3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3 From: Daniele Andronico <daniele.andronico@xxxxxxx> 3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3 Dear All, We would like to draw your attention to the session â??V02 â?? When magma meets water: understanding the trigger, the dynamics and the deposits of phreatomagmatic eruptions to better quantify the associated hazardâ?? proposed in the context of the 27th IUGG General Assembly, which will be held on July 8-18, 2019 at the Palais des Congrès in Montréal, Québec, Canada (http://iugg2019montreal.com/abstract-submission.html). This session is focused on the interaction between magmatic gas and magma which, in different ambient conditions, may generate phreatomagmatic explosions, in some cases unexpected and therefore posing high risks to people close to the vent areas. The deadline for the abstract submission is *February 18, 2019*. Hoping the initiative will meet your favor, we look forward to receiving your contribution. Sincerely yours, Daniele and Mattia *V02 â?? When magma meets water: understanding the trigger, the dynamics and the deposits of phreatomagmatic eruptions to better quantify the associated hazard* The interaction of magmatic gas and magma (fuel) with water (coolant) may generate phreatomagmatic explosions, among the most hazardous volcanic phenomena. They can precede magmatic activity or evolve into long-lasting eruptions, producing abundant tephra ranging in size from ash to bombs/blocks, which sometimes generate volcanic â??structuresâ?? like maars, tuff cones, and tephra rings. The intensity of this interaction is thought due to external water availability together with efficiency and rate of the heat/energy transfer, which may occur both within the volcanic conduit and outside the eruption vent. However, short-lived, impulsive explosive events related to phreatomagmatic activity may pose higher hazards than prolonged eruptions, directly threatening people close to the vent areas and potentially causing large injuries and casualties. In this symposium, we explore phreatomagmatic events which result in short-sequences of closely-space explosions and produce an unexpected ejection of fine- to coarse-grained products. Furthermore, in view of recent events which have taken places in extreme environments (such as Iceland and Kamchatka) or in the upper slopes of volcanoes such as Etna, we encourage contributes describing the behavior of lava in presence of ice/snow cover. In particular, we look at the ambient conditions promoting the explosive lava-snow/ice interaction, like lava thickness, effusion rate, thickness of the snow/ice layer and its type (dry/wet/porous) and temperature (close to or much lower than 0 °C). Understanding the mechanisms and physical parameters leading to the generation of steam that expand explosively under an active lava flow or within a volcanic conduit, is a crucial step for reducing the risks to volcanologists in charge of the monitoring, but especially tourists that visit the summit of volcanoes, keeping them at proper safety distances. Conveners: Daniele Andronico (Italy), M. de' Michieli Vitturi (Italy) ============================================================== Volcano Listserv is a collaborative venture among Arizona State University (ASU), Portland State University (PSU), the Global Volcanism Program (GVP) of the Smithsonian Institution's National Museum of Natural History, and the International Association for Volcanology and Chemistry of the Earth's Interior (IAVCEI). ASU - http://www.asu.edu/ PSU - http://pdx.edu/ GVP - http://www.volcano.si.edu/ IAVCEI - http://www.iavcei.org/ To unsubscribe from the volcano list, send the message: signoff volcano to: listserv@xxxxxxx, or write to: volcano-request@xxxxxxx. To contribute to the volcano list, send your message to: volcano@xxxxxxx. Please do not send attachments. ============================================================== ------------------------------
