10:45 AM - 11:00 AM
[SVC45-01] Phreatic & hydrothermal eruptions: Insights into energy budget and eruption dynamics based on laboratory experiments.
Keywords:phreatic , hydrothermal , energy budget, eruption dynamics, experimental volcanology
Here we present conclusions from several case-studies, representing weak and violent eruption behavior. Further we give insights into the effect of host rock lithology and alteration on the eruption likelihood and dynamics.
Field studies revealed insights into the eruption dynamics, for instance based on detailed mapping of the deposits and or the ballistic strew field of a hydrothermal eruption. The main lithology types identified for an eruption were characterized for their petrophysical properties and degree of alteration. Then these lithology types were used for rapid decompression experiments mimicking hydrothermal explosions under realistic P-T conditions (from 110 °C & 0.3 MPa up to 400°C & 25 MPa). Experimental studies of this kind facilitate better constraints on the eruption dynamics as for instance the ejection of ballistics or amount of ash produced and their associated hazard. Furthermore they shed light on the energy conversion and partitioning during hydrothermal explosions.