New perspectives on volcano monitoring in a tropical environment: continuous measurements of soil CO2 flux at Piton de la Fournaise (La Réunion Island, France)

Guillaume Boudoire 1, 2 Andrea Di Muro 2 Marco Liuzzo 3 Valérie Ferrazzini 2 Aline Peltier 2 Stefano Gurrieri 3 Laurent Michon 1 Gaetano Giudice 3 Philippe Kowalski 2 Patrice Boissier 2
1 LGSR - Laboratoire GéoSciences Réunion
2 OVPF - Observatoire Volcanologique du Piton de la Fournaise
3 INGV - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Palermo
Abstract : Detecting renewal of volcanic activity is a challenging task and even more difficult in tropical settings. Continuous measurements of soil CO2 flux were carried out at the Piton de la Fournaise volcano during 2013–2016. Since this site is in the tropics, periods of heavy rainfall are in the norm. Measurements covered volcanic unrest after a hiatus of 3.5 years. We find that while temperature has the strongest effect, extreme rainfall causes short-term noise. When corrected and filtered from the environmental influence, soil CO2 time series permit to detect a major deep magmatic event during March–April 2014, 3 months before the first eruption of the new activity phase. Correlation with geophysical data sets allows timing of further stages of upward fluid ascent. Our study validates soil CO2 flux monitoring in tropical environments as a valuable tool to monitor magma transfer and to enhance understanding of volcano unrest down to the lithospheric mantle.
Keywords : MultiGas Volcano seismicity Piton de la Fournaise GNSS Inversion modeling Magma transfer
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Guillaume Boudoire, Andrea Di Muro, Marco Liuzzo, Valérie Ferrazzini, Aline Peltier, et al.. New perspectives on volcano monitoring in a tropical environment: continuous measurements of soil CO2 flux at Piton de la Fournaise (La Réunion Island, France). Geophysical Research Letters, American Geophysical Union, 2017, 44 (16), pp.8244-8253. ⟨10.1002/2017GL074237⟩. ⟨hal-01574973⟩

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