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 870 for “"volcanic"”.
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Volcanic skyscapes
Explosive volcanic eruptions are some of the most visually impressive natural phe-nomena, and are frequently represented in visual media such as films or games, usually with a bespoke, one-off solution. Existing plume models treat the atmo-sphere as a static boundary, while existing atmosphere …
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Quantifying future volcanic impacts on climate projections and their uncertainties using stochastic volcanic emissions
Explosive volcanic eruptions can inject sulfur dioxide into the stratosphere, forming sulfate aerosols that alter Earth’s radiative balance leading to abrupt climatic changes. Despite the importance of volcanic stratospheric aerosols for climate, current climate projection studies rely on two …
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Attenuation of volcanic seismic signals
Low frequency volcanic earthquakes, characterised by slowly decaying harmonic codas of 0.5-5Hz, have been observed on many volcanoes and are considered key tools in monitoring and eruption forecasting. The common element in a variety of models proposed for the origin of these earthquakes is …
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Fracture mechanics of volcanic eruptions
Seismology is a key tool in the forecasting of volcanic eruptions. The onset of an eruption is often preceded and accompanied by an increase in local seismic activity, driven by fracturing within the edifice. For closed systems, with a repose interval of the order of a century or more, this …
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CO2 Adsorption On Volcanic Ash: Net Contribution Of Volcanic Eruptions To The Global Carbon Cycle
… a small percentage of the terrestrial co2 sink. Volcanic ash is virtually free of co2 when erupted and has a high surface area resulting in a high capacity for co2 adsorption. Volcanism is commonly assumed to be only a source of co2, but pyroclastic eruptions can also potentially serve as a sink. …
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Microbial Diversity in Young Volcanic Soils
… and modeling of carbon flux from young volcanic soils.
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Modeling volcanic unrest by data assimilation
Volcanic activity may lead to potential volcanic eruptions, but it also provides critical information for understanding the physical processes within a volcanic system. Combining multiple observations and advanced physical models allows us to explore the response of the surrounding host rock to …
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Characterising subaerial basaltic ‘a‘ā lava flows as potential geothermal reservoirs: Nordeste volcanic complex, Volcanic, São Miguel, Azores
… power plant (Ribeira Grande) within the central volcanic complex of Fogo. Neighbouring this is the basaltic Nordeste volcanic system. Few detailed studies have been published on the facies and facies architecture of Nordeste, with this study aiming to providing an analysis of the exposed ‘a‘ā …
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Exploring the use of quantitative modelling approaches to support volcanic crisis management in the Auckland Volcanic Field
… decision to call an evacuation during a volcanic crisis is complex and challenging, in part due to uncertainties related to the behaviour of the volcano. This thesis investigates the use of quantitative hazard and risk modelling approaches to support such decision-making during a volcanic …
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Volcanic and sedimentary processes in phreatomagmatic volcanoes
… to :- extreme alteration, rapid syn- and post-volcanic reworking, low ejecta volumes and breaching and burial beneath later lavas. In contrast the sedimentary structures petrography, morphology and grain size characteristics of diatreme tuffs are shown to be often sufficiently well preserved to …
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Modelling the atmospheric chemistry of volcanic plumes
… system. Once released into the atmosphere, volcanic emissions rapidly undergo a complex series of chemical reactions. This thesis seeks to further the understanding of such processes by both observation and numerical modelling. I have adapted WRF-Chem to model passive degassing from Mount …
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Forecasting volcanic unrest through geodetic data assimilation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Investigating Volcanic and Glacial Processes Using Microseismicity
… microseismicity before and after the Bardarbunga volcanic eruption, the largest eruption in Iceland in 230 years, to study possible pathways of melt from the deep crust to the shallow melt storage region. The seismicity and earthquake source mechanisms suggest that melt travels along a pathway …
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Rare earth fractionation in Hawaiian volcanic rocks.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1966. Ph.D.
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The impact of volcanic halogens, climate change, and sulfate aerosol geo-engineering on the atmospheric effects of volcanic eruptions
The evolution of volcanic sulfur, stratospheric composition and radiative forcing following explosive volcanic eruptions injecting sulfur directly into the stratosphere is well understood. However, how the co-emission of volcanic halogens, climate change, and concurrent sulfate aerosol …
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Geophysical and geochemical constraints on submarine volcanic processes
Submarine volcanic systems form new oceanic crust, host unique chemosynthetic ecosystems, concentrate rare metals, and provide a conduit for chemical transfer from the Earth's interior to hydrosphere. Although our understanding of submarine volcanoes has been historically limited due to their …
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The Co-Volcanic Ionospheric Disturbances at Mt.Etna, Italy
… to improve the studies on natural hazards. Volcanic eruptions perturb the atmosphere by changing temperature, pressure and density of the surrounding air. In particular, the thermodynamic forcing from explosive eruptions can generate acoustic-gravity waves that, due to the exponential …
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