5-5-5-5-5-5-5-5-5-5-5-5-5-5 From: Edna Warsame Dualeh <edna.dualeh@xxxxxxxxxxxxx> Dear Colleagues, COMET (The Centre for Observation and Modelling of Earthquakes, Volcanoes, and Tectonics) invites you to the next installment of our COMET webinar series, viewable from the home office. *Integrating measurements of deformation and degassing offers insights into magma compressibility and magmatic systems* *Wednesday 13th November 2024 at 4pm UK time* (4pm UTC/5pm CEST/8am PDT) *Dr Stanley Yip* *University of Leeds, UK* *Please register at: https://bristol-ac-uk.zoom.us/webinar/register/WN_DxXqtOBMSneFfY1MsLcF2Q <https://urldefense.com/v3/__https://bristol-ac-uk.zoom.us/webinar/register/WN_DxXqtOBMSneFfY1MsLcF2Q__;!!IKRxdwAv5BmarQ!eXIWze1m9VzJY6r1XWTSPRi_aI8AfXRZSxI4tGGSb1J0xWboDalkd_WZiC3j4szKNxUJyg1L_kiQhcxCzYGXkWZ0CA$>* (After registering, you will receive a confirmation email containing information on how to join the webinar) *Abstract:* Integrating multi-parameter observations of volcanic eruptions has improved our understanding of magma storage conditions, but we still lack quantitative models. Here we use petrological data and thermodynamics to model magmatic gas content, deformation and SOâ?? emissions. We calculate the weight fraction of the exsolved volatile species using solubility laws and partitioning models to estimate the total gas mass fraction and the mass fraction of SOâ?? in the reservoir. The exsolved volatile phase increases magma compressibility, which decreases the reservoir volume change during eruption. We then perform sensitivity analyses to explore the effects of changing magmatic volatile content (Hâ??O, COâ??, S), oxygen fugacity and pre-eruptive exsolved volatile segregation (e.g., exsolved volatile accumulation at the reservoir roof, or the formation of a â??degassed plugâ??) on deformation and degassing of magmas. Our model shows that 1) magmatic Hâ??O content is the dominant control on compressibility and therefore ground deformation, 2) magmatic S content is the dominant control on SOâ?? flux, and 3) rhyolitic eruptions are likely to show less co-eruptive deformation than basaltic eruptions. Comparison to compilation of 25 eruptions shows that while shallow reservoir depths promote gas exsolution and thus suppress the volume changes, additional factors modulate this, namely magmatic Hâ??O content and pre-eruptive gas segregation. Catch up on past COMET and COMET+ webinars on our YouTube page: *https:/www.youtube.com/channel/UCtFDytX1hgjvlS4NH48M2oQ/video <https://urldefense.com/v3/__https://www.youtube.com/channel/UCtFDytX1hgjvlS4NH48M2oQ/videos__;!!IKRxdwAv5BmarQ!eXIWze1m9VzJY6r1XWTSPRi_aI8AfXRZSxI4tGGSb1J0xWboDalkd_WZiC3j4szKNxUJyg1L_kiQhcxCzYFWmh8gWw$> * Best wishes, Edna Dualeh, Milan Lazecky & Sophie Butcher COMET - Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics *https://comet.nerc.ac.uk/ <https://urldefense.com/v3/__https://comet.nerc.ac.uk/__;!!IKRxdwAv5BmarQ!eXIWze1m9VzJY6r1XWTSPRi_aI8AfXRZSxI4tGGSb1J0xWboDalkd_WZiC3j4szKNxUJyg1L_kiQhcxCzYEfAyFcrA$>* @NERC_COMET <https://urldefense.com/v3/__https://twitter.com/nerc_comet?lang=en__;!!IKRxdwAv5BmarQ!eXIWze1m9VzJY6r1XWTSPRi_aI8AfXRZSxI4tGGSb1J0xWboDalkd_WZiC3j4szKNxUJyg1L_kiQhcxCzYEUuvDylQ$> 5-5-5-5-5-5-5-5-5-5-5-5-5-5 ------------------------------
