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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 85-104 of 164
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(University of Oregon, 2023-03-24)This dissertation summarizes the work of integrating machine-learning and traditional seismic analysis techniques into large and small earthquake problems. Earthquake early warning for large magnitude earthquakes is one ...
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(University of Oregon, 2019-09-18)Despite multidisciplinary evidence for crustal magma accumulation below Santorini Volcano, the structure of the shallow magmatic system remains elusive. We use tomographic inversions of P-wave, active-source seismic data ...
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(University of Oregon, 2011-03)Volatile components (H 2 O, CO 2 , S, Cl) dissolved in magmas influence all aspects of volcanic activity from magma formation to eruption explosivity. Understanding the behavior of volatiles is critical for both mitigating ...
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(University of Oregon, 2021-04-27)Rice contamination by arsenic and cadmium is a well-documented challenge that impact billions of people globally. Our goal is to quantify the extent to which magnetite and manganese dioxide could be used as rice paddy ...
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(University of Oregon, 2017-09-27)It is clear that ecosystems are devastated after a volcanic eruption coats the landscape with a layer of ash; however, the ecological recovery of mammalian communities after eruptions is poorly understood. Volcanic eruptions ...
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(University of Oregon, 2017-09-06)In this dissertation, I use seismic imaging techniques to constrain the physical state of the upper mantle beneath regions of young oceanic lithosphere. Mantle convection is investigated beneath the Galápagos Archipelago ...
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(University of Oregon, 2012)Primitive, mantle-derived magmas provide important clues about the formation and equilibration conditions of magmas at depth. In subduction zones, it is uncommon for primitive magmas to ascend through the shallow mantle ...
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(University of Oregon, 2024-08-07)Rockfall is a common occurrence in steep mountainous terrain which poses a hazard to nearby communities. It is useful to determine the likelihood of rockfall initiating from a given location, or rockfall susceptibility, ...
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(University of Oregon, 2018-04-10)Magma chambers are a fundamental component of crustal magma transport modulating erupted volumes, compositions, and timing of eruptions. However, we understand little about how eruption episodicity relates to magma chamber ...
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(University of Oregon, 2024-08-07)The planet Venus appears to be the only geologically active planet in the solar system at present, aside from Earth. This long-sustained activity is reflected by globally distributed tectonic and volcanic features and ...
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(University of Oregon, 2010-03)Excess melt production due to the interaction between the northern Mid-Atlantic Ridge and the Iceland mantle plume generates anomalously thick oceanic crust. Observed V-shaped gravity anomalies on the Reykjanes Ridge ...
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(University of Oregon, 2015-08-18)Geomicrobial metabolic rates, the speed at which microbes interact and metabolize available substrates from their surroundings, are important parameters in geochemistry and biogeochemistry. Here, I present a new modeling ...
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(University of Oregon, 2009-06)This dissertation explores several important consequences of H 2 O-rich fluids in magmatic and ore-forming systems within continental arc crust. North Sister, a stratovolcano in the Oregon High Cascades, provides a ...
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(University of Oregon, 2012)Subglacial processes that control the water pressure and flow determine the large-scale behavior of the overlying ice by regulating basal resistance. We implement a model in which a steady-state subglacial conduit system ...
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(University of Oregon, 2017-09-06)Meltwater accumulated on the Greenland Ice Sheet drains to glacier beds, discharging into fjords hundreds of meters below sea level. The injection of meltwater at depth generates an upwelling plume that entrains warm ocean ...
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(University of Oregon, 2024-08-07)This dissertation investigates different approaches for improving modeling ofearthquake ground motion by focusing efforts on the different physical properties which are traditionally thought to contribute to shaking–– the ...
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(University of Oregon, 2015-08-18)Slow slip and tectonic tremor in subduction zones take place at depths (~20 - 50 km) where there is abundant evidence for distributed shear over broad zones (~10 - 10^3 m) composed of rocks with marked differences in ...
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(University of Oregon, 2015-08-18)Porous media affect hydrate stability by forcing hydrate-liquid interfaces to form high curvature geometries and by forcing the molecules of the hydrate, liquid, and sedimentary particles that compose the medium to interact ...
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Modelling Fluid Resonance in Conduit-Crack Coupled Systems: An Application to Englacial Geometries (University of Oregon, 2020-09-24)Englacial structures are an integral part of the glacial hydrological system, yet the internal structure of ice sheets and glaciers remain largely unknown. Resonance of fluids in cracks and conduits has been widely leveraged ...
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(University of Oregon, 2010-03)Deformation across plate boundaries often occurs over broad zones with relative motions between plates typically accommodated by faults of different styles acting together in a complex system. Collision of the Yakutat ...
Now showing items 85-104 of 164