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 316 for “"Eruption"”.
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Near-vent processes of the 273 ka Poris eruption (Tenerife)
… processes during caldera-forming explosive eruptions are poorly known, as are relations between proximal and counterpart distal ignimbrites. Consequently, understanding of the full course of these eruptions and how to analyse their deposits for purposes of hazard assessment has been limited. …
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Long-range impacts of the ~74 ka Toba super eruption
The ~74 ka Toba super eruption (Indonesia) was the largest Quaternary volcanic event and, thus, has been a topic of debate regarding its possible impact on climate, environment, and eventually, early modern humans. This dissertation was aimed at improving our understanding of the Toba impact by …
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Radiative Forcing and Climatic Impact of the Mount Pinatubo Volcanic Eruption
Changes in radiative fluxes and atmospheric heating rates were computed by using the UIUC 24-layer Stratosphere/Troposphere General Circulation Model (ST-GCM) and a reconstructed dataset of the Pinatubo aerosol optical properties. Composite and the Singular Value Decomposition (SVD) analyses were …
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Volcanic deformation as an indicator of mechanical stability and eruption susceptibility
Caldera-forming eruptions are amongst the greatest natural hazards on our planet, erupting hundreds of cubic kilometers of material with severe local and global impacts that pose great risks to human health and society at large. Understanding how these systems form and what triggers their …
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An interdisciplinary approach toward improving volcanic flank eruption threat assessment and hazard communication
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Reproductive traits of pioneer gastropod species colonizing deep-sea hydrothermal vents after an eruption
… tevnianus, presented itself in 2006 after an eruption on the East Pacific Rise (EPR) eliminated vent communities near 9°50ʹ′N. Standard histological techniques were used to determine whether reproductive characteristics, such as timing of gamete release, fecundity, or time to maturation, …
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The consequences of gas slug ascent in a stratified magma on Strombolian eruption dynamics
… this scenario into current models of volcanic eruptions and interpretation of geophysical signals. This study investigates slug ascent through a rheologically stratified magma column using analogue laboratory experiments, numerical modelling and 3D computational fluid dynamic simulations. The …
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Reproductive traits of pioneer gastropod species colonizing deep-see hydrothermal vents after an eruption
… tevnianus, presented itself in 2006 after an eruption on the East Pacific Rise (EPR) eliminated vent communities near 9°50'N. Standard histological techniques were used to determine whether reproductive characteristics, such as timing of gamete release, fecundity, or time to maturation, …
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Automated Mapping of Lava: Classification of the Lava Flow Field from the 2021 Fagradalsfjall Eruption
In March 2021 an effusive eruption began in the Fagradalsfjall volcanic system in Iceland. It was the first in a new series of volcanic events on the Reykjanes Peninsula that threaten communities and infrastructure in the area. Near real-time mapping of the lava flow field is essential for hazard …
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Prelude to the Tshirege caldera-forming eruption of the Bandelier magmatic system, New Mexico, USA
Two caldera-forming eruptions have occurred in the Bandelier magmatic system of the Jemez Mountains of northern New Mexico, the latter of which formed Valles caldera during the Tshirege eruption at 1232 ka. Despite no eruptions at Valles in the last ca. 70 kyr, the presence of partially molten …
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Zircon crystallization patterns from U-Th dates inform U-Pb estimates of volcanic eruption ages
… between zircon crystallization and volcanic eruption. We use published U-Th disequilibrium dates representing 137 zircon samples with ages <350 ka and maximum likelihood estimation to develop a clearer picture of zircon crystallization and estimate the gap, if one exists, between the …
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INSIGHTS INTO ERUPTION DYNAMICS AND SHALLOW PLUMBING SYSTEM OF MT. ETNA BY INFRASOUND AND SEISMIC SIGNALS
The success in eruption forecasting needs the knowledge of the eruptive processes and the plumbing system of the volcano. Indeed, the eruptive styles are controlled by the interplay between magma dynamics and the plumbing system. In multi-vent volcanoes, such as Mt. Etna, where volcanic activity …
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Characterization of volcanic ash from 2010 Mt Merapi, Indonesia eruption by neutron activation analysis and leaching analysis
… present in fresh volcanic ash from a 2010 eruption in Indonesia using varied instrumental neutron activation analysis techniques. The ash was then leached into slightly acidic distilled water meant to simulate rainwater. This thesis focuses both on the methods used to identify the elements …
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Commonalities in the emplacement of cooling-limited lavas : insights from the 2011-2012 Cordón Caulle rhyolitic eruption
… well studied, the infrequency of silicic eruptions has limited our understanding of the emplacement of high-viscosity rhyolitic lavas. The 2011-2012 eruption of Puyehue-Cordón Caulle in southern Chile provided a unique opportunity to make scientific observations of an active rhyolitic lava …
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