2-2-2-2-2-2-2-2-2-2-2-2-2 From: "Deligne, Natalia I" <ndeligne@xxxxxxxx> We invite you to submit an abstract to our session "*Operational hazard forecasts: source parameters and model evaluation*" at the upcoming IAVCEI 2025 Scientific Assembly (29 June - 4 July, 2025). Our session is part of Theme 6. *Session Description:* Volcanic eruptions can last from minutes through decades, and produce hazards that can impact hundreds of square meters through to the entire globe. While an eruption is imminent and/or ongoing, there is a need to produce authoritative, timely, and accurate hazard forecasts for potentially affected areas. Operational forecasts follow an established protocol (generally specific to the responsible entity) for the generation and issuance of the forecast, using an identified numerical model(s). The model requires the input of event-specific parameters, such as vent location, mass eruption rate (effusion rate), eruption duration, and other parameters specific to the hazard. We welcome contributions on how initial model parameters are selected, how parameters are input and updated in near real time, and how operational model performance is evaluated and improved upon. We particularly invite contributions from volcano observatories, Volcanic Ash Advisory Centers, and others with mandates to generate and disseminate operational hazard forecasts. *This session is sponsored by the World Organization of Volcano Observatories (WOVO), the World Meteorological Organization Advisory Group on Volcanic Science for Aviation Applications (WMO AG-VSA), and the IAVCEI Commission on Tephra Hazard Modelling.* CONVENERS Natalia Deligne (U.S. Geological Survey â?? Hawaiian Volcano Observatory, Hilo, Hawaii, United States) Thomas Aubry (University of Exeter, Penryn, United Kingdom) Samantha Engwell (British Geological Survey â?? Edinburgh, Edinburgh, United Kingdom) Annalisa Cappello (Istituto Nazionale di Geofisica e Vulcanologia â?? Catania, Catania, Italy) *Abstract submission deadline: *20 December 2024, https://on-line-form.eu/iavcei2025sa/abstracts/index.php?coo=1 <https://urldefense.com/v3/__https://on-line-form.eu/iavcei2025sa/abstracts/index.php?coo=1__;!!IKRxdwAv5BmarQ!fjJz9D1Dz1q8nyvYsdI6dK-vW-mRYlpLArnRP87gyYpSrr7sUVISaquIolSb-JAGMyoA6Hst-plMqEFIgjz7T4yPTg$> *A corresponding author/presenter can submit a maximum of one abstract as an oral presentation and one as an additional poster presentation. (The corresponding author is the person who submits the abstract, and the presenting authors is expected to attend and present in person.)* 2-2-2-2-2-2-2-2-2-2-2-2-2 ------------------------------
