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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 106-125 of 164
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(University of Oregon, 2015-01-14)Using joint P-wave seismic tomography, receiver functions, and ambient noise we image the magmatic structure beneath Newberry Volcano, located near Bend, Oregon. Use of active source and teleseismic events in a joint ...
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(University of Oregon, 2019-01-11)In this dissertation, I use seismic imaging methods to constrain the evolution of the oceanic upper mantle across the Juan de Fuca (JdF) and Gorda plates. This work begins by studying the geometry of the mantle magmatic ...
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(University of Oregon, 2019-04-30)In this dissertation, I use seismic imaging and waveform modeling methods to investigate melt migration processes and the structure of the magma plumbing system beneath the East Pacific Rise (EPR) and Endeavour segment of ...
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(University of Oregon, 2014-09-29)Newts, abundant worldwide, have unclear pre-Pliocene evolution and phylogenetic relationships. North America has a sporadic pre-Pliocene newt record. Several undescribed fossils can address this lack of information. I ...
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(University of Oregon, 2014-06-17)H2O and CO2 concentrations in olivine-hosted melt inclusions, assuming vapor saturation at the time of trapping, can be used to estimate crystallization depths for the olivine host. Estimating the true CO2 in melt inclusions ...
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(University of Oregon, 2020-02-27)We use a dense network of observations and an automated method of analysis to investigate complex patterns of seismic anisotropy in eastern Oregon. We present SKS splitting results for approximately 220 broadband seismic ...
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(University of Oregon, 2016-10-27)Knowledge of the isotopic evolution of volcanic eruptions is essential to volcanologists, geochemists, and paleoclimatologists. I isotopically evaluate the evolution of magmas from their initial formation, to eruption, and ...
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(University of Oregon, 2013-10-10)The middle Miocene thermal maximum (~16 Ma) was a period of global climate unusually warm and wet for the Neogene and is of interest as a paleo-analog for future climate change from anthropogenic global warming. In ...
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(University of Oregon, 1964)Many post-middle Oligocene bodies of intrusive rocks are located in the southern Willamette Valley near Eugene, Oregon. Six of these which fora topographic highs, Creswell Butte, Spencer Butte, East Butte, Skinner ...
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(University of Oregon, 2012)Cinder Cone is the most recent cinder cone eruption in the continental United States at ~350 years old. This study examines the physical characteristics of the explosive deposit of the volcano in order to infer eruption ...
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(University of Oregon, 2012)Long-lived and short-lived volcanic vents often form in close proximity to one another. However, the processes that distinguish between these volcano types remain unknown. Here, I investigate the differences of long-lived ...
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(University of Oregon, 2013-10-03)The focus of this research is to characterize the risk of carbon sequestration under downhole conditions with regards to wellbore cement integrity. The primary research objective was to understand the geochemical interactions ...
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(University of Oregon, 2016-02-23)Accurate sediment flux histories are critical data for deciphering the relative importance of climate and land use factors such as logging and road construction on sediment production and deposition. We use 210Pb activities ...
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(University of Oregon, 2022-02-18)Billions of people live in the shadow of a volcano. Explosive eruptions produce myriad hazards, saturating airways with noxious gases and volcanic particles that damage infrastructure and crops. Above all, these eruptions ...
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(University of Oregon, 2020-12-08)Ice streams transport the majority of the ice lost to the ocean from the Antarctic Ice Sheet. In many cases these fast-flowing streams are bordered by nearly stagnant ice ridges that supply cold ice through lateral advection. ...
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(University of Oregon, 2012)Mafic eruptions have been the dominant form of volcanic activity in central Oregon throughout the Holocene. These eruptions have produced cinder cones, extensive lava flows, and tephra blankets. In most cases, the extent ...
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(University of Oregon, 2015-08-18)Melt inclusions record valuable information about pre-eruptive melt volatile concentrations. However, a vapor bubble commonly forms in inclusions after trapping, and this decreases the dissolved CO2 concentration in the ...
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(University of Oregon, 2014-09-29)Lava flows are common at volcanoes around the world and on other terrestrial planets, but their behavior is not fully understood. In Hawai`i, advances in remote sensing are offering new insights into lava flow emplacement. ...
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(University of Oregon, 2012)Cenozoic tectonics of the Pacific Northwest (PNW) and the associated mantle structures are remarkable, the latter revealed by EarthScope seismic data. In this thesis we model teleseismic body waves constrained by ambient-noise ...
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(University of Oregon, 2012)In many mountainous settings, landslides are the primary geomorphic agent that sets fundamental landscape characteristics, such as topographic relief and catchment-averaged erosion rate. The coupled system of landslides ...
Now showing items 106-125 of 164