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Authors: Rizzo, A. L.* 
Federico, C.* 
Inguaggiato, S.* 
Sollami, A.* 
Tantillo, M.* 
Vita, F.* 
Bellomo, S.* 
Longo, M.* 
Grassa, F.* 
Liuzzo, M.* 
Title: The 2014 effusive eruption at Stromboli volcano (Italy): Inferences from soil CO2 flux and 3He/4He ratio in thermal waters
Issue Date: 12-Apr-2015
Series/Report no.: /42 (2015)
DOI: 10.1002/2014GL062955
Keywords: Stromboli
soil CO2 flux
3He/4He ratio
thermal waters
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
Abstract: A new eruption started at Stromboli on August 6, 2014, which had been preceded by 2 months of increased Strombolian activity and several lava overflows from the craters. The eruption was characterized by a lava effusion in Sciara del Fuoco from a fracture at 650 m a.s.l. that lasted until November 13–17. Here we present the first geochemical observations of this eruption, based on the soil CO2 flux in the summit area, and on 3He/4He ratios in the thermal waters near Stromboli village. We infer that this eruption was triggered by the gradual replenishment of the feeding system by a CO2- and 3He-rich magma at the end of 2013 and after June 2014, suggested by the increase in 3He/4He ratio before eruption, which reached its highest value since 2007. We thus infer that this eruption was unusual and we finally speculate on the evolutionary scenario of post eruption.
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