Andrew J. L. Harris Julie Morin Andrea Bevilacqua Aline Peltier Willy Aspinall Stefano Ciolli Patrick Bachelery Benjamin Bernard Jonas Biren Antonio Brum da Silveira Valery Cayol Oryaelle Chevrel Diego Coppola Hannah R. Dietterich Amy Donovan Olaya Dorado Stephane Drenne Olivier Dupere Lucia Gurioli Stephan Kolzenburg Jean-Christophe Komorowski Philippe Labazuy Domenico Mangione Stefano Mannini Francois Martel-Asselin Etienne Medard Sophie Pailot-Bonnetat Victoria Rafflin Michael Ramsey Nicole Richter Silvia Vallejo-Vargas Nicolas Villeneuve Silvia Zafrilla Alessandro Tadini 2022 <p><span>Formalised elicitation of expert judgements has been used to help tackle several problematic societal&nbsp;issues, including volcanic crises and pandemic threats. We present an expert elicitation exercise for Piton de la&nbsp;Fournaise volcano, La Réunion island, held remotely in April 2021. This involved 28 experts from nine&nbsp;countries who considered a hypothetical effusive eruption crisis involving a new vent opening in a high-risk area.&nbsp;The tele-elicitation presented several challenges, but is a promising and workable option for application to future&nbsp;volcanic crises. Our exercise considered an “uncommon” eruptive scenario with a vent outside the present caldera&nbsp;and within inhabited areas, and provided uncertainty ranges for several hazard-related questions for such a scenario&nbsp;(e.g. probability of eruption within a defined timeframe; elapsed time until lava flow reaches a critical location, and&nbsp;other hazard management issues). Our exercise indicated that such a scenario would probably present very different&nbsp;characteristics compared to recent eruptions, and that it is fundamental to include well-prepared&nbsp;expert elicitations in updated civil protection evacuation plans to improve disaster response procedures.</span></p> application/pdf 10.30909/vol.05.01.105131 en Presses Universitaires de Strasbourg Structured elicitation of expert judgement in real-time eruption scenarios: An exercise for Piton de la Fournaise volcano, La Réunion island article