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Dissolved gases in hydrothermal (phreatic) and geyser eruptions at Yellowstone National Park, USA
Geology, 2016Multiphase and multicomponent fluid flow in the shallow continental crust plays a significant role in a variety of processes over a broad range of temperatures and pressures. The presence of dissolved gases in aqueous fluids reduces the liquid stability field toward lower temperatures and enhances the explosivity potential with respect to pure water ...
Shaul Hurwitz +5 more
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Experimental modelling of fragmentation processes within phreatic and hydrothermal eruptions
2012Phreatic and hydrothermal eruptions often occur with little or no warning representing a significant hazard within geothermal regions. These violent eruptions occur at a range of temperatures and pressures within varying rock types. A range of mechanisms including heating or decompression, allows hydrothermal/supercritical fluid to rapidly flash to ...
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Pyroclastic density current from the 1888 phreatic eruption of Bandai volcano, NE Japan
Journal of Volcanology and Geothermal Research, 1999Abstract The great eruption of July 15, 1888 at Bandai volcano produced large phreatic explosions and a major debris avalanche toward the northern foot. This eruption is characterized as follows: (1) there was no significant precursor; (2) the eruption and collapse of the volcanic edifice were triggered by an earthquake with a magnitude of about 5 ...
Takahiro Yamamoto +2 more
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Three-dimensional, multiphase flow numerical models of phreatic volcanic eruptions.
Explosive volcanic eruptions are characterized by the ejection in the atmosphere of volcanic gases and fragments of magma and/or lithics at high temperature, pressure and velocity. They encompass a broad range of magnitudes, with volumes of ejecta spanning from less than 106 m3, to 109-1011 m3 of Plinian eruptions, up to the largest known volcanic ...Tomaso Esposti Ongaro +1 more
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Phreatic eruptions and the influence of hydrothermal alteration on their processes
2016Phreatic eruptions are possibly the most drastic surface expressions of hydrothermal activity within active epithermal systems (geothermal fields), and they are still poorly understood. Various phenomena, such as fumaroles, hot springs, mud pools, and soil encrustations represent further obvious features of the interaction between outgassing ...
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