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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 142-161 of 164
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(University of Oregon, 2024-08-07)The evolution of mammalian biodiversity is a complicated process with many complex drivers and mechanisms. It has been a topic of unique interest for several centuries and has been explored from multiple angles. Frequently, ...
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(University of Oregon, 2020-12-08)Interpreting volcanic behavior is challenging because the phenomena controlling volcano eruptibility occur at substantial crustal depths. However, volcanic gases are a measurable surface expression of subterranean magmatic ...
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(University of Oregon, 2021-11-23)The Miocene Grey’s Landing ignimbrite is a large (≥ 23,000 cubic km), intensely welded, highly rheomorphic extremely high-grade ignimbrite. The cause of rheomorphism can be attributed to syn-depositional strain heating and ...
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(University of Oregon, 2020-12-08)The Miocene to post-Miocene geologic history of Northeastern Oregon and West-Central Idaho is difficult to parse because this area has experienced several dramatic events. Within 35 km of each other, there are exposures ...
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(University of Oregon, 2019-01-11)Many estuaries have large variability in salinity structure due to variable river discharge, having the potential to induce large seasonal changes in estuarine exchange flow. In this study, a numerical ocean model of the ...
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The Evolution of Cranial Modularity and Integration in the Caviomorpha Lineage (Mammalia, Rodentia) (University of Oregon, 2018-04-10)Caviomorph rodents arrived from Africa as sweepstakes colonists to the South American island continent between 54 and 37 Ma, and subsequently underwent a rapid and widespread adaptive radiation beginning in the middle ...
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(University of Oregon, 2022-10-04)Constraint is a fundamental concept in evolutionary theory. The possibilities are not endless for what shape an organism can take, nor ecology of one generation to the next. Cat-like carnivorans (Feliformia) offer a unique ...
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(University of Oregon, 2021-04-27)In this dissertation, I analyze the relationship between magmatic structures in the upper- to mid-crust and overlying surface topography. Beginning with a theoretical approach, I examine the impact of localized uplift ...
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(University of Oregon, 2022-10-26)The goal of my dissertation is to broadly investigate source and surface processes on faults hosting creep and slow fault slip. The discovery of different modalities of slip has proven to be ubiquitous across faults in ...
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(University of Oregon, 2024-01-10)Seals, sea lions, walruses, and their extinct relatives and ancestors have played a critical role in marine ecosystems for over 25 million years. Known collectively as pinnipeds, these secondarily aquatic animals are unique ...
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(University of Oregon, 2019-04-30)Low frequency earthquakes (LFEs) are detected at depths of 16-30 km on a 150 km section of the San Andreas Fault (SAF) centered at Parkfield, CA. The LFEs are divided into 88 families based on waveform similarity. In ...
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(University of Oregon, 2011-06)An extensive area west of the Three Sisters volcanoes of Oregon has been actively uplifting for over a decade. Examining the deformation is imperative to improve understanding of the potential hazards of Cascade volcanism ...
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(University of Oregon, 2017-09-06)Magmas experiencing pressure changes can follow equilibrium or nonequilibrium degassing paths that determine the rate of gas exsolution and the composition of gases exsolved. Many variables influence timescales of equilibration ...
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(University of Oregon, 2020-12-08)DISSERTATION ABSTRACT Marisa Dawn Acosta Doctor of Philosophy Department of Earth Sciences September 2020 Title: Titanium in quartz during growth and deformation under hydrothermal-magmatic conditions Titanium in ...
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(University of Oregon, 2020-02-27)In this dissertation, I use isotopes of H, O and Sr to trace interaction between meteoric waters, seawater and rocks in modern and extinct areas of high-temperature hydrothermal alteration. The ancient hydrothermal systems ...
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(University of Oregon, 2022-02-18)The goal of my dissertation is to expand our knowledge of how mammalian diets are affected by and affect other ecological and evolutionary processes. I did this by evaluating how diet is related to mammalian diversity, ...
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(University of Oregon, 2021-09-13)Preliminary analysis of the ground-motions from the shallow M6.6 reverse-slip earthquake that struck the island of Crete on May 2nd, 2020, 12:51 UTC, indicates low shaking for the earthquake’s magnitude. Such behavior is ...
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(University of Oregon, 2018-09-06)The last several years have seen renewed interest in the origin of silicic magmas thanks to the developments of new microanalytical techniques allowing the measurement of the isotopic and trace element compositions of ...
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(University of Oregon, 2011-06)The upper-crustal seismic-velocity structure of Newberry volcano, central Oregon, is imaged using P-wave travel time tomography. The inversion combines a densely-spaced seismic line collected in 2008 with two USGS seismic ...
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(University of Oregon, 2024-01-09)Landslides are difficult to predict due to the influence of variable geologic and environmental factors, such as geomechanical properties, rainfall, ground saturation, topography, and earthquakes, exert on the probability ...
Now showing items 142-161 of 164