THE IMPACTS OF LOCAL STRESS FIELDS AND HOST ROCK HETEROGENEITY ON MAGMA TRANSPORT AND EXTRUSION AT STRATOVOLCANOES
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Within the edifice and upper several kilometers of the basement, the shallow plumbing systems of stratovolcanoes supplies magma to vents both at their summits and on their flanks. Flank eruptions pose a significant hazard due to uncertainties linked with new vent locations and their potentially close proximity to, or even within, inhabited areas. Emplacement models for eruption feeder dikes rely on indirect observations at several highly active and well-studied mafic volcanoes. It remains unclear how well these models explain long-term volcanic behaviors or the transport of more evolved magmas. This dissertation investigates the Oligocene age Summer Coon volcano (Colorado, USA) through field-based methods to infer the parameters the govern magma transport and eruption at stratovolcanoes.