A Sulfur Trigger for the 2017 Phreatomagmatic Eruption of Poás Volcano, Costa Rica? Insights from MultiGAS and Drone-based Gas Monitoring

Maarten J de Moor1, Alessandro Aiuppa2, Geoffroy Avard3, Jorge Andres Diaz4, Ernesto Corrales4, Julian Rüdiger5, Fiona D´Arcy6, Tobias P Fischer7, John Stix8 and Alfredo Alan9, (1)Observatorio Vulcanológico y Sismológico de Costa Rica, Heredia, Costa Rica, (2)National Institute of Geophysics and Volcanology, Palermo, Rome, Italy, (3)OVSICORI-UNA, Heredia, Costa Rica, (4)Gas Lab, CICANUM, Universidad de Costa Rica, San Jose, Costa Rica, (5)Johannes Gutenberg University of Mainz, Institute of Inorganic and Analytical Chemistry, Mainz, Germany, (6)McGill University, Montreal, Canada, (7)University of New Mexico, Department of Earth and Planetary Sciences, Albuquerque, NM, United States, (8)McGill University, Earth & Planetary Sciences, Montreal, QC, Canada, (9)Gaslab, CICANUM, University of Costa Rica, San José, Costa Rica