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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 26-45 of 164
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(University of Oregon, 2015-08-18)Reaches dominated by debris flow scour and incision tend to greatly influence landscape form in steepland basins. Debris flow networks, despite their ubiquity, have not been exploited to develop erosion rate proxies. To ...
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(University of Oregon, 2020-09-24)Empirical thresholds for landslide warning systems have benefitted from the incorporation of soil-hydrologic monitoring data, but the mechanistic basis for their predictive capabilities is limited. Although physics-based ...
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(University of Oregon, 2007-12)Klyuchevskoy volcano, located in Kamchatka's subduction zone, is one of the most active arc volcanoes in the world and contains some of the highest 8180 values for olivines and basalts. I present an oxygen isotope and melt ...
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(University of Oregon, 2023-03-24)The arc-continent collision system has been considered as a primary mechanism in the growth of continental crust, which involves development of both rising eroding mountains and subsiding syn-orogenic basins. However, the ...
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(University of Oregon, 2012)Convergent plate boundaries evolve through the dynamic interaction between subducting oceanic lithosphere, overriding lithosphere, and adjacent flow of the convective mantle. These lithospheric plates contain remarkable ...
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(University of Oregon, 2009-09)This dissertation establishes the age, depositional environment, composition, and climatic conditions for the Cape Blanco flora. The paleotemperature estimated by the Cape Blanco flora, the Temblor flora of California, and ...
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(University of Oregon, 2018-04-10)The Eel River watershed has a high concentration of slow-moving landslides, or earthflows, due to argillaceous mélange bedrock and high tectonic uplift. Earthflows within this area are highly dissected by ephemeral channels, ...
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Effects of noise on teleseismic T* estimation and attenuation tomography of the Yellowstone region (University of Oregon, 2009-06)Studies on seismic attenuation are an important complement to those on seismic velocity, especially when interpreting results in terms of temperature. But estimation of attenuation (t*) is more computationally involved and ...
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(University of Oregon, 2011-06)Results from a recent mid-ocean ridge tomography study along the fast-spreading, northern East Pacific Rise (EPR) reveal that the axis of mantle upwelling beneath the ridge is skewed with respect to the spreading axis, ...
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(University of Oregon, 2011-09)Mafic arc volcanoes have eruption styles that range from explosive to effusive. In a broad sense, eruption style is controlled by the rate of magma supply to the vent. In this dissertation I examine relationships between ...
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(University of Oregon, 2011-12)Uplift rates associated with 12 episodic tremor and slip events on the Cascadia Subduction Zone occurring between 1997 and 2010 have been determined from hourly water level records from 4 NOAA tide gauges (Neah Bay, Port ...
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(University of Oregon, 2021-04-27)Landscapes evolve through the contributions of uplift and erosion over myriad spatiotemporal scales. Over long timescales (>103 yr), tectonics and climate set landscape and drainage basin form. Over societally relevant ...
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(University of Oregon, 2014-10-17)Fault strength is of key importance to geological and geophysical processes over a vast range of scales, from the microscopic interactions at asperities to the macroscopic behavior of plates. In this dissertation, I present ...
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(University of Oregon, 2013-10-03)Four groups of equids, "Anchitheriinae," Merychippine-grade Equinae, Hipparionini, and Equini, coexisted in the middle Miocene, and only the Equini remains after 16 million years of evolution and extinction. Each group is ...
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(University of Oregon, 2013-10-10)We investigate the evolution of the regional stress state near the Pit River, northern California, in order to understand the faulting style in a tectonic transition zone and to inform the hazard analysis of Fault 3432 ...
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(University of Oregon, 2008-09)SAR data constrain deformation of the Portuguese Bend landslide in space and time, and its movement is found to correlate with seasonal rainfall. Traditional InSAR methods estimate an average downslope displacement rate ...
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(University of Oregon, 2012)The hydrogen and oxygen isotope ratios in hydrous minerals and volcanic glass are used as paleo-proxies to infer isotopic values of meteoric waters and thus paleo-climate conditions. Long-term exposure experiments with Mt ...
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(University of Oregon, 2021-04-27)Subaqueous eruptions are often overlooked in hazard considerations though they represent significant hazards to shipping, coastlines, and in some cases, aircraft. In explosive subaqueous eruptions, volcanic jets transport ...
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(University of Oregon, 2009-09)I present an alternative approach to determine the magnitude and direction of extension in the Basin and Range Province at the north end of Summer Lake basin using GIS techniques. Offset across 161 faults and tilting of ...
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(University of Oregon, 2015-08-18)Volatiles (H2O, CO2, S, Cl) play a key role in magmatic processes at subduction zones. In this study, the dissolved volatile contents of olivine-hosted melt inclusions from cinder cones in the Lassen segment of the Cascade ...
Now showing items 26-45 of 164