2-2-2-2-2-2-2-2-2-2-2-2-2 From: "Montanaro, Cristian" <cristian.montanaro@xxxxxxxxxxxxxxxxxxx> As the deadline for abstract submissions approaches on 2 September: https://urldefense.com/v3/__https://confer.eventsair.com/iavcei2023/call-for-abstracts__;!!IKRxdwAv5BmarQ!Zj0aCPfwDjFA7Tnz9evb3Teo_XCniSFXBxctQcbnIPek1-NLR6_QEU98MF7ds_EwVSXkgdSonBF73V1H$ <https://urldefense.com/v3/__https://confer.eventsair.com/iavcei2023/call-for-abstracts__;!!IKRxdwAv5BmarQ!cfarXcT-ZIV18Bj1BwFhtUefqOfGVKcT6l_i0LYQ22skIYERX1cMptdamC24A-2QmswGK3RcbIWjl_Dd2EAmhX8lTMCLNvGqD5Sw$> We would like to draw your attention to the following IAVCEI 2023 session: *Phreatic and hydrothermal eruptions: occurrence, triggers, magnitude, and hazards* convened by Dr. Cristian Montanaro, Prof. Bettina Scheu, Dr. Shaul Hurwitz, Dr. Arthur Jolly, Prof. Shane Cronin As part of the â??*Eruption triggers and styles: From precursors to eruption*â?? theme, our session aims to gather multidisciplinary contributions that will present and explore the current state of knowledge of mechanisms of (steam-driven) hydrothermal and phreatic eruptions triggering and precursory signals in volcanic and geothermal settings, as well as to discuss key challenges and future research directions. A full session description is provided online at: https://urldefense.com/v3/__https://confer.eventsair.com/iavcei2023/scientific-symposia__;!!IKRxdwAv5BmarQ!Zj0aCPfwDjFA7Tnz9evb3Teo_XCniSFXBxctQcbnIPek1-NLR6_QEU98MF7ds_EwVSXkgdSonKSgYF1Z$ <https://urldefense.com/v3/__https://confer.eventsair.com/iavcei2023/scientific-symposia__;!!IKRxdwAv5BmarQ!cfarXcT-ZIV18Bj1BwFhtUefqOfGVKcT6l_i0LYQ22skIYERX1cMptdamC24A-2QmswGK3RcbIWjl_Dd2EAmhX8lTMCLNj69zaNc$> And below. We hope to see you there!!! Many thanks, Cristian, Bettina, Shaul, Arthur, and Shane *Session description:* Steam-driven â??hydrothermal or phreaticâ?? eruptions occur frequently at active volcanoes, within geothermal areas and in rather pristine environments. Alteration of host-rocks can lead to significant changes in the physical properties of rocks (e.g. porosity, permeability strength). Pressure and temperature perturbations may result in the near-instantaneous vaporization of groundwater, or of pressurized hot fluids trapped in pores and cracks within the upper parts of shallow hydrothermal system. Decompression and flashing/expansion of fluids can blast rocks apart leading to mixed gas-liquid jets, pyroclastic density currents and lateral blasts, often accompanied by distal ballistic ejection. These eruptions pose serious threats in areas increasingly exploited for tourism and geothermal power generation, or for populated areas. Due to the complex and still largely unknown interaction of the magmatic and hydrothermal systems, steam-driven eruptions are yet unpredictable. The incomplete stratigraphic records, limited understanding of explosive failure processes and the lack of precursors in monitoring signals result in unreliable scientific models to forecast locations, triggering, and magnitude of such eruptions. This session invites contributions from a broad range of disciplines (field geology, geophysics, geochemistry, physical and numerical modelling and laboratory experiments) that can provide an improved understanding of mechanisms of steam-driven eruption triggering as well as precursory signals of this in hydrothermal aquifers. We aim to foster discussion on lessons learned from recent and past events, to summarize our current state of knowledge and discuss future research directions related to phreatic and hydrothermal eruptions. 2-2-2-2-2-2-2-2-2-2-2-2-2 ------------------------------
