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Showing 1 to 19 of 19 for “"Geophysical Investigations"”.
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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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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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Airborne geophysical investigations of subglacial structure of West Antarctica
… evolution of West Antarctica. An airborne geophysical survey in West Antarctica comprising simultaneous Radio Echo Sounding (RES) and magnetics was carried out over -1 M km$^{2}$ of the ice covered area. The collection and reduction of large volumes of RES and magnetic data are described. …
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Geophysical investigations of near-surface mine sites in northern West Virginia
… based on limited subsurface information. Use of geophysical techniques to characterize these sites, monitor remedial efforts, and provide additional subsurface information is evaluated in this study. Terrain conductivity (EM31 and EM34) grids as well as resistivity and magnetic profiles were …
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Time-lapse Geophysical Investigations over Known Archaeological Features Using Electrical Resistivity Imaging and Earth Resistance
Electrical methods of geophysical survey are known to produce results that are hard to predict at different times of the year, and under differing weather conditions. This is a problem which can lead to misinterpretation of archaeological features under investigation. The dynamic relationship …
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Subsurface Geophysical Investigations of Oneida Lake Ny: Insights Into Ice Sheet Processes and Deglaciation At Termination I
… bedforms of the Oneida Lake basin. Subsurface investigations of the glacial deposits in the Oneida Basin provide insights into LIS recession and ice stream activity in the basin and contribute to establishing the extent of the sedimentary materials available for paleoclimate reconstructions …
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Benthic foraminifera from the Orange-Luderitz shelf, southern African continental margin
… undertaken as an adjunct to sedimentological and geophysical investigations being conducted by members of the Joint Geological Survey/University of Cape Town Marine Geoscience Group. 117 species in 65 genera of benthic foraminifera are described and illustrated, and five bathymetric zones are …
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Contribution of Recharge Along Regional Flow Paths to Discharge at Ash Meadows, Nevada
… signatures in the water, as well as geologic and geophysical constraints, and determines that flow from beneath the Yucca Mountain area is the most viable source of groundwater for the springs at Ash Meadows. Isotopic signatures also indicate that recharge likely occurred during the last pluvial, …
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Using electrical resistivity tomography to calibrate seawater intrusion models along the Alabama Gulf Coast
… reduced through the integration of field geophysical measurements. Field measurements employing electrical resistivity tomography (ERT) were utilized to calibrate a density-dependent groundwater flow model for Gulf Shores, Alabama. Specifically, six independent ERT profiles were produced …
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Evaluation of geophysical methods to characterize alluvial soils in the arid environment
Non-intrusive geophysical investigations, both seismic and electrical, were performed at several locations on the Las Vegas Springs Preserve in Las Vegas, Nevada, along with intrusive drilling. These investigations were conducted to determine whether it is possible use geophysical methods to detect …
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Geophysical assessment of soil and rock in the New Madrid seismic zone
… from a site in Arkansas. In both instances, geophysical investigations were conducted to characterize the subsurface. At the Illinois site, borehole control, downhole seismic (DHS), seismic refraction tomography (SRT) and multichannel analysis of surface waves (MASW) data were acquired for …
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GIS-based spatial analysis coupled with geophysical imaging to identify and evaluate factors that control the formation of karst sinkholes in southwestern Missouri
… GIS-based spatial analyses and site-specific geophysical data. GIS-based spatial analysis was employed to identify significant physical factors that appeared to influence the formation and distribution of sinkholes. Seven out of the twelve most cited factors influencing sinkhole development …
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A geophysical characterization of New River terrace deposits in Giles County, Virginia
… Giles County, southwest Virginia. Geological and geophysical investigations were utilized to characterize the terrace deposits and investigate the nature of the observed faults. Geologic mapping of the underlying carbonate bedrock provided orientation measurements of fault, bedding, and joint …
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Detection of a Landslide Glide Plane Using Seismic Reflection Methods: Investigation at Little Valley Landslide in Draper, Utah
An integration of geological and geophysical techniques has been used to characterize the internal structure of the Little Valley Landslide in Draper, Utah, USA. The Little Valley Landslide is a pre-historic landslide as old as 13ka B.P. It is found to consist of chaotic and disturbed weathered …
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The marine geology of Mossel Bay, South Africa
… the South Coast of South Africa. Three marine geophysical surveys and scuba diving were used to examine evidence of past sea-level fluctuations and interpret geological deposits on the seafloor. Additional geological mapping of coastal outcrops was carried out to link land and sea features and …
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Remote Sensing Studies of Svalbard Glaciers
… glaciers. The results are compared with previous geophysical investigations of ice thickness on Spitsbergen, revealing problems concerning existing Soviet radio echo sounding data obtained at higher frequencies. An internal layer echo was interpreted as the bed by Soviet workers. Second, the ice …
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Imaging and mitigating karst features
… that combines both conventional and geophysical techniques has been conducted near Springfield in southwest Missouri, United States. This study, which forms part of the comprehensive subsurface investigation, aimed to (1) image and characterize the subsurface, (2) map variations in …
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Seismic reflection imaging of near surface structures using the Common Reflection Surface (CRS) Stack Method
… with budgets available for near-surface geophysical investigations. Improving seismic imaging of near-surface reflection data, while at the same time reducing processing costs and human interaction during processing was the principal objective which guided my work. To investigate the …
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Seasonal geochemical and isotopic investigations for sustainable water resource managementa case study of the pordenone plain (NE Italy)
… geological, hydrogeological, geochemical, and geophysical investigations is necessary to identify and characterize the sources and driving mechanisms. Understanding the responses of aquifers to both natural and human-induced stresses is essential, as it allows for the development of practical …