2-2-2-2-2-2-2-2-2-2-2-2-2 From: "Van Eaton, Alexa R" <avaneaton@xxxxxxxx> Dear colleagues, As the extended deadline for IAVCEI abstract nears (Sept 9), we would like to draw your attention to the following special session: *Unravelling the mystery of the 2021â??2022 eruption of Hunga volcano, Tonga* The 15 January 2022 explosion from Hunga volcano in Tonga was an eruption of superlatives. It generated the highest plume ever observed, the fastest-growing umbrella cloud, the most intense lightning, and acoustic waves that encircled the globe several times, inducing tsunami in distal oceans. This extraordinary event originated from a poorly known, andesitic volcano mostly submerged beneath the Pacific. The eruption started off modestly in Dec 2021, and there few warning signs that the shift to more intense behaviour on 13 Jan 2022 would be closely followed by the catastrophic event on 15 Jan. Many questions remain unanswered. How and why did the magmatic system undergo this step change? How much tephra, magmatic gas, and seawater was involved? What subaerial and submarine processes led to development of the unusually high plume and widespread turbidity currents? New conceptual models may be required to explain the magma assembly, eruption dynamics, and long-distance transport of pyroclasts and gas from this water-rich eruption. We invite contributions covering any aspect of this eruption, including, but not limited to: - Observations of the eruptive processes and their impacts - Modelling of magmatic processes and intensive parameters (P-T-X) - Microanalytical investigation of glass and crystals to define melt affinities, diffusive timescales and melt volatile content - Textural studies of deposits to determine transport and fragmentation mechanisms - Modelling of magma-water interaction, plume development, and dispersal - Transport of volcanic gases (SO2, sulfate aerosol, H2O) and atmospheric effects - Observations and modelling of turbidity currents, tsunamis, and impacts - Short and long-term effects on communities and the biosphere Abstract submissions: https://urldefense.com/v3/__https://confer.eventsair.com/iavcei2023/call-for-abstracts__;!!IKRxdwAv5BmarQ!ewN9FpddmA3TxOYhcbgyqSdR54E8Foq7myQzV1jF-TOXEqaviEKY7s7fQe9NTzH674_CyrRX758jg2Ef$ <https://urldefense.com/v3/__https://confer.eventsair.com/iavcei2023/call-for-abstracts__;!!IKRxdwAv5BmarQ!b_gZzJCKjU4p0h04J0oVsN2Z-ejRTJGX3MVn7j3aO2_qfpIL4DKyLLK5J8-iy_KedRIk_NgW-QA7qadpdhQ$> Many thanks on behalf of the conveners: Marco Brenna, University of Otago Joa Paredes-Mariño, University of Auckland Simon Barker, Victoria University of Wellington Alexa Van Eaton, U.S. Geological Survey 2-2-2-2-2-2-2-2-2-2-2-2-2 ------------------------------
