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 168 for “"Volcanoes"”.
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A reconnaissance among some volcanoes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology, 1924.
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Volcanic and sedimentary processes in phreatomagmatic volcanoes
Phreatomagmatic volcanoes form when ascending magma explosively interacts with surface or groundwater at shallow depths. Three types of phreatomagmatic activity are recognised- phreaticp phreatomagmatic (s. s. ) and surtseyan - based on the degree of involvement of magma with water and the depth of …
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Investigations of Anomalous Earthquakes at Active Volcanoes
… edifices or magmatic plumbing systems of active volcanoes. Two seismicity catalogs from the Global Centroid Moment Tensor (CMT) Project are used to search for further examples of shallow earthquakes with robust vertical-CLVD focal mechanisms. CMT solutions for approximately 400 target earthquakes …
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Degassing Behaviour of Basaltic Open Vent Volcanoes
This thesis investigates two problems in the field of volcanology by using a combination of remote sensing of volcanic gases, magma modelling and fluid dynamics. The first problem relates to gas-flow through particle-liquid suspension; with relevance for understanding the mechanism of intermittency …
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Dormant Images: Documentary Film, Volcanoes, and the Archive
This thesis explores the intersections of volcanoes and the archive in documentary moving images. Responding to two growing interests across the humanities – in geological materialities and temporalities and in the physical site and concept of the archive – the thesis examines the largely unmapped …
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Heat transfer in active volcanoes: models of crater lake systems
Heat transfer in active volcanoes was investigated in this thesis. A general model of a crater lake system was developed that takes inputs of lake temperature, volume, chemical content, and meteorological conditions, and outputs the mass, energy, and chemical flows to and from the lake. The model …
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Magmatic processes at basaltic volcanoes: insights from the crystal cargo
… of melts and short magma storage times, these volcanoes provide the best means of unravelling the mantle and crustal contribution to geochemical heterogeneity observed in erupted samples. Despite the potential chemical complexity of a magma reservoir, evidence for magma processing and reaction …
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Rural groundwater supply for the Volcanoes National Park region, Rwanda
… season, the people are obliged to go into the Volcanoes National Park to get water from springs and swamps, disrupting the fragile ecosystem by the human activity. All these factors make it important to provide water at the point of use. Since the region receives a considerable amount of rain …
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
Volcanoes emit metal and metalloid elements in the gas phase at rates that are comparable to industrial emissions of entire countries or regions. These elements (e.g., Cu, Zn, Pb, As, Se), collectively referred to as ‘metal pollutants’ or ‘heavy metals’, can be critical nutrients at low levels, but …
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Towards monitoring volcanoes in Iceland and Hawai’i with seismic velocity variations
… is an exciting technique for studying volcanoes because it provides a continuous measurement of relative seismic velocity (dv/v), which is sensitive to magmatic processes that affect the physical properties of the surrounding crust. However, understanding the causal mechanisms …
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RESISTIVITY STRUCTURE BENEATH SAKURAJIMA AND MERAPI VOLCANOES INFERRED FROM MAGNETOTELLURIC(MT) SURVEY
本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである
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Thermally generated convection and precipitation over volcanoes: Numerical modelling of flow over Montserrat
… an active volcano. Intense rainfall over active volcanoes is known to trigger dangerous volcanic hazards, from remobilising loose surface material into lahars or mudflows, to initiating explosive activity such as pyroclastic flows. The effect of a heated volcanic surface on the atmospheric …
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Geochemical heterogeneity in the Hawaiian plume : constraints from Hawaiian volcanoes and Emperor seamounts
The 6000-km long, age-progressive linear Hawaii-Emperor Chain is one of the best defined hotspot tracks. This hotspot track plays an important role in the plume hypothesis. In this research, geochemical data on the Hawaiian-Emperor lavas are used to evaluate the plume hypothesis. There are …
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Evolution of Icelandic central volcanoes : evidence from the Austurhorn Plutonic and Vestmannaeyjar volcanic complexes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1989.
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An investigation of complex deformation patterns detected by using InSAR at Llaima and Tendürek volcanoes
… monitoring of the surface displacement at volcanoes therefore might allow the forecasting of upcoming eruptions to some extent. In geophysics, the measured surface displacements allow the parameters of possible deformation sources to be estimated through analytical or numerical modeling. …
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Insights into the edifice stability of oceanic volcanoes from direct shear experiments and numerical models
Volcanoes are mainly related to plate boundaries but can also be found at intraplate settings related to mantle hot spots. Moreover, volcanoes can be located on land or in the ocean, i.e., coastal and ocean island volcanoes (oceanic volcanoes). Beyond the primary hazards commonly associated with …
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