I inferred the AGM as a Precambrian rift zone composed of lower density granitic and metasedimentary rocks. Basement …
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Proterozoic structures in north-central North Dakota: a gravity study
… and longitude 100 and 102 degrees west, using gravity modeling. Major structural and geochronologic boundaries beneath the eastern flank of the Williston Basin in North Dakota and southern Canada appear as coherent patterns on a Bouguer gravity map. </p><p> The contribution of the Phanerozoic …
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Seismic Reflection and Gravity Constraints on the Bedrock Configuration in the Greater East Missoula Area
… is mapped. Currently, a map based heavily on a gravity survey provides the most detailed map of the bedrock. The accuracy of this map may be improved through the use of seismic reflection techniques, better estimates of the density contrast used in the gravity modeling, and by extending the …
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Seismic Reflection and Gravity Constraints on the Bedrock Configuration in the Greater East Missoula Area
… is mapped. Currently, a map based heavily on a gravity survey provides the most detailed map of the bedrock. The accuracy of this map may be improved through the use of seismic reflection techniques, better estimates of the density contrast used in the gravity modeling, and by extending the …
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Seismic delineation of the southern margin of the middle Devonian prairie evaporite in the Elk Point Basin, south-central Saskatchewan
… the effects of the basin fill on regional gravity signatures and to determine whether the effect of the salt edge could be observed in gravity data, two gravity profiles crossing the salt collapse margin and the Trans-Hudson Orogen and the Wyoming Structural Province were analysed. …
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A geophysical investigation of a concealed granitoid beneath Lumberton, North Carolina
… granitic pluton. This hypothesis is supported by gravity data, which show a -35 mgal Bouguer gravity anomaly, and the relatively high heat flow of 63.4±5 mW/m² obtained in the drill hole, both of which are characteristic of Hercynian granitic plutons in the southeastern United States. Gravity …
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Crustal structure and evolution beneath the Colorado Plateau and the southern basin and range province
… has an anomalously large density as revealed by gravity modeling and high velocities in seismic refraction lines, contributed to the long-term stability and pre-uplift low elevation of the Colorado Plateau in the study area"--Abstract, page iv.</p>
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Receiver function investigations of mantle transition zone and crustal structure in East Africa and Northeast Asia
… Zone (MRZ) has been investigated using RFs and gravity modeling. The small crustal stretching factor is consistent with the general absence of volcanism in the MRZ. The high V<sub>p</sub>/V<sub>s</sub> beneath the southern MRZ may indicate the existence of partial melting. Abnormally low …
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A model of the crust and upper mantle structure of the Hellenic and Cyprus subduction zones constrained by gravity and seismic data
… material on crustal structure, 2.5-D and 3-D gravity models of the Aegean-Anatolian region (24°-33° E and 34°-40° N) have been developed. The gravity model is based on satellite-derived and terrestrial gravity data from the European Improved Gravity Model of the Earth (EIGEN-6C2). The …
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Origin and Tectonic Evolution of Gondwana Sequence Units Accreted to the Banda Arc: A Structural Transect through Central East Timor
… of sandstones, detailed structural analysis and gravity modeling were conducted to investigate the origin of the Gondwana Sequence in the Timor Region, and to better constrain the tectonic evolution of the active Banda Arc. Our field studies and U/Pb zircon age analysis helped assign most units …
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Processed Food Exports from Developing Countries: Patterns, Determinants, Policy Issues
… a trade equation derived from a standard gravity modeling framework. The findings indicate that ability to comply with international food safety standards plays a crucial role in explaining inter-country differences in processed food export performance. However, food safety requirements …
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Processed Food Exports from Developing Countries: Patterns, Determinants, Policy Issues
… a trade equation derived from a standard gravity modeling framework. The findings indicate that ability to comply with international food safety standards plays a crucial role in explaining inter-country differences in processed food export performance. However, food safety requirements …
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Chebyshev spectral methods for potential field computation
… Poisson's equations and apply them to 3-D gravity and DC resistivity modeling. When we approximate a function by a finite sum of Chebyshev polynomials, there are two kinds of errors: truncation and aliasing. We present a cell-average discretization scheme to reduce the aliasing error. Both …
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Signatures of present and past melt distribution along fast and intermediate spreading centers
… near ridge propagators wakes, a combination of gravity and multi-channel seismic data was used. Gravity modeling, constrained by seismic data, showed that robust topography (shallow axial depth and wide axial high) and thicker crust observed for the southern portion of this ridge system …
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International Agricultural Trade Costs and Non-Tariff Measures
… estimation procedure based on structural gravity models. Our findings reveal unequal integration of world economies into agricultural trade, with heterogeneous trade costs among countries. Only high-income countries have achieved lower agricultural trade costs between 2001 to 2018. The …
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Geophysical constraints on the flexural subsidence of the Denver Basin
… American craton. A ~400 mGal negative Bouguer gravity anomaly exists over the Denver Basin and Front Range Uplift, with its minimum located over the highest topography in the central part of the uplift, approximately 100 km west of the Denver Basin. This study examines three hypotheses …