Analogue experiments of volcanic explosion focusing on pressure release processes

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When analyzing volcanic explosion we often suppose the instantaneous release of pressurized gas and ignore gas species. Our laboratory experiments have revealed that even if total released energy is the same the resultant phenomena differs depending on gas release rate and thermodynamic properties of volcanic gas.We also observed the activity of Villarrica volcano, Chile. We did not catch air wave accompanying explosions but detected stable monochromatic infrasound. Using this we determined the shape of the cavity in the vent.