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 21 for “"Geophysical Investigation"”.
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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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A geophysical investigation of large-scale glaciotectonic deformation, Ludington Ridge, Michigan
Thesis (M.S.)--Michigan State University. Dept. of Geological Sciences, 2008
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Integrated geophysical investigation for understanding agriculturally induced landslides in southern Peru
This thesis presents results of near-surface geophysical surveys conducted at the Majes I agricultural development (60 km west of Arequipa, Peru) where the nexus of geology and agriculture has increased landslide activity along the Majes-Siguas River Valley. The specific project goals were to …
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A geophysical investigation of a concealed granitoid beneath Lumberton, North Carolina
Interpretation of geophysical data obtained near Lumberton, North Carolina suggests the presence of a granitic pluton buried beneath Slate Belt-like rocks. A 239 m drill core retrieved from a hole 7.5 km southeast of the city of Lumberton consists of interlayered felsic and mafic volcanics of lower …
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Geophysical investigation of Vesta, Ceres and the Moon using gravity and topography data
… are in hand, typically, a wide range of possible geophysical structures is possible. The reader will find that this problem of non-unique solutions permeates all chapters of this thesis. The general strategy to reduce non-uniqueness is to find ways to use additional observations that are sensitive …
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A Geophysical Investigation Of The Northeastern Rim Of The St. Martin Impact Structure, Manitoba, Canada.
… known locally as Big Rock. The purpose of this investigation was to determine the relationship of Big Rock, if any, to the impact event and to constrain a more accurate diameter of the structure.</p> <p>To accomplish this I conducted two geophysical surveys and used selected data from a previous …
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Geophysical investigation and assessment of the Rye Patch Known Geothermal Resource Area, Rye Patch, Nevada
… previous seismic, aeromagnetic and geochemical investigations was also examined and incorporated. Filtering methods including removal of a polynomial trend surface and wavelength filtering were utilized on the gravity data to remove the strong regional overprint caused by the large density …
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A geophysical investigation of geologic structure and regional tectonic setting at the Savannah River site, South Carolina
Time-structure, isochron, and reflection amplitude maps were constructed from 270 km of reprocessed seismic reflection data recorded at the Savannah River Site (SRS), South Carolina. These maps indicate the presence of three major basement blocks bounded by northeast trending faults that penetrate …
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Nature and Potential Origins of the Low-Rate Tectonics of the Hauraki Rift and North-Western New Zealand: A Geophysical Investigation
Little is known about the nature or origin of tectonic activity throughout north-western New Zealand, beyond that it is a stable environment (velocities ~1 mm/yr relative to Australia) and home to the Hauraki Rift, N-S trending, 250+ km long and 25 km wide on-shore/off-shore continental rift 40 km …
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GEOPHYSICAL INVESTIGATION OF GLACIER GEOMETRY AND SUBGLACIAL GEOLOGY, AND THEIR INFLUENCE ON GLACIER DYNAMICS: CASE STUDIES OF TAKU GLACIER, ALASKA AND THWAITES GLACIER, WEST ANTARCTICA
… poorly constrained. We employ a multi-modal geophysical technique, utilizing a combination of seismic and gravity- and magnetic-anomaly data. Taku Glacier is a tidewater glacier located in the Juneau Icefield, Alaska. Until recently, the Taku had been advancing or stable in contrast to most …
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Geology of the passive margin off New England
The results of a detailed geophysical investigation conducted by the Woods Hole Oceanographic Institution in 1975 have been used in conjunction with other available information to reconstruct the geologic history of the passive continental margin off New England. Rifting between northeastern North …
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Multi-sensor platforms for the geophysical evaluation of sensitive archaeological landscapes. Evaluation of and improvement of the MSP40 mobile sensor device for rapid multi-technique and low impact measurements on archaeological sites with vulnerable soil.
… and a microtopographic surveys. Ground based geophysical investigation will always have a physical impact on a site. The MSP40 is no exception but careful selection of wheel types and the lightweight frame limit the damage compared to many mobile arrays. The MSP40 has been tested on a number …
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Bioturbation in Supratidal Carbonates: Georadar Characterization of the Patterns and Structure of Decapod Burrows
… This study is the first high-resolution geophysical investigation of three decapod species inhabiting adjacent coastal biotopes on San Salvador Island. Extensive (>2 km) 800 MHz georadar surveys captured a diverse suite of >120 burrows of ghost (Ocypode quadrata), blackback (Gecarcinus …
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Laboratory Resistivity Measurements for Soil Characterization
… and capacitively coupled resistivity (CCR), are geophysical methods that offer a non-destructive and rapid means to collect continuous data. As such, ERT and CCR are becoming increasingly popular tools for geotechnical engineers; however, it is challenging to derive geotechnical information such …
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Formation and Evolution of Valdivia Bank, Walvis Ridge, South Atlantic Ocean from Geophysical Data and International Ocean Discovery Program Expedition 391 Drilling Results
… Valdivia Bank has until recently lacked detailed geophysical investigation and coring, obscuring the formation history and evolution of this plateau. Geochemical and paleomagnetic studies suggest that Valdivia Bank is complex, revealing a potential microplate and ridge reorganization in the Late …
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Structure and regional tectonic setting across the Atlantic Coastal Plain of northeastern Virginia as interpreted from reflection seismic data
This study is a geophysical investigation that uses reflection seismic and potential field data to contribute to the development of a structural model of the North American Atlantic Passive Margin beneath the Atlantic Coastal Plain of northeastern Virginia. Specifically, this study focuses between …
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RESISTIVITY IMAGING OF PROMINENT SEEPAGE PATHWAYS IN KARST TERRAIN
<p>"An integrated research approach was conducted to evaluate subsurface karstic conditions in Greene County, southwestern Missouri. Electrical resistivity tomography (ERT) was employed to image anomalously low resistivity zones associated with the presence of seepage pathways that were …
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Development of risk-based groundwater operating rules: a case study of Siloam Village, South Africa
… of the GW-PITMAN model. Detailed geological and geophysical investigation are required to improve on characterisation of the GRU and its hydrogeological conceptual model. Undertaking a study of this nature in other areas including those which are data-scarce could promote wide implementation of …
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