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 15 of 15 for “"explosive volcanism"”.
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Explosive Volcanism in the Kenyan Rift: A Tephrostratigraphic Perspective
… to establish more comprehensive records of volcanism. In this study, two ~Holocene sediment core sequences, Lake Chala (Tanzania) and Lake Naivasha (Kenya), are investigated for the presence of cryptotephra deposits to provide better constraints on eruption histories. The complete Holocene …
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Deep explosive volcanism on the Gakkel Ridge and seismological constraints on shallow recharge at TAG active mound
… generation, are consistent with having formed by explosive discharge of magma and CO2 from source vents. Microearthquakes recorded on a 200 m aperture seismometer network deployed on the Trans-Atlantic Geotraverse active mound, a seafloor massive sulfide on the Mid-Atlantic Ridge at 26°N, are used …
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Deep explosive volcanism on the Gakkel Ridge and seismological constraints on Shallow Recharge at TAG Active Mound
… generation, are consistent with having formed by explosive discharge of magma and CO² from source vents. Microearthquakes recorded on a 200 m aperture seismometer network deployed on the Trans-Atlantic Geotraverse active mound, a seafloor massive sulfide on the Mid-Atlantic Ridge at 26°N, are used …
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Stratigraphic and Geochemical Insights into Explosive Volcanism in Northwestern Nicaragua: Case Studies from the Momotombo-Monte Galán Volcanic System and Cosigüina Volcano
… volcanoes provide, they can also destroy. An explosive eruption can obliterate a landscape in minutes, erasing structures and lives. Much progress has been made in understanding and monitoring hazardous volcanoes since the fateful eruption of Vesuvius in 79 A.D. famously destroyed Pompeii, but …
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Planet Mercury: volatile release on a contracting world
… pits and deposits thought to be the products of explosive volcanism. For hollows, I seek to clarify the nature of the substance lost to form them and the mechanisms by which this has been introduced to, and lost from, the surface recently enough to explain their pristine appearance. I produce a …
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Recent extreme events in a tropical stalagmite: Multi-proxy records and analysis of ecosystem delta carbon-13 value sensitivity to weak climate forcing
… extremes, such as tropical cyclones, explosive volcanism, and enhanced seasonal contrasts from speleothems that are sensitive to transient infiltration events through very high-resolution, multi-parameter analysis of a rapidly growing, fracture-fed tropical stalagmite. A series of …
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Volcanic reconstruction of the paleoproterozoic powderhouse formation, Snow Lake, Manitoba, Canada: implications for controls on volcanogenic massive sulfide formation
… dome eruption, VMS formation, and a hiatus in explosive volcanism.
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Data-driven approaches towards understanding trace metal and magmatic processes in arc volcanoes, with applications to Java, Indonesia
… margins like subduction zones (or "arcs"), where explosive volcanism is more common. The aforementioned social and economic pressures will necessitate a move towards "greener" economies, invariably leading to increased competition for natural mineral resources. While much progress has been made in …
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Resolving abrupt palaeoenvironmental changes in a lake sediment sequence from Ioannina, northwest Greece
… analysis identifies deposits associated with explosive volcanism at Italian volcanic sources, including Campi Flegrei, Pantelleria, and the Aeolian islands for the first time at Ioannina. Two visible tephra layers, the Campanian Ignimbrite (CI/Y-5; ca. 39.8 ka BP) and Pantelleria Green Tuff …
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
… metal transport in the atmosphere during explosive volcanism, using ice core records of the massive halogen-rich ~17.7 ka eruptions of Mt. Takahe, an alkaline volcano on the West Antarctic Rift System. I suggest that the residence time of metals in the atmosphere may be limited by their …
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Centennial-scale reconstructions of mountain glacier fluctuations during the Holocene, West Greenland
… multidecadal periods of low solar activity or explosive volcanism; thus, it is possible that multidecadal variations of solar and volcanic activity, supported by positive feedbacks in the climate system, played a critical role in late Holocene alpine glaciation in West Greenland. Finally, …
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Studies on late Quaternary tephras in the Waikato and other regions in northern North Island, New Zealand, based on distal deposits in lake sediments and peats
… sources to be elucidated, and a record of explosive volcanism to be documented. Forty-one distal tephras of rhyolitic or andesitic composition have been deposited in lakes in the Waikato area over the past c.17 000 years. The tephras originated from six volcanic centres and are identified …
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Investigating Palaeoatmospheric Composition-Climate Interactions
… This could have caused episodes of paced explosive volcanism, injecting sulfate aerosol precursors into the stratosphere. Results of simulations to investigate the impact of different volcanic aerosol emission scenarios are presented. 500 Tg SO2 is investigated with a range of aerosol …
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Deciphering the thermal evolution of small planetary bodies.
… from low temperature aqueous alteration, to explosive volcanism. However, determining certain properties of these asteroid-sized bodies such as their size and structure can be difficult. In this thesis, I use detailed models of planetesimal thermal evolution to constrain the accretionary …