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New perspectives on volcano monitoring in a tropical environment: Continuous measurements of soil CO 2 flux at Piton de la Fournaise (La Réunion Island, France)
Author(s) -
Boudoire G.,
Di Muro A.,
Liuzzo M.,
Ferrazzini V.,
Peltier A.,
Gurrieri S.,
Michon L.,
Giudice G.,
Kowalski P.,
Boissier P.
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl074237
Subject(s) - volcano , unrest , geology , seismology , politics , political science , law
Detecting renewal of volcanic activity is a challenging task and even more difficult in tropical settings. Continuous measurements of soil CO 2 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 CO 2 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 CO 2 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.