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 20 of 772 for “"geophysical"”.
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Resistivity interpretation in geophysical prospecting
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1959.
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Nontraditional approximation in geophysical fluid dynamics
In the conventional approach to geophysical fluid dynamics, only the horizontal components of the Coriolis force due to horizontal motions of the fluid are taken into account. All the other components of the Coriolis force, which are called the non-traditional (NT) terms, are considered to be small …
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Archaeological geophysical prospection in peatland environments.
… aimed to examine the potential for conventional geophysical survey methods (resistivity, gradiometry, ground penetrating radar and frequency domain electromagnetic) as site prospection and landscape investigation tools in peatland environments. It examines previous attempts to prospect peatland …
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Geophysical investigations of icebergs in Antarctica
One of the most important technical questions relating to iceberg transport are the causes of disintegration of the iceberg at sea. In order to obtain a better understanding of the factors involved in the response of icebergs to the environment, an automatic data collection platform was placed on a …
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LAKEMAGING: GEOPHYSICAL DATA INTEGRATION FOR GROUNDWATER MODELLING
… subsurface heterogeneity. In this context, geophysical methods, and especially electrical and electromagnetic techniques, provide spatially continuous information that can improve conceptualization of aquifer systems. However, their integration into hydrogeological workflows remains …
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Geophysical investigations in the English Lake District
… and Skiddaw granites have been analysed from geophysical logs recorded in 300 m deep heat-flow boreholes. New density determinations have been made on outcrop samples from over 350 localities in the western and central Lake District. Samples have been classified in terms of their lithology and …
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Integrated geophysical studies at Masaya volcano, Nicaragua
… The acquisition of extended temporal and spatial geophysical data will also allow for the development of robust models for the dynamics of magmatic systems. Masaya volcano, Nicaragua, is one of the most active systems in Central America, making it an excellent natural laboratory for this study. It …
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Geophysical Imaging of Karst Features in Missouri
<p>"Automated electrical resistivity tomography (ERT) supported with multichannel analysis of surface waves (MASW) and boring data were used to map karst related features in Missouri in order to understand karst processes better in Missouri. Previous works on karst in Missouri were mostly surficial …
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Scattering Techniques for the Geophysical Inverse Problem
We consider the inverse problem for the propagation of elastic waves in stratified media. The one-dimensional inverse problem for the propagation of shear waves is studied in the context of spectral theory. We generalize certain inverse scattering methods in quantum mechanics to determine the …
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Visual search asymmetries in complex geophysical displays
Electronic displays such as geophysical maps can become heavily cluttered (e.g. Lohrenz, Trafton, Beck, & Gendron, 2009), hindering operators’ accurate detection of task-critical information. The use of visual search asymmetries (Treisman & Souther, 1985) in the design of display iconography might …
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The Dynamics of Geophysical and Astrophysical Turbulence
Turbulence is ubiquitous within geophysical and astrophysical fluid flows. Its interaction with physical ingredients such as rotation and stratification gives rise to spectacular dynamics, including the layering of material properties, which in turn influence the transport and distribution of heat, …
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Modelling dispersion and mixing in geophysical flows
This thesis is concerned with modelling geophysical flows. The problems considered in this work include dispersion in flows through heterogeneous porous rocks, turbulent mixing in the surface layer of the ocean, and mixing in turbulent starting plumes. In chapters 2, 3 and 4, we study the …
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Ultrasonic laboratory tests of geophysical tomographic reconstruction
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1986.
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Improved uncertainty estimates for geophysical parameter retrieval
Algorithms for retrieval of geophysical parameters from radiances measured by instruments onboard satellites play a large role in helping scientists monitor the state of the planet. Current retrieval algorithms based on neural networks are superior in accuracy and speed compared to physics-based …
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A programme for geophysical exploration in Ghana
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.
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Geophysical Investigation of the Yellowstone Hydrothermal System
Yellowstone National Park hosts over 10,000 thermal features (e.g. geysers, fumaroles, mud pots, and hot springs), yet little is known about the hydrothermally active zones hundreds of meters beneath the features. Transient electromagnetic (TEM) soundings and 2D direct current (DC) resistivity …
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Geophysical and petrological constraints on ocean plate dynamics
… motion of oceanic lithospheric plates through geophysical and petrological methods. Ocean crust and lithosphere forms at mid-ocean ridges as the underlying asthenosphere rises, melts, and flows away from the ridge axis. In Chapters 2 and 3, I present the results from partial melting experiments …
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