The 2019 Eruptive Activity at Stromboli Volcano: A Multidisciplinary Approach to Reveal Hidden Features of the "Unexpected" 3 July Paroxysm

Mario Mattia, Bellina Di Lieto, Gaetana Ganci, Valentina Bruno, Pierdomenico Romano, Francesco Ciancitto, Prospero De Martino, Salvatore Gambino, Marco Aloisi, Mariangela Sciotto, Roberto Scarpa, Carmelo Ferlito
2021 Remote Sensing  
In July and August 2019, Stromboli volcano underwent two dangerous paroxysms previously considered "unexpected" because of the absence of significant changes in usually monitored parameters. We applied a multidisciplinary approach to search for signals able to indicate the possibility of larger explosive activity and to devise a model to explain the observed variations. We analysed geodetic data, satellite thermal data, images from remote cameras and seismic data in a timespan crossing the
more » ... ive period of 2019 to identify precursors of the two paroxysms on a medium-term time span (months) and to perform an in-depth analysis of the signals recorded on a short time scale (hours, minutes) before the paroxysm. We developed a model that explains the observations. We call the model "push and go" where the uppermost feeding system of Stromboli is made up of a lower section occupied by a low viscosity, low density magma that is largely composed of gases and a shallower section occupied by the accumulated melt. We hypothesize that the paroxysms are triggered when an overpressure in the lower section is built up; the explosion will occur at the very moment such overpressure overcomes the confining pressure of the highly viscous magma above it.
doi:10.3390/rs13204064 fatcat:4kqvbkxnwjf33oe6xiffd56gdm